32周先悦等六甲基二硅氮烷镁催化丙交酯的开环聚合反应六甲基二硅氮烷镁催化丙交酯的开环聚合反应周先悦,孙洪广(青岛科技大学高分子科学与工程学院,山东青岛266042)摘要:聚丙交酯(PLA)作为一种可降解材料,其应用广泛。目前主要方法是通过丙交酯开环聚合来合成PLA。如何高效合成PLA的关键在于设计出一种高效的催化体系。该文设计出一种结构简单的六甲基二硅氮烷镁(Mg(HMDS)2)催化剂,可用于丙交酯的开环聚合,由Mg(HMDS)2与BnOH组成的催化体系不仅能使聚合反应转化率提高,而且聚合反应变得更加可控,单体聚合转化率均在90%以上。随着BnOH的量逐渐增加,显示出一种无终止聚合特征,并且反应可控性逐渐优化,所得聚合物分子量分布逐渐降低。随着反应聚合度的增加,分子量分布同样保持较低值,最小可达1.09。关键词:聚丙交酯;Mg(HMDS)2;开环聚合中图分类号:O631.5Mg(HMDS)2-CatalyzedRing-openingPolymerizationofLactideZHOUXian-yue,SUNHong-guang(SchoolofPolymerScienceandEngineering,QingdaoUniversityofScienceandTechnology,Qingdao266042,Shandong,China)Abstract:Polylactide(PLA)iswidelyusedasadegradablematerial.Atpresent,themainmethodistosynthesizepolylactidebyring-openingpolymerizationoflactide.Therefore,thekeyhowtosynthesizePLAefficientlyistodesignanefficientcatalyticsystem.Inthispaper,asimplehexamethyldisilazanemagnesium(Mg(HMDS)2)catalystisdesigned,whichcanbeusedforthering-openingpolymerizationoflactide.ThecatalyticsystemcomposedofMg(HMDS)2andbenzylalcoholcannotonlyimprovetheconversion,butalsogetmorecontrollable,andtheconversionismorethan90%.Withtheincreaseoftheamountofbenzylalcohol,itshowsanimmortalpolymerizationcharacteristic,andthecontrollabilityofthereactionisgraduallyoptimized,andthemolecularweightdistributionoftheobtainedpolymerisgraduallyreduced.Withtheincreaseofthedegreeofpolymerization,themolecularweightdistributionalsoremainslow,withaminimumof1.09.Keywords:poly(lacticacid);Mg(HMDS)2;ring-openingpolymerization无终止聚合的概念是由Inoue课题组在研究卟啉-铝/醇催化体系用于环氧化合物的开环聚合(ROP)时首次提出[1]。无终止聚合最显著的特点是反应快、活性种和质子化合物之间是可逆交换反应,合成的聚合物的分子量为单峰,分子量...