作 者：
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机构地区：
中山大学化学与化学工程学院
出 处：
《高分子学报》
2011年第11期1231-1236,共6页
摘 要：
为研究脂肪叔胺结构对内酯开环聚合规律的影响,以三乙胺(TEA)、N,N,N',N'-四甲基乙二胺(TMEDA)、N,N,N',N″,N″-五甲基二亚乙基三胺(PMDTA)3种不同结构的叔胺催化碳酸三亚甲基酯(TMC)和左旋丙交酯(L-LA)开环聚合.结果显示,在55℃的THF溶液中,以苄醇为引发剂,3种叔胺均能催化TMC和L-LA的开环聚合,聚合物的分子量与单体转化率成线性关系,表现出活性聚合特征.三者催化能力为TEA
In order to study the structure and the catalytic activity of aliphatic tertiary amines,the ring-opening polymerizations of trimethylene carbonate（TMC） and L-lactide（L-LA） were catalyzed by aliphatic tertiary amines,including triethylamine（TEA）,N,N,N′,N′-tetramethylethylenediamine（TMEDA）,1,1,4,7,7-pentamethyldiethylenetriamine（PMDTA） and 4-（dimethylamino）pyridine（DMAP）,using benzyl alcohol as initiator in THF at 55℃.Studies revealed the catalytic activity of these tertiary amines was increased according to the order：TEA TMEDA≈PMDTA DMAP.The relationships of polymer molecular weight with the conversion of monomer were linear,which were consistent with a living polymerization character.Finally,the plausible polymerization pathway was through an alcohol-activating mechanism.Aliphatic tertiary amines which were abundant in source and cheap in price were suitable for catalyzing the ring-opening bulk polymerization of lactone in low temperature because of their low boiling point,being liquid under ordinary conditions and being easy to get rid of.
关 键 词：
脂肪族叔胺
碳酸三亚甲基酯
丙交酯
开环聚合
领 域：
[理学]
[理学]
