关键词: 聚乳酸, 聚(3-羟基丁酸-共聚-3-羟基戊酸酯), 滑石粉, 结晶性能, 力学性能

Abstract: Poly(L-lacticacid) (PLA)/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) blends were prepared by a meltblending method. The effects of PLA/PHBV weight ratio and talc content on the properties of PLA/PHBV blends were investigated. With a continuous increase of PHBV content, the crystallinity degree of the blends showed a decrease at first and then began to increase. The blends achieved an increase by 35.9 % in impact strength and by 21.81 % in elongation at break, whereas the tensile strength was reduced. On the other hand, the crystallinity degree of the blends also increased with increasing talc content and their impact strength increased by 12.4 %, followed by a decrease in tensile strength and elongation at break. The mechanical properties of the blends achieved optimum values with addition of 20 wt % PHBV and 1.5 wt %talc.

Key words: poly(L-lacticacid), poly(3-hydroxybutyrate-co-3-hydroxyvalerate), talc, crystallization behavior, mechanical property