中文摘要：

将改性纳米黏土I.34TCN与聚乳酸（PLA）经过二次熔融混合制备了PLA/I.34TCN纳米复合材料。TEM表征结果显示，较高的黏土剥离程度提高了黏土在PLA中的分散性，使两相之间的界面作用力增强，同时可以使两相之间具有较大的界面增塑区；DSC表征结果显示，剥离型纳米黏土对纳米复合材料起到了结晶成核剂的作用，提高了纳米复合材料的结晶度。上述两方面的原因综合改善了纳米复合材料的力学性能，当黏土质量分数为2%时，PLA/I.34TCN纳米复合材料中黏土的剥离程度最高，使得该纳米复合材料的断裂伸长率显著提高，最多可提高101.00%，是纯PLA的18倍。TG表征结果发现，纳米复合材料的热稳定性能随I.34TCN含量的增加而逐渐增加。

英文摘要：

Polylactic acid(PLA)/clay nanocomposites were prepared by secondary melt blending of modifiednanometer clay and PLA.The TEM showed that the higher exfoliation could improve the dispersity of clay inPLA,thereby enhance the interfacial force between the two phases,and make the phase interface equipped withhighly interfacial plasticization region.The DSC showed that the exfoliated clay played a role as nucleating agent innanocomposites and increased the crystalline of the nanocomposites.The mechanical properties of nanocompositeswere improved owing to the above two reasons.When the mass fraction of clay was2%,the exfoliation degree of clayin PLA/I.34TCN nanocomposites reached the highest,and the elongation at break of nanocomposites was significantlyincreased by up to101.00%,which was18times that of pure PLA.The TG showed that the thermal stability of thenanocomposites increased with the increasing in the content of I.34TCN.