扩链剂TMP-6000对聚乳酸/聚（3-羟基丁酸-co-3 -羟基戊酸酯）共混物性能的影响

以扩链剂TMP-6000为增容剂，采用熔融共混制备了聚乳酸（PLA）和聚（3羟基丁酸co3羟基戊酸酯）（PHBV）复合材料，研究了TMP-6000对PLA/PHBV复合材料的结晶行为、微观结构、力学性能的影响。结果表明，无定形PLA的加入抑制了PHBV的结晶，TMP-6000的加入使得PLA/PHBV复合材料的结晶能力变弱，提高了PLA的冷结晶温度，且当TMP-6000含量为0.5 %（质量分数，下同）时，PLA的冷结晶峰开始消失，且适量的TMP-6000使得PHBV的玻璃化转变温度（Tg）升高；TMP-6000的加入使得PHBV均匀分散于PLA基体中，且当TMP-6000含量为0.7 %时，PLA与PHBV的相容性最好；TMP-6000的加入显著提高了PLA/PHBV复合材料的分子量；TMP-6000提高了PLA与PHBV之间的结合力，提高了复合材料的拉伸强度，但断裂伸长率有稍微地降低。

Effect of Chain Extender TMP-6000 on Properties of Poly(lactic acid)/ Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Blends

The poly(lactic acid) (PLA)/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) blends were prepared by a melt-blending method using a chain extender (TMP-6000) as a compatibilizer. The effect of TMP-6000 on the crystallization behavior, microstructure and mechanical properties of PLA/PHBV blends was investigated. The DSC analysis results indicated that the addition of amorphous PLA prevented the crystallization of PHBV and depressed the crystallinity of the blends. However, the cold crystallization temperature of PLA was improved. The cold crystallization peak of PLA domain tended to disappear for the blends with 0.5 wt % TMP-6000. The glass transition temperature of PHBV phase increased with the addition of an appropriate amount of TMP-6000. The morphological observation indicated that PHBV was dispersed homogenously in the PLA matrix in the presence of TMP-6000, and an optimal compatibility was achieved for the blends with the addition of 0.7 wt % TMP-6000. Moreover, the addition of TMP-6000 increased the molecular weight of PLA/PHBV blends significantly. The interface adhesion and tensile strength of the blends were enhanced due to the introduction of TMP-6000, and however the elongation at break decreased slightly.