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橡塑技术与装备
            HINA R&P  TECHNOLOGY  AND EQUIPMENT



                 对乳酸锌催化 GA 熔融缩聚制备 PGA 的聚合温                     经过高温聚合合成聚乙醇酸,优化条件为 :乙醇酸的
             度进行优化。保持聚合时间不变的情况下,研究聚合                           聚合温度为 175  ℃,以乳酸锌为催化剂,其用量为
             温 度(165~185  ℃) 对 PGA 的热稳定性的影响,确                  乙醇酸质量的 0.8% 的条件下,粗聚乙醇酸的收率为
             定该反应体系的最优聚合温度。如图 5 所示,在一定                         50.5%,两次洗涤后收率为 49.5%。
             的乳酸锌催化作用下(含量 : 0.8%),当酯化温度为
             165 ℃、 175 ℃、 180 ℃时, PGA 的热稳定性相差不大。              参考文献 :
                                                               [1]   喻祖圣 . 辛酸亚锡引发的乙交酯开环聚合研究 [D]. 上海 :华
             当酯化温度为 170  ℃、185  ℃时,PGA 的热稳定性明
                                                                   东理工大学,2018.
             显下降。                                              [2]   BUDAK K,SOGUT O,SEZER U A.A review on synthesis
                                                                   and biomedical applications  of  polyglycolic  acid[J].
                                                                   Journal of Polymer Research ,2020,27(8):208.
             3 结论
                                                               [3]   于德梅,曹有名 . 可吸收性聚合物聚乙醇酸 [J]. 化工新型材料,
                (1)聚合温度是影响聚乙醇酸收率的一个重要因
                                                                   1996,24(1):17-18.
             素,选择一个合适的聚合温度,可以有效地抑制样品                           [4]   YAMANE  K,SATO  H,ICHIKAWA Y,et  al.Development
                                                                   of  an industrial production  technology for  high-molecu-
             含有较多分子量较低的产物以及因聚合温度较高而融
                                                                   lar -w eight polyglycolic   acid [ J ] .P olymer   J ournal ,
             化导致分子量过低的现象 ;并通过在反应后期提高真
                                                                   2014,46(11):769-775.
             空度,抽走反应体系中的水,使反应继续进行,提高                           [5]   Thomes D K,Thomes  T A.J Appl Polym Sci,1960, 3:129-
             聚乙醇酸的收率。                                              131.
                (2)乙醇酸水溶液经过脱水排除大部分水分,再





                        Synthesis and characterization of low molecular weight
                                                  polyglycolic acid

                                            Xu Yunxiang, Chen Jie, Wang Xuanlun*

                (College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054,
                                                          China )

                 Abstract: This study synthesized polyglycolic acid (PGA) at different polymerization temperatures and
             explored the effects of polymerization temperature on its intrinsic viscosity, melting temperature, and thermal
             stability. The results showed that the synthesized PGA exhibited the best comprehensive performance when
             the polymerization temperature was 175 ℃ . If the polymerization temperature was too low, the sample might
             contain more low molecular weight products; whereas if the temperature was too high, the polymer would easily
             melt, leading to a decrease in molecular weight. Therefore,  175  ℃ is considered as an ideal polymerization te

             mperature, and PGA synthesized under this condition has the highest molecular weight.
                 Key words: polyglycolic acid; intrinsic viscosity; polymerization temperature; low molecular weight
                                                                                                         (R-03)
















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