以乳酸为原料,辛酸亚锡为催化剂,采用梯度升温法,在168℃、0.098MPa下直接熔融缩聚生成端羧基聚乳酸共聚物P(LA/SA)、P(LA/CA)和P(LA/AC).用乌氏粘度法、FT-IR、1H-NMR、DSC、TGA及XRD等对共聚物进行了表征.结果表明和PLA相比,3种端羧基共聚物Tg均有不同程度的降低,说明端羧基的引入降低了聚乳酸的刚性;TGA结果表明各共聚物热稳定性提高为一步热分解过程;XRD分析得出P(LA/SA)和P(LA/AC)比PLA的结晶度有所升高,而P (LA/CA)的结晶度略微降低,说明可通过调节乳酸和改性剂的配比来调节材料的力学性能.
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