{"id":5412,"date":"2022-07-27T13:50:42","date_gmt":"2022-07-27T13:50:42","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5412"},"modified":"2022-07-27T13:51:28","modified_gmt":"2022-07-27T13:51:28","slug":"pet-nucleating-agents","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/pet-nucleating-agents\/","title":{"rendered":"Br\u00e8ve description des types d'agents nucl\u00e9ants pour le PET et de l'effet des agents nucl\u00e9ants sur les propri\u00e9t\u00e9s cristallines du PET"},"content":{"rendered":"<h1><strong>Br\u00e8ve description des types d'agents nucl\u00e9ants pour le PET et de l'effet des agents nucl\u00e9ants sur les propri\u00e9t\u00e9s cristallines du PET<\/strong><\/h1>\n<p>&nbsp;<\/p>\n<p>Il existe trois principaux types d'agents nucl\u00e9ants pour le PET, \u00e0 savoir les agents nucl\u00e9ants inorganiques, les agents nucl\u00e9ants organiques et les agents nucl\u00e9ants polym\u00e8res. Ce document d\u00e9crit bri\u00e8vement l'impact de ces agents nucl\u00e9ants sur les propri\u00e9t\u00e9s cristallines du PET.<\/p>\n<p>I. Agents nucl\u00e9ants inorganiques.<\/p>\n<p>Les agents nucl\u00e9ants inorganiques sont essentiellement des charges inorganiques couramment utilis\u00e9es dans les polym\u00e8res. Dans le processus de cristallisation, les agents nucl\u00e9ants inorganiques \u00e9quivalent \u00e0 la seconde phase de petites particules dans le PET fondu, \u00e0 des temp\u00e9ratures \u00e9lev\u00e9es, ces particules ne sont pas \u00e0 l'\u00e9tat fondu, dans le processus de refroidissement, la cha\u00eene mol\u00e9culaire du PET est centr\u00e9e sur ces particules, s'adsorbe sur les particules et cr\u00e9e un arrangement ordonn\u00e9 et la formation de noyaux. Ces petites mol\u00e9cules inorganiques, lorsqu'elles sont utilis\u00e9es comme agents nucl\u00e9ants h\u00e9t\u00e9rog\u00e8nes, r\u00e9duisent donc l'\u00e9nergie d'activation n\u00e9cessaire \u00e0 la formation de noyaux dans le PET et ont peu d'effet sur le processus de cristallisation ult\u00e9rieur, c'est-\u00e0-dire que les segments de la cha\u00eene mol\u00e9culaire du PET sont adsorb\u00e9s sur la surface du noyau et entrent dans le r\u00e9seau.<\/p>\n<p>Lorsque le talc est utilis\u00e9 comme agent nucl\u00e9ant dans le PET, la cristallisation initiale se forme \u00e0 la surface des particules de charge et s'accompagne d'un transfert de cristaux de la structure lamellaire par une petite diffusion lat\u00e9rale \u00e0 la surface des particules. L'effet des carbonates en tant qu'agents nucl\u00e9ants sur les propri\u00e9t\u00e9s cristallines du PET s'est av\u00e9r\u00e9 efficace en tant qu'agents nucl\u00e9ants cristallins pour le PET avec Na2CO3 et NaHCO3. Avec Na2CO3 ou NaHCO3 comme agents de nucl\u00e9ation, le PET peut \u00eatre produit avec de bonnes propri\u00e9t\u00e9s m\u00e9caniques dans un cycle de moulage relativement court \u00e0 90% de la temp\u00e9rature du moule. Les effets de nucl\u00e9ation du talc, du CaCO3 et des agents nucl\u00e9ants organiques \u00e0 base de sel de sodium ont \u00e9t\u00e9 compar\u00e9s et il a \u00e9t\u00e9 constat\u00e9 que le talc \u00e9tait plus favorable au taux de cristallisation du PET que le CaCO3. Lorsque la teneur en masse de talc est de 5%, la contribution au taux de cristallisation isotherme du PET est proche de la contribution du sel de sodium organique de 1%, et l'ajout de talc am\u00e9liore consid\u00e9rablement la r\u00e9sistance \u00e0 la traction et \u00e0 la flexion du PET, tandis que le sel de sodium organique r\u00e9duit ces propri\u00e9t\u00e9s.<\/p>\n<p>Deuxi\u00e8mement, les agents nucl\u00e9ants organiques.<\/p>\n<p>Les agents nucl\u00e9ants organiques sont principalement des sels de Na, Li, Ba, Mg, Ca d'acide monocarboxylique, des sels de Na, K, Ca d'acide benzylique, des hydroxysulfonates aromatiques, des sels de Mg, Zn de compos\u00e9s phosphor\u00e9s organiques, parmi lesquels le sel de sodium d'acide carboxylique et le sel de potassium d'acide carboxylique ont le meilleur effet. Le m\u00e9canisme de nucl\u00e9ation des agents nucl\u00e9ants organiques est principalement li\u00e9 \u00e0 leur structure chimique. Le PET et les sels de carboxylate de sodium subissent une r\u00e9action chimique lorsqu'ils sont extrud\u00e9s \u00e0 haute temp\u00e9rature, g\u00e9n\u00e9rant des substances PET-COONa, qui forment des groupes ioniques entre le PET fondu et les groupes terminaux ioniques.<\/p>\n<p>L'effet de l'ajout d'un agent nucl\u00e9ant d\u00e9riv\u00e9 du benzoate de sodium (Nu) et d'un promoteur de la cristallisation d'un copolym\u00e8re polyester poly\u00e9ther (Pro) sur le taux de cristallisation du PET. On a constat\u00e9 que le Nu\/Pro-PET cristallisait l\u00e9g\u00e8rement plus vite que le Nu-PET \u00e0 des temp\u00e9ratures de cristallisation de 228 \u00b0C et 230 \u00b0C ; toutefois, \u00e0 des temp\u00e9ratures de cristallisation plus \u00e9lev\u00e9es, le Nu\/Pro-PET cristallisait l\u00e9g\u00e8rement plus lentement que le Nu-PET, ce qui indique que l'acc\u00e9l\u00e9rateur de cristallisation n'augmentait pas davantage le taux de cristallisation du PET \u00e0 des temp\u00e9ratures plus \u00e9lev\u00e9es. L'ajout d'un agent nucl\u00e9ant \u00e0 base de benzoate de sodium a raccourci la p\u00e9riode d'induction de la cristallisation, r\u00e9duit l'\u00e9nergie d'activation de la cristallisation et augment\u00e9 le taux de cristallisation global du PET ; la variation s'est accrue avec l'augmentation de l'ajout, mais a r\u00e9duit la cristallinit\u00e9, ce qui n'a pas favoris\u00e9 la stabilit\u00e9 des propri\u00e9t\u00e9s du mat\u00e9riau m\u00e9lang\u00e9. Par cons\u00e9quent, lorsque le benzoate de sodium est utilis\u00e9 dans le PET, il faut faire attention au dosage et il est \u00e9galement n\u00e9cessaire de l'utiliser avec d'autres modificateurs.<\/p>\n<p>Troisi\u00e8mement, les agents de nucl\u00e9ation des polym\u00e8res.<\/p>\n<p>Les agents de nucl\u00e9ation des polym\u00e8res comprennent les sels alcalins zwitterioniques de polyester, la poudre de polyester enti\u00e8rement aromatique, la poudre de PTFE, le PP isotactique de faible poids mol\u00e9culaire, le PET \u00e0 point de fusion \u00e9lev\u00e9, l'ionom\u00e8re, le polym\u00e8re \u00e0 cristaux liquides (LCP), etc. La temp\u00e9rature de transition vitreuse du PET est r\u00e9duite par le m\u00e9lange, ce qui acc\u00e9l\u00e8re le taux de cristallisation et am\u00e9liore sa r\u00e9sistance aux chocs. Les ionom\u00e8res sont des polym\u00e8res comportant un petit nombre de groupes ionisables sur l'\u00e9pine dorsale du polym\u00e8re, les principaux composants \u00e9tant constitu\u00e9s d'une cha\u00eene dorsale non ionique et d'un petit nombre de composants contenant des ions. La teneur molaire en groupes ioniques est g\u00e9n\u00e9ralement consid\u00e9r\u00e9e comme ne d\u00e9passant pas 15%. Dans le syst\u00e8me de m\u00e9lange binaire des ionom\u00e8res, l'ionom\u00e8re peut interagir par l'interm\u00e9diaire d'ions, de dip\u00f4les d'ions, de liaisons hydrog\u00e8ne, d'acides et de bases, de transferts de charge, de complexes de coordination de m\u00e9taux de transition, etc. et de la r\u00e9ticulation physique de multiples paires d'ions ou d'amas d'ions form\u00e9s entre les cha\u00eenes de polym\u00e8res. Cette composition sp\u00e9ciale et la structure morphologique des ionom\u00e8res leur conf\u00e8rent de nombreuses propri\u00e9t\u00e9s uniques telles qu'une excellente t\u00e9nacit\u00e9, une r\u00e9sistance \u00e9lev\u00e9e aux chocs, une r\u00e9sistance \u00e0 l'usure, une transparence et une viscosit\u00e9 \u00e9lev\u00e9e \u00e0 l'\u00e9tat fondu. Le Surlyn est un ionom\u00e8re largement utilis\u00e9, d\u00e9velopp\u00e9 par DuPont en tant qu'agent nucl\u00e9ant du Surlyn, qui est un sel de sodium du copolym\u00e8re \u00e9thyl\u00e8ne-acide m\u00e9thacrylique, o\u00f9 le rapport pond\u00e9ral \u00e9thyl\u00e8ne\/acide m\u00e9thacrylique est de 90\/10 et la neutralisation du sodium est d'environ 45%. Les produits de la r\u00e9action peuvent former des amas ioniques \u00e0 terminaison ionique (PET-COONa), qui agissent comme des agents nucl\u00e9ants h\u00e9t\u00e9rog\u00e8nes dans le processus de cristallisation par refroidissement.<\/p>\n<p>Par rapport aux agents nucl\u00e9ants organiques \u00e0 petites mol\u00e9cules, l'agent nucl\u00e9ant polym\u00e8re Surlyn avec des groupes terminaux d'ions dans la g\u00e9n\u00e9ration de grandes mol\u00e9cules en m\u00eame temps, il y a PET-R (R pour agent nucl\u00e9ant organique groupe flexible) g\u00e9n\u00e9r\u00e9, parce que la cha\u00eene mol\u00e9culaire R que la cha\u00eene mol\u00e9culaire PET est plus flexible, dans le syst\u00e8me et jouer le r\u00f4le de facilitateur, son introduction pour promouvoir le mouvement mol\u00e9culaire du PET, r\u00e9duire l'\u00e9nergie libre de la diffusion de la cha\u00eene mol\u00e9culaire dans le caract\u00e8re, et aussi r\u00e9duire le carreau de PET, am\u00e9liorer le PET. Il r\u00e9duit \u00e9galement le carreau de PET et augmente le taux de cristallisation du PET, ce qui n'est pas le cas des agents nucl\u00e9ants \u00e0 petites mol\u00e9cules.<\/p>","protected":false},"excerpt":{"rendered":"<p>Br\u00e8ve description des types d'agents nucl\u00e9ants pour le PET et de l'effet des agents nucl\u00e9ants sur les propri\u00e9t\u00e9s cristallines du PET Il existe trois principaux types d'agents nucl\u00e9ants pour le PET, \u00e0 savoir les agents nucl\u00e9ants inorganiques, les agents nucl\u00e9ants organiques et les agents nucl\u00e9ants polym\u00e8res. Ce document d\u00e9crit bri\u00e8vement l'impact de ces agents nucl\u00e9ants sur les [...]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[106],"tags":[],"class_list":["post-5412","post","type-post","status-publish","format-standard","hentry","category-laboratory-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Brief description of the types of PET nucleating agents and the effect of nucleating agents on the crystalline properties of PET - Longchang Chemical<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/longchangchemical.com\/fr\/pet-nucleating-agents\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Brief description of the types of PET nucleating agents and the effect of nucleating agents on the crystalline properties of PET - Longchang Chemical\" \/>\n<meta property=\"og:description\" content=\"Brief description of the types of PET nucleating agents and the effect of nucleating agents on the crystalline properties of PET &nbsp; There are three main types of nucleating agents for PET, namely inorganic nucleating agents, organic nucleating agents and polymeric nucleating agents. 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