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首页> 外文期刊>Journal of Polymers and the Environment >The Effect of Different Acrylic-Based Rubbers on the Crystallization Behavior of PLA/PDLA Stereocomplex
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The Effect of Different Acrylic-Based Rubbers on the Crystallization Behavior of PLA/PDLA Stereocomplex

机译：不同丙烯酸类橡胶对PLA / PDLA立体复合晶体结晶行为的影响

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摘要

This study investigated the performance of two acrylic rubbers on the improvement of mechanical and thermal properties of polylactic acid (PLA)/ poly(D-lactide) (PDLA) stereocomplex. The selected acrylic-based rubbers consisted of a commercial acrylic rubber (ACM) and acrylic core-shell rubber (CSR). In this work, 5 wt% PDLA was melt-blended with PLA to form PLA/PDLA stereocomplex (ST) in the presence of a 15 wt% acrylic-based rubber in an internal mixer at 180 degrees C and 50 rpm. It was found that the small amount of PDLA could successfully form stereocomplex crystals with PLA during melt mixing. The addition of acrylic-based rubbers not only increased the impact strength of the blends but also assisted PLA in forming more perfect crystals. This is because the rubbers could act as nucleation sites for PLA crystallization leading to smaller spherulite size than that of neat unmodified PLA. Comparatively, CSR could provide much higher %crystallinity with quicker nucleation onset than ACM in both PLA and ST systems, even though the crystallization rate was lower. In terms of mechanical properties, CSR also contributed to the highest impact strength due to the smaller size of CSR than ACM in both PLA and ST systems.
机译：本研究研究了两种丙烯酸橡胶对聚乳酸（PLA）/聚（D-丙交酯）（PDLA）立体络合物的机械和热性能的改善的性能。所选择的丙烯酸类橡胶由商业丙烯酸橡胶（ACM）和丙烯酸芯 - 壳橡胶（CSR）组成。在这项工作中，将5wt％PDLA用PLA熔融混合，以在180℃和50rpm的内部混合器中在15wt％丙烯酸类橡胶存在下形成PLA / PDLA立体络合物（ST）。结果发现，在熔融混合过程中，少量PDLA可以成功地用PLA形成立体络合物晶体。加入丙烯酸基橡胶不仅增加了混合物的冲击强度，而且还增加了辅助PLA形成更完美的晶体。这是因为橡胶可以充当PLA结晶的成核位点，导致比整齐的PLA更小的球晶尺寸。相比之下，即使结晶率较低，CSR可以在PLA和ST系统中提供比ACM更快的成核效果更高的结晶度。就机械性能而言，CSR也有助于由于CSR尺寸小于PLA和ST系统中的CSR尺寸的最高冲击强度。

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