以DMSO作为聚乳酸(PLLA)和明胶的共溶剂,采用浇铸法将PLLA与明胶混合在一起.X射线衍射结果表明PLLA用DMSO溶解后,在重新干燥的过程中,PLLA的堆积结构会发生变化,半结晶态的PLLA变成无定形态.使用固体13C CP/MAS NMR测定了原料PLLA以及不同比例的PLLA/明胶共混膜的弛豫时间,发现PLLAl00及所有共混膜的弛豫时间与原料PLLA相比,显著增加,分子运动加剧.进一步证明了PLLA在用DMSO处理后由半晶态转变成了无定形态,明胶的加入,不影响聚乳酸的结晶结构.
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