writer：Yulin Feng, Guiyan Zhao, Jinghua Yin, Wei Jiang
keywords：聚乳酸, 高抗冲, 反应增容, 催化剂, EMA-GMA, N,N-二甲基十八胺
source：期刊
specific source：Polymer International, 2014, 63(7), 1263-1269
Issue time：2014年

摘要：聚乳酸（PLA）固有的脆性限制了其广泛应用。本文通过添加少量N,N-二甲基十八胺（DMSA）催化剂，制备了高抗冲PLA/乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯无规三元共聚物（EMA-GMA）共混物。结果表明，添加DMSA可显著提高不同PLA/EMA-GMA共混物的缺口冲击性能；特别是含20 wt% EMA-GMA的共混物，添加0.2 wt% DMSA后缺口Izod冲击强度由35.6 kJ/m2提高到83.5 kJ/m2。红外光谱研究表明，DMSA促进了EMA-GMA环氧基团与PLA端基（-OH、-COOH）之间的反应，显著改善了界面粘附，使分散相在PLA基体中获得更好润湿并形成更细的EMA-GMA分散粒子。因此，缺口冲击强度的大幅提高归因于DMSA促进的有效反应增容。

Abstract：The inherent brittleness of poly(lactic acid) (PLA) limits its wide application in many fields. Here, high-impact PLA/ethylene-methyl acrylate-glycidyl methacrylate random terpolymer (EMA-GMA) blends were prepared with the addition of a small amount of N,N-dimethylstearylamine (DMSA) catalyst. The notched impact resistance of various PLA/EMA-GMA blends could be considerably improved by adding DMSA. In particular, the notched Izod impact strength of the blend with 20 wt% EMA-GMA increased from 35.6 to 83.5 kJ/m2 by adding 0.2 wt% DMSA. Reactive compatibilization between PLA and EMA-GMA with DMSA was studied using Fourier transform infrared spectroscopy. The results indicated that DMSA promoted the reaction between the epoxide group of EMA-GMA and end groups (-OH, -COOH) of PLA. This considerably improved the interfacial adhesion, leading to better wetting of the dispersed phase by the PLA matrix and finer dispersed EMA-GMA particles. Therefore, the significant increase in notched impact strength was attributed to the effective reactive compatibilization promoted by DMSA.

论文链接：https://doi.org/10.1002/pi.4632