Poly(L-lactide-b-butylene succinate-b-L-lactide) triblock copolymer: A multi-functional additive for PLA/PBS blend with a key performance on film clarity
Poly(L-lactide-b-butylene succinate-b-L-lactide) triblock copolymer: A multi-functional additive for PLA/PBS blend with a key performance on film clarity
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DOI：
10.1016/j.polymdegradstab.2017.05.029
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发表时间：
2017-08-01
影响因子：
5.9
通讯作者：
Chirachanchai, Suwabun
中科院分区：
文献类型：
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作者：
Supthanyakul, Raksit;Kaabbuathong, Narin;Chirachanchai, Suwabun
聚丁二酸丁二烯（PBS）与聚乳酸（PLA）共混是调控PLA脆性的有效方法。然而，这两种聚合物之间的不混溶性导致产品在强度和清晰度方面存在缺陷。本研究提出了一种简单的三嵌段共聚物，即聚（l -丙交酯-丁二烯琥珀酸-b- l -丙交酯）（PLA -b-PBS-b- plla），作为一种多功能添加剂，即增塑剂、增塑剂和成核剂，用于改善PLA/PBS共混物。基于形成不透明薄膜的PLA/PBS临界含量（80/20 wt%）， PLA -b-PBS-b- plla的添加导致结晶行为和机械性能的剧烈变化。聚乳酸与PBS块长之比和用量是调整聚乳酸/PBS共混物的主要因素。PLLA(40)-b-PBS28-b-PLLA（40）在3 phr时是调整共混物的最佳条件，可以降低玻璃化转变温度（T-g）（从类似于50℃到类似于20℃）以及增加断裂伸长率（两倍）。此时，从小而均匀分散的球晶来看，共混物中PBS和PLA的快速共结晶是提高共混膜清晰度的关键性能。本研究展示了PLA和PBS的嵌段共聚物如何在PLA/PBS共混物的混相、韧性和透明度方面发挥其多功能。(C) 2017年Elsevier Ltd.出版
Blending of poly(butylene succinate) (PBS) with poly(lactic acid) (PLA) is an effective way to fine tune PLA brittleness. However, the immiscibility between these two polymers leads to product defects in terms of strength and clarity. The present work proposes a simple triblock copolymer, i.e. poly(L-lactide-bbutylene succinate-b-L-lactide) (PLLA-b-PBS-b-PLLA), as a multi-functional additive, i.e. compatibilizer, plasticizer, and nucleating agent for improving the PLA/PBS blend. Based on a critical content of PLA/PBS (at 80/20 wt%) which gives the opaque film, an addition of PLLA-b-PBS-b-PLLA induces drastic changes in crystallization behavior and mechanical properties. The ratio between PLLA and PBS block length, and the amount are the factors to fine tune the PLA/PBS blend. The PLLA(40)-b-PBS28-b-PLLA(40) at 3 phr is an optimal condition to tune the blends with the decreases in glass transition temperature (T-g) (from similar to 50 similar to C to similar to 20 degrees C) as well as an increase in the elongation at break (for two-fold). At that time, the rapid co crystallization of PBS and PLA in the blend as seen from the small and homogeneously dispersed spherulite results in a key performance to enhance the clarity of the blend film. The present work demonstrates how the block copolymer of PLA and PBS performs its multi-function for miscibility, toughness, and clarity of PLA/PBS blends. (C) 2017 Published by Elsevier Ltd.