writer：Yulin Feng, Yuexin Hu, Jinghua Yin, Guiyan Zhao, Wei Jiang
keywords：聚乳酸, 乙烯-辛烯共聚物, 反应共混, 增韧, 反应增容, 冲击强度
source：期刊
specific source：Polymer Engineering & Science, 2013, 53(2), 389-396
Issue time：2013年

制备了甲基丙烯酸缩水甘油酯接枝的乙烯-辛烯共聚物（POE-g-GMA），并通过反应共混对聚乳酸（PLA）进行增韧。当弹性体含量高于10 wt%时，PLA/POE-g-GMA共混物的缺口Izod冲击强度显著提高。红外光谱和Molau实验表明，共混过程中PLA的末端羧基与POE-g-GMA的环氧基发生反应，明显改善了增容效果，使分散相在PLA基体中获得更好的润湿，并形成粒径更细、分布更窄的分散粒子。研究还确定了室温下PLA/POE-g-GMA共混体系中分散相粒子的临界粒子间距Lc。

Poly(ethylene octene) grafted with glycidyl methacrylate (POE-g-GMA) was prepared and used to toughen poly(lactic acid) (PLA) via reactive blending. The notched Izod impact strength of PLA/POE-g-GMA blends improved dramatically when the elastomer content was higher than 10 wt%. Reactive compatibilization between PLA and POE-g-GMA was studied by Fourier transform infrared spectroscopy and the Molau test; the results showed that the end carboxyl groups of PLA reacted with the epoxide groups of POE-g-GMA during blending. This considerably improved compatibilization, leading to better wetting of the dispersed phase by the PLA matrix and finer POE-g-GMA particles with a narrow distribution. The critical interparticle distance (Lc) of the dispersed domains for PLA/POE-g-GMA blends at room temperature was also identified.

论文链接：https://doi.org/10.1002/pen.23265