Super toughed poly (lactic acid)/poly (ethylene vinyl acetate) blends compatibilized by ethylene-methyl acrylate-glycidyl methacrylate copolymer

材料科学 甲基丙烯酸缩水甘油酯 增容 丙烯酸甲酯 混溶性 聚合物混合物 甲基丙烯酸甲酯 共聚物 复合材料 高分子化学 化学工程 聚合物 工程类
作者
Mengmeng Wang,Xianrong Liang,Heng Wu,Linlin Huang,Gang Jin
出处
期刊:Polymer Degradation and Stability [Elsevier BV]
卷期号:193: 109705-109705 被引量:20
标识
DOI:10.1016/j.polymdegradstab.2021.109705
摘要

Poly (lactic acid) (PLA), as a biodegradable and biocompatible polymer, has attracted extensive attention and investigation in recent years. However, the inherent brittleness of PLA greatly limits its application. In this work, super toughed PLA-based blends were prepared by facile melt blending of PLA with poly (ethylene vinyl acetate) (EVA) and compatibilized by ethylene-methyl acylate-glycidyl methacrylate (E-MA-GMA), owing to the partial miscibility with EVA domains and the chemical reactions with PLA matrix of E-MA-GMA. Micromorphology reveals that E-MA-GMA effectively tunes the interface interactions and phase morphology of the incompatible PLA and EVA. Increasing the E-MA-GMA content promotes the phase adhesion and increases the interface thickness, thus producing a super-toughened blend behaving an incomplete fracture during impact tests. The maximum impact strength (about 77.6 kJ/m2) was obtained for the ternary blend with 12 wt% E-MA-GMA, which is 27.7 times higher than that of neat PLA. Rheological studies showed that the viscosity was enhanced for the ternary blends with large amounts of E-MA-GMA at low frequency. The PLA crystallinity was suppressed and the thermal stability was improved in the ternary blends. Micromechanical deformations and toughening mechanisms were studied, indicating that the matrix shear yielding, induced by the improved interface adhesion and the formed semi-continuous microstructure, was the main source for impact energy dissipation.
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