Abstract

This study investigated simultaneous improvement in both toughness and heat resistance of polylactic acid (PLA) by incorporating core-shell rubber (CSR), poly D-lactic acid (PDLA), and nucleating agents. CSR was found to provide almost 25 folds increase in the impact strength of PLA with a slight decrease in thermal resistance. PDLA at 5 wt% and three commercial nucleating agents including talc, LAK301, and NAV101 at 0.5–5 wt% were investigated to further improve the thermal properties of the PLA/CSR blend. It was found that heat resistance of the blend strongly correlated with the % PLA/PDLA stereocomplex crystals (X_c,sc). LAK301 was found to be the most effective in improving the heat resistance as it could induce the highest X_c,sc, followed by talc. Their optimal content was 1 wt%. On the other hand, NAV101 not only failed to improve but also worsened both the impact strength and thermal resistance of the blends.

摘要

这项研究研究了通过掺入核壳橡胶（CSR），聚D-乳酸（PDLA）和成核剂同时提高聚乳酸（PLA）的韧性和耐热性。发现CSR使PLA的冲击强度提高了近25倍，而耐热性略有下降。为了进一步改善PLA / CSR共混物的热性能，对5wt％的PDLA和0.5-5 wt％的三种商业成核剂（包括滑石粉，LAK301和NAV101）进行了研究。已经发现，共混物的耐热性与％PLA / PDLA立体复合晶体（X _c，sc）密切相关。发现LAK301对提高耐热性最有效，因为它可以诱导最高的X _c，sc，其次是滑石粉。它们的最佳含量为1重量％。另一方面，NAV101不仅没有改善，而且使掺混物的冲击强度和耐热性均恶化。