高分子化学浙江大学polymer2-1RadicalChainPolymerization.ppt

文档介绍：该【高分子化学浙江大学polymer2-1RadicalChainPolymerization 】是由【小可爱】上传分享，文档一共【44】页，该文档可以免费在线阅读，需要了解更多关于【高分子化学浙江大学polymer2-1RadicalChainPolymerization 】的内容，可以使用淘豆网的站内搜索功能，选择自己适合的文档，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此文档到您的设备，方便您编辑和打印。高分子化学浙江大学polymer2-1RadicalChainPolymerization*1ReactionsofRadicalPolymerization*ElementaryReactionsofRadicals1)Addition(加成)2)Transfer(转移)3)Coupling(偶合)4)Disproportionation(歧化)5)Fragmentation(分解)..*ReactionsofPolymerizationwhere Ri*isaactivespeciesofchainlengthi,I2istheinitiator(引发剂),Misthemonomer,Sisatransferagent(链转移剂),andPispolymerfast/slowfastfastslowEssenceofChainPolymerizationEachadditionreproducesthereactivegroup.(Trueforeverykindofchainpolymerization,notjustfreeradical.)R*=R?radicalpolymerizationR*=R-anionpolymerizationR*=R+*2MonomersforChainPolymerization*GeneralforAllChainPolymerizationsVinylpolymerizationsworkingeneralbecauseconvertingadoublebondintotwosinglebondsisexothermic(放热).Thermodynamicsics*However,inmorehighlysubstitutedsystems,rowdinginthepolymerchains,andthisdecreasesthedrivingforce.-(异裂)Homolysis(均裂).*