Abstract: Widespread application of PLA is limited because of its slow crystallization rate and low heat deflection temperature. The poly (lactic acid) (PLA) with wood flour (WF) and a small amount of multi amide compound (MA) were successfully prepared by melt blending. The crystallization kinetics, heat resistance and mechanical properties of PLA composites were studied. When the addition of wood flour was 30.0% and multi amide compound was 0.3%, DSC results show that the crystallization rate of isothermal and non⁃isothermal improved dramatically, and correspondingly the Vicatsofting point of PLA composites increases to 146.5 ℃, higher than that of neat PLA 61.6 ℃, the heat resistance of PLA is improved dramatically. Moreover, mechanical properties of the PLA composties are studied. The tensile strength of the PLA/WF and PLA/WF/MA samples is increased slightly. It is concluded that the combination of wood flour and the multi amide compound have a synergistic effect on PLA crystallization behavior to producehigh heat resistance PLA composites.

Key words: Poly(lactic acid), Wood flour, Multi amide compound, Crystallization behavior, Heat?resistance

摘要： 聚乳酸（PLA）的结晶性能较差，导致其产品的耐热性能较差，极大地限制了聚乳酸的应用范围。采用木粉（WF）与聚乳酸熔融共混，同时添加少量的成核剂多酰胺类化合物（MA），制备高耐热性聚乳酸/木粉复合材料。研究了木粉、成核剂以及两者同时添加对复合材料结晶性能、耐热性能以及力学性能的影响。结果表明，木粉和成核剂多酰胺类化合物的加入对聚乳酸具有协同成核的作用，添加质量分数为0.3%的多酰胺类化合物和质量分数为30.0%的木粉，聚乳酸的结晶速率大幅上升，复合材料的维卡软化点提高到146.5 ℃，远高于纯聚乳酸的维卡软化点61.6 ℃，有效地提高了聚乳酸的耐热性能。同时，聚乳酸复合材料的拉伸强度也略有提高。

关键词: 聚乳酸, 木粉, 多酰胺类化合物, 结晶性能, 耐热性