{"id":103349,"date":"2024-07-17T07:43:15","date_gmt":"2024-07-17T05:43:15","guid":{"rendered":"https:\/\/www.linseis.com\/sem-categoria\/politereftalato-de-etileno-pet-uma-investigacao-aprofundada\/"},"modified":"2026-01-12T09:44:31","modified_gmt":"2026-01-12T08:44:31","slug":"politereftalato-de-etileno-pet-uma-investigacao-aprofundada","status":"publish","type":"post","link":"https:\/\/www.linseis.com\/pt-pt\/conhecimentos\/politereftalato-de-etileno-pet-uma-investigacao-aprofundada\/","title":{"rendered":"Poli(tereftalato de etileno) (PET): Uma investiga\u00e7\u00e3o aprofundada"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"103349\" class=\"elementor elementor-103349 elementor-8388\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9eb8745 e-flex e-con-boxed e-con e-parent\" data-id=\"9eb8745\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-030ae6e elementor-toc--minimized-on-tablet elementor-invisible elementor-widget elementor-widget-table-of-contents\" data-id=\"030ae6e\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;headings_by_tags&quot;:[&quot;h2&quot;],&quot;exclude_headings_by_selector&quot;:[],&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;marker_view&quot;:&quot;numbers&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\t\u00cdndice\t\t\t<\/h4>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__030ae6e\" aria-expanded=\"true\" aria-label=\"Open table of 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9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__030ae6e\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8a9139e elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"8a9139e\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Cristalinidade do PET<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ffaef65 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"ffaef65\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>O poli(tereftalato de etileno<\/strong>), vulgarmente designado por <strong>PET<\/strong>, ocupa um lugar importante em numerosas produ\u00e7\u00f5es industriais e comerciais.<\/p><p>Este termopl\u00e1stico caracteriza-se por uma <a href=\"https:\/\/www.linseis.com\/pt-pt\/?p=103220\">\n  <strong>cristalinidade vari\u00e1vel<\/strong>\n<\/a>que determina em grande parte as suas propriedades carater\u00edsticas. Este pl\u00e1stico multifacetado pode passar de uma forma est\u00e1vel e s\u00f3lida para uma natureza flex\u00edvel e male\u00e1vel. <\/p><p>A flexibilidade das propriedades estruturais do <strong>PET<\/strong> permite-lhe ser utilizado numa vasta gama de categorias de produtos. Destaca-se a sua aplica\u00e7\u00e3o no fabrico de garrafas de bebidas, que utilizam a resist\u00eancia inerente e a natureza transl\u00facida do material. <\/p><p>Uma elevada propor\u00e7\u00e3o de estruturas cristalinas no <strong>PET<\/strong> confere a estas garrafas a robustez necess\u00e1ria para armazenar l\u00edquidos em seguran\u00e7a, ao mesmo tempo que o material permanece leve e f\u00e1cil de manusear na utiliza\u00e7\u00e3o quotidiana. Estas propriedades s\u00e3o cruciais para uma solu\u00e7\u00e3o de embalagem sustent\u00e1vel que cumpra os requisitos de integridade do produto e de conveni\u00eancia para o consumidor. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cb5c309 e-con-full e-flex e-con e-child\" data-id=\"cb5c309\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-8f88511 e-con-full e-flex e-con e-child\" data-id=\"8f88511\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-96556fa elementor-invisible elementor-widget elementor-widget-image\" data-id=\"96556fa\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/11-1024x576.png\" class=\"attachment-large size-large wp-image-34025\" alt=\"\" srcset=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/11-1024x576.png 1024w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/11-300x169.png 300w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/11-768x432.png 768w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/11.png 1140w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-97f0f26 e-con-full e-flex e-con e-child\" data-id=\"97f0f26\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-54dd63e elementor-invisible elementor-widget elementor-widget-image\" data-id=\"54dd63e\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/10-1024x576.png\" class=\"attachment-large size-large wp-image-34834\" alt=\"\" srcset=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/10-1024x576.png 1024w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/10-300x169.png 300w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/10-768x432.png 768w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/10.png 1140w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9bfc116 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"9bfc116\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Entalpia de fus\u00e3o do PET<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f3a894e elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"f3a894e\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>O <a href=\"https:\/\/www.linseis.com\/pt-pt\/?p=103232\">\n  <strong>ponto de fus\u00e3o<\/strong>\n<\/a> do <strong>PET<\/strong> situa-se geralmente entre 250\u00b0C e 260\u00b0C. Este ponto \u00e9 utilizado, por exemplo, na produ\u00e7\u00e3o de fibras t\u00eaxteis. <\/p><p>Os t\u00eaxteis feitos de <strong>PET<\/strong> s\u00e3o particularmente populares devido ao seu baixo peso e elevada resist\u00eancia ao rasgamento. A estrutura fina e a durabilidade do <strong>PET<\/strong> ajudam a produzir pe\u00e7as de vestu\u00e1rio que s\u00e3o respir\u00e1veis e duradouras. <\/p><p>Para determinar <strong>o ponto de fus\u00e3o<\/strong>, utiliza normalmente um <a href=\"https:\/\/www.linseis.com\/methoden\/dynamische-differenz-kalorimetrie\/\"><strong>din\u00e2mico<\/strong> <strong>calor\u00edmetro diferencial din\u00e2mico<\/strong><\/a>conhecido como <strong>DSC<\/strong>.<\/p><p>Para a quantifica\u00e7\u00e3o exacta da <strong>cristalinidade<\/strong> e da <a href=\"https:\/\/www.linseis.com\/messgroessen\/enthalpie\/\">\n  <strong>entalpia de fus\u00e3o<\/strong>\n<\/a> \u00e9 utilizado o <strong>chip DSC<\/strong> especializado e patenteado.<\/p><p>A temperaturas pr\u00f3ximas do seu <strong>ponto de fus\u00e3o<\/strong> de cerca de 255\u00b0C, <strong>os granulados de PET<\/strong> s\u00e3o extrudidos em fibras, que s\u00e3o depois fiadas em fios. \u00c9 de salientar que, embora tanto os granulados como as fibras resultantes tenham o mesmo <strong>ponto de fus\u00e3o<\/strong>, as fibras t\u00eaxteis adquirem as suas propriedades \u00fanicas atrav\u00e9s do processo de extrus\u00e3o e fia\u00e7\u00e3o. <\/p><p>Ap\u00f3s o processo de fia\u00e7\u00e3o, estas fibras atingem um elevado grau de dureza e resist\u00eancia. Isto permite a produ\u00e7\u00e3o de t\u00eaxteis resistentes, mas leves, como o vestu\u00e1rio desportivo, que \u00e9 respir\u00e1vel e resistente \u00e0s tens\u00f5es e aos esfor\u00e7os de uma atividade f\u00edsica intensa. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1e7d97c e-con-full e-flex e-con e-child\" data-id=\"1e7d97c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-e53ff6a e-con-full e-flex e-con e-child\" data-id=\"e53ff6a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3c88d58 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"3c88d58\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/12-1024x576.png\" class=\"attachment-large size-large wp-image-34037\" alt=\"\" srcset=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/12-1024x576.png 1024w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/12-300x169.png 300w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/12-768x432.png 768w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/12.png 1140w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5871a10 e-con-full e-flex e-con e-child\" data-id=\"5871a10\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-17612ce elementor-invisible elementor-widget elementor-widget-image\" data-id=\"17612ce\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/13-1024x576.png\" class=\"attachment-large size-large wp-image-34838\" alt=\"\" srcset=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/13-1024x576.png 1024w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/13-300x169.png 300w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/13-768x432.png 768w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/13.png 1140w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-227b6c4 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"227b6c4\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Diversidade e coer\u00eancia do PET<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3112811 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"3112811\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>O PET<\/strong> tem uma pontua\u00e7\u00e3o elevada gra\u00e7as \u00e0 sua diversidade e durabilidade. As propriedades mec\u00e2nicas e \u00f3pticas do produto final podem ser optimizadas atrav\u00e9s do ajuste fino dos par\u00e2metros de processamento. <\/p><p>A sua versatilidade permite a produ\u00e7\u00e3o de diversos produtos, desde estruturas robustas a estruturas flex\u00edveis.<br>Um exemplo disto s\u00e3o as <strong>pel\u00edculas PET<\/strong>: estas s\u00e3o resistentes ao stress f\u00edsico e a v\u00e1rias influ\u00eancias ambientais, raz\u00e3o pela qual s\u00e3o frequentemente utilizadas em embalagens ou como protectores de ecr\u00e3.<\/p><p>A sua resist\u00eancia e durabilidade fazem deles uma solu\u00e7\u00e3o econ\u00f3mica e de alta qualidade.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f5b9810 e-con-full e-flex e-con e-child\" data-id=\"f5b9810\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-9d4761a e-con-full e-flex e-con e-child\" data-id=\"9d4761a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cd7a0d4 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"cd7a0d4\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/9-1024x576.png\" class=\"attachment-large size-large wp-image-34041\" alt=\"\" srcset=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/9-1024x576.png 1024w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/9-300x169.png 300w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/9-768x432.png 768w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/9.png 1140w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f891ff5 e-con-full e-flex e-con e-child\" data-id=\"f891ff5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8d95817 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"8d95817\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/14-1024x576.png\" class=\"attachment-large size-large wp-image-34842\" alt=\"\" srcset=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/14-1024x576.png 1024w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/14-300x169.png 300w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/14-768x432.png 768w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/14.png 1140w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c85ce21 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"c85ce21\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Estabilidade t\u00e9rmica e temperatura de transi\u00e7\u00e3o v\u00edtrea do PET<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-224c225 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"224c225\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>O <a href=\"https:\/\/www.linseis.com\/pt-pt\/?p=103241\"><strong>estabilidade t\u00e9rmica<\/strong> <strong>estabilidade t\u00e9rmica<\/strong><\/a> do <strong>PET<\/strong> permite-lhe ser utilizado em numerosos produtos. <strong>As pel\u00edculas PET<\/strong>, por exemplo, mant\u00eam a sua forma e transpar\u00eancia a diferentes temperaturas. Isto torna-o uma escolha ideal para embalagens, especialmente para alimentos. <\/p><p>Gra\u00e7as a esta resist\u00eancia \u00e0 temperatura, <strong>as pel\u00edculas PET<\/strong> podem ser utilizadas tanto em c\u00e2maras frigor\u00edficas como em ambientes quentes sem perderem a transpar\u00eancia ou encolherem. Caracterizam-se igualmente pela sua resist\u00eancia qu\u00edmica, pelo que n\u00e3o reagem com os alimentos embalados nem provocam altera\u00e7\u00f5es indesej\u00e1veis de sabor ou odor. <\/p><p>Gra\u00e7as \u00e0 sua <strong>estabilidade<\/strong> <strong>t\u00e9rmica<\/strong>, <strong>as pel\u00edculas PET<\/strong> s\u00e3o tamb\u00e9m utilizadas em aplica\u00e7\u00f5es t\u00e9cnicas. Por exemplo, na ind\u00fastria eletr\u00f3nica, onde s\u00e3o utilizadas como materiais isolantes ou como substratos para circuitos flex\u00edveis. A sua capacidade de resistir a altas temperaturas sem se deformar torna-as particularmente valiosas para estas aplica\u00e7\u00f5es cr\u00edticas.  <\/p><p>Na ind\u00fastria autom\u00f3vel, <strong>as pel\u00edculas PET<\/strong> s\u00e3o utilizadas como pel\u00edculas para janelas devido \u00e0s suas excelentes propriedades t\u00e9rmicas e resist\u00eancia aos raios UV. Protegem os ocupantes da radia\u00e7\u00e3o UV nociva e, ao mesmo tempo, reduzem a temperatura interior, o que, por sua vez, reduz a necessidade de ar condicionado, optimizando assim o consumo de combust\u00edvel. <\/p><p>Por \u00faltimo, <strong>as pel\u00edculas PET<\/strong> s\u00e3o tamb\u00e9m muito procuradas na tecnologia solar. Neste caso, s\u00e3o utilizadas como pel\u00edculas protectoras e de cobertura para m\u00f3dulos fotovoltaicos, protegendo as c\u00e9lulas solares das intemp\u00e9ries e permitindo a passagem eficaz da luz solar. <\/p><p>A <strong>temperatura de transi\u00e7\u00e3o v\u00edtrea<\/strong> do <strong>PET<\/strong> situa-se normalmente entre 70\u00b0C e 80\u00b0C, o que significa que se mant\u00e9m est\u00e1vel numa vasta gama de temperaturas.<\/p><p>Um bom exemplo disto s\u00e3o as <strong>pel\u00edculas de embalagem PET<\/strong>, que podem suportar diferen\u00e7as de temperatura sem se tornarem fr\u00e1geis ou perderem a sua flexibilidade. <strong>O Chip DSC<\/strong> tamb\u00e9m permite determinar com precis\u00e3o a temperatura em que ocorre a transi\u00e7\u00e3o v\u00edtrea. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-716d24e e-con-full e-flex e-con e-child\" data-id=\"716d24e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-a9d25b9 e-con-full e-flex e-con e-child\" data-id=\"a9d25b9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-db4dbc0 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"db4dbc0\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/17-1024x576.png\" class=\"attachment-large size-large wp-image-34045\" alt=\"\" srcset=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/17-1024x576.png 1024w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/17-300x169.png 300w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/17-768x432.png 768w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/17.png 1140w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a0d70da e-con-full e-flex e-con e-child\" data-id=\"a0d70da\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-62a8403 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"62a8403\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/15-1024x576.png\" class=\"attachment-large size-large wp-image-34846\" alt=\"\" srcset=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/15-1024x576.png 1024w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/15-300x169.png 300w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/15-768x432.png 768w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/15.png 1140w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e315f33 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"e315f33\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Diferentes tipos de PET<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-26b9ead elementor-widget__width-initial elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"26b9ead\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>No que respeita aos diferentes tipos de <strong>PET<\/strong>, as diferen\u00e7as de <strong>cristalinidade<\/strong> e de aditivos conduzem a produtos com propriedades f\u00edsicas diversas.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6d2a6b0 elementor-widget__width-initial elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"6d2a6b0\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"text-decoration: underline;\">Por exemplo:<\/span><\/p><ul><li><strong>Garrafas:<\/strong> Muitas vezes feitas de PET cristalino, que \u00e9 conhecido pela sua transpar\u00eancia e resist\u00eancia.<\/li><li><strong>Componentes electr\u00f3nicos:<\/strong> PET amorfo, que ganha pontos pela sua estabilidade dimensional e propriedades de isolamento el\u00e9trico.<\/li><li>Vestu\u00e1rio <strong>desportivo:<\/strong> PET el\u00e1stico, que \u00e9 frequentemente utilizado para vestu\u00e1rio respir\u00e1vel e robusto.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9fbf0b6 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"9fbf0b6\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Aplica\u00e7\u00e3o<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-408c60a elementor-widget__width-initial elementor-invisible elementor-widget elementor-widget-image\" data-id=\"408c60a\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"550\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Chip-DSC-PET-Sample-2-1024x704.png\" class=\"attachment-large size-large wp-image-36646\" alt=\"\" srcset=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Chip-DSC-PET-Sample-2-1024x704.png 1024w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Chip-DSC-PET-Sample-2-300x206.png 300w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Chip-DSC-PET-Sample-2-768x528.png 768w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Chip-DSC-PET-Sample-2-1536x1056.png 1536w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Chip-DSC-PET-Sample-2-2048x1408.png 2048w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Ap. N.\u00ba 02-011-002 Chip-DSC 10 - Pol\u00edmeros - PET <\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-af91780 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"af91780\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Por exemplo, um granulado <strong>de PET<\/strong> <strong>(poli(tereftalato de etileno))<\/strong> foi aquecido, arrefecido para congelar o estado amorfo e depois analisado utilizando <strong>um chip DSC<\/strong> com uma taxa de aquecimento linear de 50 K\/min.<\/p><p>A curva resultante mostra uma transi\u00e7\u00e3o v\u00edtrea significativa a cerca de 80 \u00b0C, seguida de uma cristaliza\u00e7\u00e3o a frio das partes amorfas a partir de cerca de 148 \u00b0C e um pico de fus\u00e3o a 230 \u00b0C.<br>O <strong>grau de cristalinidade<\/strong> pode ser determinado a partir da <strong>entalpia<\/strong> do pico de cristaliza\u00e7\u00e3o a frio em compara\u00e7\u00e3o com a entalpia do <strong>PET<\/strong> cristalino puro.<\/p><p>Dependendo da hist\u00f3ria t\u00e9rmica da amostra, o <strong>grau de cristalinidade<\/strong> muda e pode, portanto, ser usado como um indicador da hist\u00f3ria e do comportamento mec\u00e2nico do pol\u00edmero.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d240cb5 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"d240cb5\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Conclus\u00e3o<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-27d0ae9 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"27d0ae9\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Globalmente, <strong>o PET<\/strong> demonstra uma diversidade impressionante devido \u00e0 sua <strong>cristalinidade<\/strong> vari\u00e1vel, <strong>estabilidade<\/strong> <strong>t\u00e9rmica<\/strong> e <strong>temperaturas<\/strong> espec\u00edficas <strong>de fus\u00e3o e<\/strong> <strong>de transi\u00e7\u00e3o v\u00edtrea<\/strong>.<\/p><p>\u00c9 um elemento essencial em muitos sectores e ser\u00e1 emocionante ver as futuras inova\u00e7\u00f5es e aplica\u00e7\u00f5es do <strong>PET<\/strong> no mundo dos pl\u00e1sticos.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6336c86 elementor-widget elementor-widget-spacer\" data-id=\"6336c86\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-77223dd e-flex e-con-boxed e-con e-parent\" data-id=\"77223dd\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>O poli(tereftalato de etileno), vulgarmente designado por PET, ocupa um lugar importante em numerosas produ\u00e7\u00f5es industriais e comerciais.<\/p>\n","protected":false},"author":3,"featured_media":33206,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[654],"tags":[],"class_list":["post-103349","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-conhecimentos"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/posts\/103349","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/comments?post=103349"}],"version-history":[{"count":0,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/posts\/103349\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/media\/33206"}],"wp:attachment":[{"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/media?parent=103349"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/categories?post=103349"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/tags?post=103349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}