{"id":103241,"date":"2024-07-22T08:45:59","date_gmt":"2024-07-22T06:45:59","guid":{"rendered":"https:\/\/www.linseis.com\/sem-categoria\/medicao-da-estabilidade-termica\/"},"modified":"2026-01-12T09:40:26","modified_gmt":"2026-01-12T08:40:26","slug":"medicao-da-estabilidade-termica","status":"publish","type":"post","link":"https:\/\/www.linseis.com\/pt-pt\/conhecimentos\/medicao-da-estabilidade-termica\/","title":{"rendered":"Medi\u00e7\u00e3o da estabilidade t\u00e9rmica"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"103241\" class=\"elementor elementor-103241 elementor-14658\" 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-27e7523 elementor-toc--minimized-on-tablet elementor-invisible elementor-widget elementor-widget-table-of-contents\" data-id=\"27e7523\" 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__27e7523\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__27e7523\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 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__27e7523\" 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\">O que \u00e9 a estabilidade t\u00e9rmica?\n<\/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>Um pl\u00e1stico \u00e9 <strong>termicamente<\/strong> est\u00e1vel se n\u00e3o se decompuser sob a influ\u00eancia da temperatura. O oposto de termoestabilidade \u00e9 a termolabilidade. <br><br>Quando as subst\u00e2ncias org\u00e2nicas ou os pl\u00e1sticos s\u00e3o expostos ao calor, \u00e0 luz e, sobretudo, ao oxig\u00e9nio atmosf\u00e9rico durante um longo per\u00edodo de tempo, ocorre o chamado <strong>processo de envelhecimento<\/strong>. Este processo afecta n\u00e3o s\u00f3 as propriedades qu\u00edmicas, mas tamb\u00e9m as propriedades f\u00edsicas de um material. Nota-o da seguinte forma: Por um lado, trata-se de uma oxida\u00e7\u00e3o lenta de componentes individuais, por outro lado, algumas mol\u00e9culas n\u00e3o s\u00e3o est\u00e1veis a longo prazo e decomp\u00f5em-se ap\u00f3s um per\u00edodo de tempo desconhecido.  <\/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-eac9a92 elementor-widget__width-initial elementor-invisible elementor-widget elementor-widget-image\" data-id=\"eac9a92\" 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\/Thermische-Stabilitaet-Infografik-1024x576.png\" class=\"attachment-large size-large wp-image-33516\" alt=\"\" srcset=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Thermische-Stabilitaet-Infografik-1024x576.png 1024w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Thermische-Stabilitaet-Infografik-300x169.png 300w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Thermische-Stabilitaet-Infografik-768x432.png 768w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Thermische-Stabilitaet-Infografik-1536x864.png 1536w, https:\/\/www.linseis.com\/wp-content\/uploads\/2024\/07\/Thermische-Stabilitaet-Infografik.png 1920w\" 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 class=\"elementor-element elementor-element-0f74b29 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"0f74b29\" 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\">An\u00e1lise da estabilidade t\u00e9rmica com o teste OIT\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-33229bc elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"33229bc\" 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>Para analisar a durabilidade t\u00e9rmica de tais compostos, o &#8220;<a href=\"https:\/\/www.linseis.com\/wissen\/oxidationsinduktionszeit-und-temperatur\/\">\n  <strong>ensaio OIT<\/strong>\n<\/a>&#8220;, em que OIT significa<strong> &#8220;Oxidation Induction Time&#8221; (tempo de indu\u00e7\u00e3o de oxida\u00e7\u00e3o<\/strong> ). Neste ensaio, a amostra a ser analisada \u00e9 levada a uma temperatura abaixo do ponto de fus\u00e3o numa atmosfera inerte. <\/p><p>A atmosfera \u00e9 ent\u00e3o alterada para oxig\u00e9nio ou ar e o <a href=\"https:\/\/www.linseis.com\/startseite\/methoden\/dynamische-differenz-kalorimetrie\/\">\n  <strong>sinal calorim\u00e9trico<\/strong>\n<\/a>. Ap\u00f3s algum tempo, inicia-se a oxida\u00e7\u00e3o, que normalmente se manifesta como uma <a href=\"https:\/\/www.linseis.com\/wissen\/endotherme-vs-exotherme-reaktionen\/\">\n  <strong>rea\u00e7\u00e3o exot\u00e9rmica<\/strong>\n<\/a> e a temperatura da amostra aumenta ligeiramente. <\/p><p>O tempo de rea\u00e7\u00e3o correspondente pode ser lido a partir deste pequeno aumento, o que d\u00e1 o tempo de OIT. Uma declara\u00e7\u00e3o sobre a taxa de rea\u00e7\u00e3o e a taxa de decomposi\u00e7\u00e3o da oxida\u00e7\u00e3o incipiente tamb\u00e9m pode ser feita utilizando o DSC se os dados forem analisados com o software correspondente <a href=\"https:\/\/www.linseis.com\/messgeraete\/waermeleitfaehigkeit\/linseis-ta-evaluation-software\/\">\n  <strong>software<\/strong>\n<\/a> analisado. <\/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-9886ca6 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"9886ca6\" 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\">Que norma se aplica \u00e0 medi\u00e7\u00e3o da termoestabilidade?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ca73f52 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"ca73f52\" 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<ul><li><a href=\"https:\/\/www.astm.org\/e2550-21.html\" target=\"_blank\" rel=\"noopener\"><strong>Norma ASTM E2550 &#8211; 17 (M\u00e9todo de ensaio normalizado para a estabilidade t\u00e9rmica por termogravimetria)<\/strong><\/a><\/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-7e598f0 elementor-widget elementor-widget-spacer\" data-id=\"7e598f0\" 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\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Um pl\u00e1stico \u00e9 termicamente est\u00e1vel se n\u00e3o se decompuser sob a influ\u00eancia da temperatura. O oposto de termoestabilidade \u00e9 a termolabilidade. <\/p>\n","protected":false},"author":3,"featured_media":33512,"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-103241","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\/103241","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=103241"}],"version-history":[{"count":0,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/posts\/103241\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/media\/33512"}],"wp:attachment":[{"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/media?parent=103241"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/categories?post=103241"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/tags?post=103241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}