复合催化剂对聚乳酸熔融/固相聚合的影响  

Influences of Complex Catalytic System on the Synthesis of Poly(lactic acid)through Melt-solid Polycondensation

作　　者：吴启凡[1] 杨友斌[1] 孙正谦 郑红娟[1] 

机构地区：[1]河南工业大学材料科学与工程学院,郑州450001

出　　处：《高分子通报》2016年第3期69-76,共8页Polymer Bulletin

基　　金：国家自然科学基金资助(21404032);郑州市科技厅局自然科学项目(20140771);河南省骨干教师资助项目(2014GGJS-062);河南工业大学校基金项目(2014JCYJ13)

摘　　要：使用氯化亚锡/对甲苯磺酸(SnCl2/TSA)复合催化剂对聚乳酸熔融/固相聚合进行研究,通过使用乌氏粘度法,傅里叶变换红外光谱分析、差示扫描量热法对聚乳酸产品进行表征及分析。结果表明:聚乳酸熔融聚合过程中,使用的复合催化剂总含量为0.6%(wt)(SnCl_2和TSA分别为0.3%(wt)),能获得较高分子量的聚乳酸低聚物。使用单一组分0.5wt%的SnCl_2作催化剂,以熔融聚合获得的低聚物为原料进行固相聚合后,获得的聚乳酸粘均分子量是熔融聚合的3.7倍,且其相对分子量能达到最大值。Lactic acid was catalyzed by the complex catalytic system of SnCl2 and TSA to study the influence on the Synthesis of PLA through Melt-solid Polycondensation, and the products of the polymer were characterized by Ubbelohde viscosity average molecular, Fourier Transform infrared spectroscopy and Differential scanning calorimeter method. The results show that： The high molecular weight of PLA oligomer could be obtained, when the total content of composite catalyst is 0.6%（wt） （SnC12 and TSA all were 0.3% （wt））. When solid polymerization was carried out with a single component catalyst of 0.5%（wt） SnCl2 ,the viscosity average molecular weight of the solid phase were increased to 3.7 times as compared with the melt polymerization, the molecular of PLA,which synthesize by solid polymerization, can reach the maximum value as well.

关 键 词：聚乳酸 熔融聚合 固相聚合 SnCl2 TSA 

分 类 号：TQ316.33[化学工程—高聚物工业]