固体超强酸催化PLA-PEG嵌段共聚物的合成  

Synthesis of PLA-PEG block polymer catalyzed by solid super acid

作　　者：刘文明[1] 夏璐[1] 杨惠[1] 黄小强[1] 李凤仪[1] 

机构地区：[1]南昌大学应用化学研究所,江西南昌330031

出　　处：《应用化工》2010年第12期1838-1842,共5页Applied Chemical Industry

基　　金：江西省科技厅科技支撑计划资助项目(2007ZD01900);江西省教育厅科研基金资助项目(GJJ09039)

摘　　要：采用开环聚合法,固体超强酸SO42-/ZrO2-CeO2为催化剂,催化丙交酯和聚乙二醇合成PLA-PEG嵌段共聚物,研究了聚乙二醇(PEG)分子量、反应时间、温度、催化剂用量等条件对共聚物的影响,并通过红外光谱、Hammett指示剂法及NH3-TPD等方法对固体超强酸的酸性质进行了表征。结果表明,当焙烧温度为650℃时,得到的固体超强酸SO24-/ZrO2-CeO2酸强度与酸量最大,用该催化剂催化合成PLA-PEG嵌段共聚物,当PEG分子量为6 000,反应时间9 h、反应温度170℃,催化剂用量为丙交酯质量分数的1.0%时,得到PLA-PEG共聚物的特性粘数最大,为1.693 g/dL。The PLA-PEG block polymer catalyzed by solid super acid SO2-4/ZrO2-CeO2 was prepared by opening ring polymerization.The acidic property was measured by IR spectra,Hammett indicator and NH3-TPD techniques.The effects of molecular weight of PEG,reaction time,temperature and catalyst amount on copolymer were studied,and the characteristic group of copolymer was measured by FTIR spectra.The solid super acid SO2-4/ZrO2-CeO2 had the strongest acid strength and maximal acid content roasted at 650 ℃.The optimum reaction conditions were as follows：the amount of catalyst was 1.0% of lactic,the molecular weight of PEG was 6 000,polymerization at 170 ℃ for 9 h.The intrinsic viscosity reached 1.693g/dL.

关 键 词：固体超强酸 PLA-PEG嵌段共聚物 聚乳酸 Hammett指示剂 NH3-TPD 

分 类 号：O643.32[理学—物理化学]