摘要:采用密炼机熔融共混制备PLA复合材料，选用碳酸钙、滑石粉和KH550改性的滑石粉为无机粒子填充剂。研究了PLA/无机填料共混物的力学性能、断面微观结构、耐热性能以及结晶性能。结果表明：无机粒子降低了复合材料的拉伸强度。相较于CaCO3和滑石粉，滑石粉/KH-550在PLA基体中的分散更加均匀。PLA的耐热性能及结晶性能随着CaCO3、滑石粉和滑石粉/KH-550含量的增加而增加。扫面电镜分析表明用KH-550改性滑石粉可以有效改善滑石粉在PLA基体中的分散，并提高了滑石粉与PLA基体的界面亲和力，从而改善两者的相容性。

关键词：聚乳酸(PLA)；碳酸钙；滑石粉(Ta)；KH-550；熔融共混

Abstract：A series of PLA composites material were prepared by mixer melt blending. The calcium carbonate, talcum (Ta) and KH-550 modification of Ta were used as filling. The mechanical properties, the microscopic structure of the cross section, heat resistance and crystallization properties of PLA/inorganic particle composites were respectively studied. The results showed that the tensile strength of the composites reduced with inorganic particle. Compared with CaCO3 and Ta, Ta/KH-550 in PLA matrix was dispersed more uniform. The heat resistance and crystallization properties of PLA were increasing with the increase of inorganic particle. SEM results showed that the dispersion of Ta in the PLA matrix was effectively improved by KH-550 modified Ta, at the same time the interface affinity of the talc and the PLA matrix were improved, thus the compatibility of them were improved.

Key words: Poly lactic acid (PLA); Calcium carbonate; Talcum (Ta); KH-550; Melt blending