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