{"id":6457,"date":"2021-11-03T12:42:27","date_gmt":"2021-11-03T11:42:27","guid":{"rendered":"https:\/\/www.3pcorporate.com\/\/materiaux\/pi\/"},"modified":"2022-02-23T16:50:11","modified_gmt":"2022-02-23T15:50:11","slug":"pi","status":"publish","type":"page","link":"https:\/\/www.3pcorporate.com\/fr\/materiaux\/pi\/","title":{"rendered":"PI"},"content":{"rendered":"

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Le mat\u00e9riau polyimide est le meilleur plastique pour des temp\u00e9ratures de fonctionnement \u00e9lev\u00e9es<\/h1><\/div>

Le polyimide est une grande famille de plastiques hautes performances offrant une r\u00e9sistance \u00e0 tr\u00e8s haute temp\u00e9rature et une tr\u00e8s grande stabilit\u00e9 thermique. Il offre \u00e9galement une bonne r\u00e9sistance aux radiations.<\/p>\n<\/div><\/div><\/div><\/div><\/div>

Les thermoplastiques polyimide sont d\u00e9di\u00e9s aux temp\u00e9ratures extr\u00eames<\/h2><\/div>
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Le polyimide regroupe une large gamme de polym\u00e8res \u00e0 base de monom\u00e8res imide. La r\u00e9sistance \u00e0 tr\u00e8s haute temp\u00e9rature et la stabilit\u00e9 thermique sont des propri\u00e9t\u00e9s typiques de la famille des polyimides. Les polyimides sont \u00e9galement naturellement r\u00e9sistants \u00e0 la combustion.<\/p>\n

La famille des polyimides a fortement \u00e9volu\u00e9 depuis ses d\u00e9buts. Alors que la production industrielle existe depuis 1955, le polyimide a d’abord exist\u00e9 sous forme de polym\u00e8res thermodurcissables, qui se d\u00e9gradent avant de fondre. Dans les ann\u00e9es 80, un nouveau polyimide thermoplastique a \u00e9t\u00e9 d\u00e9velopp\u00e9, conduisant notamment \u00e0 la production de PEI (poly\u00e9therimide) et de PAI (polyamideimide), avec des temp\u00e9ratures de fonctionnement maximales respectives de 170\u00b0C et 200\u00b0C. Le PEI reste rigide \u00e0 des temp\u00e9ratures \u00e9lev\u00e9es et offre une r\u00e9sistance \u00e9lev\u00e9e au fluage.<\/p>\n

En s\u00e9lectionnant les bons grades parmi les mat\u00e9riaux polyimide, on peut atteindre l’une des meilleures temp\u00e9ratures de fonctionnement disponibles, jusqu’\u00e0 400\u00b0C. Certains grades peuvent m\u00eame atteindre l’une des temp\u00e9ratures de fonctionnement les plus basses pour les plastiques, avec -240\u00b0C.<\/p>\n<\/div>\n

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Le mat\u00e9riau polyimide est le meilleur plastique pour des temp\u00e9ratures de fonctionnement \u00e9lev\u00e9es<\/p><\/div>\n<\/div>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div>

PI et PEI sont transform\u00e9s sous toutes sortes de formes<\/h2><\/div>
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Comme ils sont difficiles \u00e0 transformer en raison de leur point de fusion \u00e9lev\u00e9, le polyimide et le poly\u00e9therimide sont les plus souvent utilis\u00e9s \u00e0 partir de produits semi-finis. Ces tiges, tubes plaques sont ensuite facilement usin\u00e9s. Gr\u00e2ce \u00e0 leur grande stabilit\u00e9 thermique, les PI et PEI sont souvent utilis\u00e9s en usinage de haute pr\u00e9cision, pour des applications n\u00e9cessitant des tol\u00e9rances r\u00e9duites.<\/p>\n

Le polyimide et le poly\u00e9therimide sont \u00e9galement transform\u00e9s par moulage par injection, comme la plupart des autres thermoplastiques. Cela permet d\u2019acc\u00e9der \u00e0 une large gamme de pi\u00e8ces complexes mais n\u00e9cessite un \u00e9quipement d\u00e9di\u00e9 pour r\u00e9sister aux temp\u00e9ratures demand\u00e9es.<\/p>\n

Les films polyimide, \u00e9galement connus sous le nom de film Kapton\u00ae<\/sup> (marque d\u00e9pos\u00e9e par DuPont de Nemours) sont \u00e9galement couramment utilis\u00e9s dans l’industrie.<\/p>\n<\/div>\n

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    Propri\u00e9t\u00e9s du polyimide<\/h2><\/div>
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    Propri\u00e9t\u00e9s m\u00e9caniques<\/p>\n
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    • Stabilit\u00e9 thermique exceptionnelle, avec une tr\u00e8s faible dilatation thermique<\/li>\n
    • Haute r\u00e9sistance et rigidit\u00e9<\/li>\n
    • Haute r\u00e9sistance \u00e0 l’usure<\/li>\n
    • Excellente r\u00e9sistance aux chocs<\/li>\n
    • Bon coefficient de frottement<\/li>\n
    • Propri\u00e9t\u00e9s chimiques<\/li>\n
    • Bonne r\u00e9sistance chimique, aux hydrocarbures, alcools et solvants halog\u00e9n\u00e9s ; sensible aux attaques alcalines et acides<\/li>\n
    • Tr\u00e8s bonne r\u00e9sistance aux radiations, avec de nombreuses applications dans l\u2019industrie du nucl\u00e9aire<\/li>\n
    • Faible absorption d’humidit\u00e9 et de vapeur selon le grade PI<\/li>\n<\/ul>\n

      Propri\u00e9t\u00e9s \u00e9lectriques<\/p>\n

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      • bonnes propri\u00e9t\u00e9s di\u00e9lectriques<\/li>\n
      • Transparence \u00e0 la lumi\u00e8re visible, \u00e0 la lumi\u00e8re infrarouge et au rayonnement micro-ondes, selon la qualit\u00e9 du polym\u00e8re<\/li>\n<\/ul>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div>

        Compounds \u00e0 base de polyimide<\/h2><\/div>
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        Les polyimides sont souvent utilis\u00e9s avec des fibres de verre ou des fibres de carbone. Ces compos\u00e9s standards offrent des propri\u00e9t\u00e9s m\u00e9caniques ou \u00e9lectromagn\u00e9tiques \u00e9lev\u00e9es, m\u00eame \u00e0 haute temp\u00e9rature. Par exemple, le renforcement du PEI avec de la fibre de verre renforce la r\u00e9sistance \u00e0 la traction et la rigidit\u00e9, tout en am\u00e9liorant \u00e9galement la stabilit\u00e9 dimensionnelle.<\/p>\n

        Des compounds standard ou personnalis\u00e9s peuvent \u00eatre requis pour des applications exigeantes.<\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":6402,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"100-width.php","meta":{"footnotes":""},"class_list":["post-6457","page","type-page","status-publish","hentry"],"yoast_head":"\nPI - 3P Corporate<\/title>\n<meta name=\"description\" content=\"Le polyimide est une grande famille de plastiques hautes performances offrant une r\u00e9sistance \u00e0 tr\u00e8s haute temp\u00e9rature et une tr\u00e8s grande...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.3pcorporate.com\/fr\/materiaux\/pi\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PI\" \/>\n<meta property=\"og:description\" content=\"Le polyimide est une grande famille de plastiques hautes performances offrant une r\u00e9sistance \u00e0 tr\u00e8s haute temp\u00e9rature et une tr\u00e8s grande...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.3pcorporate.com\/fr\/materiaux\/pi\/\" \/>\n<meta property=\"og:site_name\" content=\"3P Corporate\" \/>\n<meta property=\"article:modified_time\" content=\"2022-02-23T15:50:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.3pcorporate.com\/\/wp-content\/uploads\/2021\/10\/X250_PEI_Polyetherimide-1.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"17 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.3pcorporate.com\\\/fr\\\/materiaux\\\/pi\\\/\",\"url\":\"https:\\\/\\\/www.3pcorporate.com\\\/fr\\\/materiaux\\\/pi\\\/\",\"name\":\"PI - 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