从乳酸出发,在乳酸脱水结束后、缩聚开始之前将蒙脱土和催化剂一起加入反应体系,通过原位熔融直接缩聚法制得较高分子量聚乳酸/蒙脱土纳米复合材料.XRD和TEM结果表明:蒙脱土(MMT)添加量为0.5%(质量分数,下同)时制得剥离型纳米复合材料,添加量为1%时产物剥离与插层结构并存.力学性能研究表明:MMT含量为0.5%和1%时,聚乳酸(PLA)的强度和韧性有明显提高,MMT含量进一步增加,力学性能下降.SEM对断裂面的观察显示出,MMT含量为0.5%时,PLA是韧性断裂特征.
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