{"id":1005,"date":"2024-02-04T13:59:33","date_gmt":"2024-02-04T05:59:33","guid":{"rendered":"https:\/\/www.joyforce.com\/?p=1005"},"modified":"2024-02-05T13:26:34","modified_gmt":"2024-02-05T05:26:34","slug":"mechanism-of-polyvinyl-alcohol-formation","status":"publish","type":"post","link":"https:\/\/www.joyforce.com\/fr\/blogs\/mechanism-of-polyvinyl-alcohol-formation.html","title":{"rendered":"M\u00e9canisme de formation de l'alcool polyvinylique"},"content":{"rendered":"<p style=\"font-weight: 400;\">Le PVA est unique parmi les polym\u00e8res (compos\u00e9s de grandes mol\u00e9cules \u00e0 plusieurs unit\u00e9s) car il n'est pas form\u00e9 par la polym\u00e9risation de mol\u00e9cules pr\u00e9curseurs \u00e0 unit\u00e9 unique appel\u00e9es monom\u00e8res. En revanche, l'alcool polyvinylique est fabriqu\u00e9 en dissolvant un autre polym\u00e8re, l'ac\u00e9tate de polyvinyle (PVAc), dans un alcool tel que le m\u00e9thanol et en le traitant avec un catalyseur alcalin tel que l'hydroxyde de sodium. La r\u00e9action d'hydrolyse ou d'\"alcoolyse\" qui en r\u00e9sulte \u00e9limine le groupe ac\u00e9tate de la mol\u00e9cule d'ac\u00e9tate de polyvinyle sans d\u00e9truire la structure \u00e0 longue cha\u00eene de la mol\u00e9cule d'ac\u00e9tate de polyvinyle. Structure chimique de l'unit\u00e9 r\u00e9p\u00e9titive d'alcool vinylique obtenue<\/p>\n<p style=\"font-weight: 400;\">Lorsque la r\u00e9action est termin\u00e9e, le produit est soluble dans l'eau et pratiquement insoluble dans tous les solvants organiques. L'\u00e9limination incompl\u00e8te des groupes ac\u00e9tates rend la r\u00e9sine moins soluble dans l'eau et plus soluble dans certains liquides organiques.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-1006\" src=\"https:\/\/www.joyforce.com\/wp-content\/uploads\/2024\/02\/1-11.png\" alt=\"\" width=\"666\" height=\"447\" srcset=\"https:\/\/www.joyforce.com\/wp-content\/uploads\/2024\/02\/1-11.png 666w, https:\/\/www.joyforce.com\/wp-content\/uploads\/2024\/02\/1-11-300x201.png 300w, https:\/\/www.joyforce.com\/wp-content\/uploads\/2024\/02\/1-11-18x12.png 18w, https:\/\/www.joyforce.com\/wp-content\/uploads\/2024\/02\/1-11-600x403.png 600w\" sizes=\"(max-width: 666px) 100vw, 666px\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>Le PVA est unique parmi les polym\u00e8res (compos\u00e9s de grandes mol\u00e9cules \u00e0 plusieurs unit\u00e9s) car il n'est pas form\u00e9 par la polym\u00e9risation de mol\u00e9cules pr\u00e9curseurs \u00e0 unit\u00e9 unique appel\u00e9es monom\u00e8res. En revanche, l'alcool polyvinylique est fabriqu\u00e9 en dissolvant un autre polym\u00e8re, l'ac\u00e9tate de polyvinyle (PVAc), dans un alcool tel que le m\u00e9thanol et en le traitant avec un catalyseur alcalin tel que l'hydroxyde de sodium. [...]<\/p>","protected":false},"author":1,"featured_media":1006,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[43],"tags":[],"class_list":["post-1005","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Mechanism of polyvinyl alcohol formation - JOYFORCE INDUSTRIAL<\/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:\/\/www.joyforce.com\/fr\/blogs\/mechanism-of-polyvinyl-alcohol-formation.html\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mechanism of polyvinyl alcohol formation - JOYFORCE INDUSTRIAL\" \/>\n<meta property=\"og:description\" content=\"PVA is unique among polymers (compounds composed of large, multi-unit molecules) because it is not formed by the polymerization of single-unit precursor molecules called monomers. In contrast, polyvinyl alcohol is made by dissolving another polymer, polyvinyl acetate (PVAc), in an alcohol such as methanol and treating it with an alkaline catalyst such as sodium hydroxide. 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