{"id":704097,"date":"2024-09-30T13:22:01","date_gmt":"2024-09-30T12:22:01","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=704097"},"modified":"2024-09-30T13:22:01","modified_gmt":"2024-09-30T12:22:01","slug":"su-on-dinh-nhiet-cua-cac-loai-polymer","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/su-on-dinh-nhiet-cua-cac-loai-polymer\/","title":{"rendered":"S\u1ef1 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t c\u1ee7a c\u00e1c lo\u1ea1i polymer"},"content":{"rendered":"<p class=\"sidekick\">S\u1ef1 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t c\u1ee7a c\u00e1c lo\u1ea1i polymer: T\u00ecm hi\u1ec3u c\u00e1ch c\u00e1c polymer kh\u00e1c nhau duy tr\u00ec t\u00ednh ch\u1ea5t khi ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao, \u1ee9ng d\u1ee5ng trong c\u00f4ng nghi\u1ec7p v\u00e0 cu\u1ed9c s\u1ed1ng.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/su_on_dinh_nhiet_cua_cac_loai_polymer.png\" alt=\"S\u1ef1 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t c\u1ee7a c\u00e1c lo\u1ea1i polymer\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>S\u1ef1 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t c\u1ee7a c\u00e1c lo\u1ea1i polymer<\/h2>\n<p>S\u1ef1 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t c\u1ee7a c\u00e1c lo\u1ea1i polymer l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng quy\u1ebft \u0111\u1ecbnh \u0111\u1ebfn ph\u1ea1m vi \u1ee9ng d\u1ee5ng v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a ch\u00fang trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t kh\u00e1c nhau. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u v\u1ec1 s\u1ef1 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t c\u1ee7a c\u00e1c lo\u1ea1i polymer c\u0169ng nh\u01b0 c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00ednh ch\u1ea5t n\u00e0y.<\/p>\n<h2>Polymer v\u00e0 s\u1ef1 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t<\/h2>\n<p>Polymer l\u00e0 c\u00e1c h\u1ee3p ch\u1ea5t ch\u1ee9a c\u00e1c chu\u1ed7i d\u00e0i g\u1ed3m c\u00e1c \u0111\u01a1n v\u1ecb l\u1eb7p l\u1ea1i. T\u00ednh ch\u1ea5t c\u1ee7a polymer ph\u1ee5 thu\u1ed9c v\u00e0o c\u1ea5u tr\u00fac ph\u00e2n t\u1eed v\u00e0 c\u00e1ch s\u1eafp x\u1ebfp c\u00e1c \u0111\u01a1n v\u1ecb l\u1eb7p n\u00e0y. Trong c\u00e1c \u1ee9ng d\u1ee5ng nhi\u1ec7t, \u0111\u1ed9 b\u1ec1n nhi\u1ec7t c\u1ee7a polymer quy\u1ebft \u0111\u1ecbnh li\u1ec7u ch\u00fang c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u1ef1ng \u0111\u01b0\u1ee3c c\u00e1c nhi\u1ec7t \u0111\u1ed9 cao m\u00e0 kh\u00f4ng b\u1ecb ph\u00e2n h\u1ee7y hay m\u1ea5t \u0111i c\u00e1c t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc.<\/p>\n<h2>C\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t<\/h2>\n<ul>\n<li><strong>C\u1ea5u tr\u00fac ph\u00e2n t\u1eed:<\/strong> C\u1ea5u tr\u00fac ph\u00e2n t\u1eed c\u1ee7a polymer, bao g\u1ed3m m\u1ea1ch ch\u00ednh, c\u00e1c nh\u00f3m ch\u1ee9c n\u0103ng v\u00e0 m\u1ee9c \u0111\u1ed9 li\u00ean k\u1ebft ngang, \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t. V\u00ed d\u1ee5, c\u00e1c polymer c\u00f3 li\u00ean k\u1ebft ngang m\u1ea1nh h\u01a1n th\u01b0\u1eddng c\u00f3 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t cao h\u01a1n.<\/li>\n<li><strong>Kh\u1ed1i l\u01b0\u1ee3ng ph\u00e2n t\u1eed:<\/strong> Kh\u1ed1i l\u01b0\u1ee3ng ph\u00e2n t\u1eed \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 nh\u1edbt v\u00e0 nhi\u1ec7t \u0111\u1ed9 ch\u1ea3y c\u1ee7a polymer. Polyme c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ph\u00e2n t\u1eed l\u1edbn th\u01b0\u1eddng c\u00f3 nhi\u1ec7t \u0111\u1ed9 ch\u1ea3y cao v\u00e0 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t h\u01a1n.<\/li>\n<li><strong>B\u1ea3n ch\u1ea5t c\u1ee7a \u0111\u01a1n v\u1ecb l\u1eb7p:<\/strong> C\u00e1c nh\u00f3m ch\u1ee9c n\u0103ng v\u00e0 lo\u1ea1i \u0111\u01a1n v\u1ecb l\u1eb7p \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 ph\u00e2n h\u1ee7y nhi\u1ec7t c\u1ee7a polyme. Ch\u1eb3ng h\u1ea1n, c\u00e1c \u0111\u01a1n v\u1ecb l\u1eb7p ch\u1ee9a c\u00e1c nh\u00f3m phenyl c\u00f3 th\u1ec3 t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t do li\u00ean k\u1ebft \u03c0-\u03c0.<\/li>\n<\/ul>\n<h2>Qu\u00e1 tr\u00ecnh ph\u00e2n h\u1ee7y nhi\u1ec7t c\u1ee7a polymer<\/h2>\n<p>Polymer c\u00f3 th\u1ec3 tr\u1ea3i qua qu\u00e1 tr\u00ecnh ph\u00e2n h\u1ee7y nhi\u1ec7t khi ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao. C\u00e1c qu\u00e1 tr\u00ecnh ph\u00e2n h\u1ee7y n\u00e0y th\u01b0\u1eddng bao g\u1ed3m:<\/p>\n<ol>\n<li><strong>Ph\u00e2n h\u1ee7y g\u1ed1c t\u1ef1 do:<\/strong> Qu\u00e1 tr\u00ecnh n\u00e0y b\u1eaft \u0111\u1ea7u khi polyme b\u1ecb ph\u00e1 v\u1ee1 th\u00e0nh c\u00e1c g\u1ed1c t\u1ef1 do, sau \u0111\u00f3 ti\u1ebfp t\u1ee5c ph\u00e2n h\u1ee7y nhanh ch\u00f3ng.<\/li>\n<li><strong>Ph\u00e2n h\u1ee7y do oxi h\u00f3a:<\/strong> X\u1ea3y ra khi polymer ti\u1ebfp x\u00fac v\u1edbi kh\u00ed oxy \u1edf nhi\u1ec7t \u0111\u1ed9 cao, t\u1ea1o ra c\u00e1c s\u1ea3n ph\u1ea9m ph\u00e2n h\u1ee7y nh\u01b0 CO<sub>2<\/sub> v\u00e0 n\u01b0\u1edbc.<\/li>\n<li><strong>Ph\u00e2n h\u1ee7y do th\u1ee7y ph\u00e2n:<\/strong> X\u1ea3y ra khi c\u00e1c li\u00ean k\u1ebft este ho\u1eb7c amide trong polymer b\u1ecb ph\u00e2n gi\u1ea3i b\u1edfi n\u01b0\u1edbc \u1edf nhi\u1ec7t \u0111\u1ed9 cao.<\/li>\n<\/ol>\n<p>M\u1ed7i lo\u1ea1i polymer c\u00f3 m\u1ed9t nhi\u1ec7t \u0111\u1ed9 ph\u00e2n h\u1ee7y \u0111\u1eb7c tr\u01b0ng, th\u1ec3 hi\u1ec7n nhi\u1ec7t \u0111\u1ed9 \u1edf \u0111\u00f3 polymer b\u1eaft \u0111\u1ea7u thay \u0111\u1ed5i c\u1ea5u tr\u00fac m\u1ed9t c\u00e1ch kh\u00f4ng h\u1ed3i ph\u1ee5c.<\/p>\n<h2>C\u00e1c lo\u1ea1i polymer c\u00f3 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t cao<\/h2>\n<p>M\u1ed9t s\u1ed1 lo\u1ea1i polymer \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t t\u1ed1t h\u01a1n so v\u1edbi c\u00e1c lo\u1ea1i kh\u00e1c, bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>Polyimides:<\/strong> \u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng trong ng\u00e0nh h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 do \u0111\u1ed9 b\u1ec1n nhi\u1ec7t cao c\u1ee7a ch\u00fang.<\/li>\n<li><strong>Polyether ether ketone (PEEK):<\/strong> C\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t l\u00ean \u0111\u1ebfn 250\u00b0C m\u00e0 kh\u00f4ng b\u1ecb ph\u00e2n h\u1ee7y.<\/li>\n<li><strong>Polysulfone:<\/strong> \u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng c\u1ea7n \u0111\u1ed9 b\u1ec1n nhi\u1ec7t v\u00e0 h\u00f3a h\u1ecdc cao.<\/li>\n<\/ul>\n<h2>\u1ee8ng d\u1ee5ng<\/h2>\n<p>Nh\u1edd \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t cao, c\u00e1c lo\u1ea1i polymer n\u00e0y \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau. Ch\u1eb3ng h\u1ea1n:<\/p>\n<ul>\n<li><strong>Ng\u00e0nh h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5:<\/strong> S\u1eed d\u1ee5ng polyimides cho c\u00e1c b\u1ed9 ph\u1eadn c\u1ea7n \u0111\u1ed9 b\u1ec1n nhi\u1ec7t cao trong kh\u00f4ng gian.<\/li>\n<li><strong>Ng\u00e0nh y t\u1ebf:<\/strong> S\u1eed d\u1ee5ng PEEK cho c\u00e1c thi\u1ebft b\u1ecb y t\u1ebf c\u1ea7n ti\u1ec7t tr\u00f9ng \u1edf nhi\u1ec7t \u0111\u1ed9 cao.<\/li>\n<li><strong>Ng\u00e0nh \u0111i\u1ec7n t\u1eed:<\/strong> S\u1eed d\u1ee5ng polysulfone cho c\u00e1c b\u1ea3ng m\u1ea1ch v\u00e0 c\u00e1c thi\u1ebft b\u1ecb c\u1ea7n ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh \u1edf nhi\u1ec7t \u0111\u1ed9 cao.<\/li>\n<\/ul>\n<p>T\u00f3m l\u1ea1i, s\u1ef1 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t c\u1ee7a polymer l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u00ednh n\u0103ng v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a ch\u00fang trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t kh\u00e1c nhau. Hi\u1ec3u r\u00f5 c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 b\u1ec1n nhi\u1ec7t c\u1ee7a polymer s\u1ebd gi\u00fap ch\u00fang ta ch\u1ecdn l\u1ef1a v\u00e0 ph\u00e1t tri\u1ec3n c\u00e1c lo\u1ea1i polymer ph\u00f9 h\u1ee3p nh\u1ea5t cho t\u1eebng \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>S\u1ef1 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t c\u1ee7a c\u00e1c lo\u1ea1i polymer: T\u00ecm hi\u1ec3u c\u00e1ch c\u00e1c polymer kh\u00e1c nhau duy tr\u00ec t\u00ednh ch\u1ea5t khi ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao, \u1ee9ng d\u1ee5ng trong c\u00f4ng nghi\u1ec7p v\u00e0 cu\u1ed9c s\u1ed1ng.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>S\u1ef1 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