【摘要】 以乙醇酸为原料,在催化剂氯化亚锡质量分数0.5％,反应温度165℃,反应压力70 Pa,反应时间10 h的条件下进行熔融聚合,直接合成了生物降解的医用纤维材料聚乙醇酸(PGA),用IR,DSC,X射线衍射等进行了表征,并与乙交酯开环聚合二步法合成PGA进行了比较。直接熔融聚合PGA的结晶度和微晶尺寸高于二步法,其合成工艺流程短、简单易行、耗时少,有利于降低医用纤维材料PGA的开发成本。更多还原

【Abstract】 Starting from glycolic acid, polyglycollic acid (PGA) , a biodegradable material for medical fiber, can be synthesized via direct melt polymerization for 10 h in presence of 0. 5% SnCl2 catalyst at 165℃ and 70 Pa. PGA was characterized by IR, DSC and X-ray diffractometry. As compared with two-step synthesis method of ring opening polymerization from glycollide, PGA via direct melt polymerization had higher crystallinity and crystallite size. The direct melt polymerization had the advantages of short process, simple operation and time saving, which can reduce the production cost of PGA.更多还原