悬浮聚合法制备聚乙醇酸的工艺

利用悬浮聚合的方法，选用甲基硅油作为体系的分散介质，MOA-3作为分散剂，乙醇酸为单体，辛酸亚锡为催化剂，合成出了特性黏度高达0.845 dL/g的聚乙醇酸（PGA），采用红外、核磁、DSC、XRD等方法表征了聚乙醇酸的结构和性质。通过一系列单因素实验探讨了聚合温度、反应时间、催化剂用量等对聚乙醇酸特性黏度的影响规律。经过正交实验得出各因素对特性黏度影响的大小，并得出最佳的制备工艺为：温度194 ℃，反应时间113 h，催化剂用量0.02%。

Research on the suspension polymerization of polyglycolic acid

Ploy(glycolic acid) (PGA) with a relatively high molecular weight of 0.845 dL?g?1 was prepared by suspension polymerization with methyl silicon as a disperse medium， glycolic acid as monomer，MOA-3 as dispersing agent，and Stannous octoate as catalyst. The structure and properties of the PGA were analyzed by NMR，IR，DSC，etc. The influence of synthesis conditions on inherent viscosity was tested by a series of single factor experiments. Orthogonal test was set to explore the influence of several factors and optimal process condition was obtained as follows: reaction temperature 194 ℃，reaction time 113 h，amount of catalyst 0.02%.