论文部分内容阅读
以L-乳酸为原料,采用分步除水、丙交酯回流、优选催化剂等工艺,通过熔融缩聚法制备了高分子量聚L-乳酸(PLLA),研究了脱水产物、反应装置、催化剂、聚合工艺等对产物分子量、产率及色泽的影响,并对产物分子结构进行了表征。在加装丙交酯回流装置后,以Sn(Ot)2/SnC l2.2H2O/TSA为催化剂,在170℃,反应12h所得PLLA黏均分子量(Mη)可达10.6万,产率为76%。
Using L-lactic acid as raw material, high molecular weight poly (L-lactic acid) (PLLA) was prepared by melt polycondensation using stepwise water removal, lactide refluxing and catalyst optimization. The effects of dehydration product, reaction equipment, catalyst, Process on the product molecular weight, yield and color, and the molecular structure of the product were characterized. After the lactide reflow device was installed, the viscosity average molecular weight (Mη) of PLLA obtained by reaction of Sn (Ot) 2 / SnCl22H2O / TSA at 170 ℃ for 12h was 106,000, the yield was 76% .