以L-乳酸为原料,通过熔融缩聚法制备了分子量较低的聚L-乳酸(PLLA),采用亚磷酸三苯酯(TPPi)为扩链剂对其扩链增粘,研究了TPPi用量和反应时间对产物分子量的影响,得到了AM-Uη为18.6万的高分子量PLLA,由13C-NMR和[α]25可证实其分子结构在扩链前后基本一致.DSC结果显示扩链后产物的熔点和结晶度与扩链前产物相近,TGA表明扩链后产物热稳定性增强.
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