PBAT/PLA薄膜的制备及性能研究

将聚乳酸（PLA）和聚对苯二甲酸-己二酸-丁二醇酯（PBAT）共混制备成共混材料，探讨了不同PLA含量对材料性能的影响。结果表明，PBAT/PLA共混材料中，随着PLA含量的增加，拉伸强度先降低后升高，当PLA含量为90 %时，拉伸强度达到60.12 MPa，而其断裂伸长率从703 %降低至8 %，由韧性材料逐渐转变为脆性材料；PLA含量为30 %时，性能变化出现拐点；PLA含量为50 %时出现明显相分离，且PLA的加入可以加速PBAT材料的结晶，使结晶温度由38 ℃提高至82 ℃；PBAT/PLA共混材料在PLA含量低于70 %时，都可以实现较好的吹膜过程，且薄膜材料的拉伸强度为39.59 MPa，断裂伸长率不低于137 %。

Preparation and Properties of PBAT/PLA Film

In this study, blends from poly(lactic acid) (PLA)and polybutyleneadipate-co-terephthalate (PBAT) was fabricated and the mechanical and bio-degradation properties were studied. It showed that with increasing PLA content, the tensile strength of PBAT/PLA blends increased firstly and then decreased, the elongation at break decreased continuously, and the blends underwent a ductile brittle transition. When PLA content reached 30 wt %, a mechanical property change point occurred. When PLA content reached 50 %, phase separation took place. The addition of PLA could accelerate the crystallization rate of PBAT, which increased the crystallization temperature from 38 ℃ to 82 ℃. PBAT/PLA film could be fabricated with good mechanical property only if PLA content was below 70 %.