Enhancing Impact Strength and Compatibility in Epoxy/EVA Blends: Effects of EVA Functionality and Compatibilizers on Phase Behavior, Mechanical Properties, and Thermal Properties

IF 3.1 3区化学 Q2 POLYMER SCIENCE

Journal of Applied Polymer Science Pub Date : 2026-10-01 Epub Date: 2026-09-17 DOI:10.1002/app.71364

Masoud Khoshnood, Ghodratollah Hashemi Motlagh

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引用次数: 0

Abstract

This research focuses on toughening epoxy (EP) resins by blending with ethylene vinyl acetate (EVA) copolymer, addressing their inherent immiscibility through chemical modification. EVA was partially hydrolyzed (hEVA) to introduce hydroxyl groups and subsequently grafted with (3-glycidyloxypropyl) trimethoxysilane (GPTMS) to create silane-functionalized derivatives (gEVA and hgEVA). Materials included Diglycidyl ether of bisphenol A (DGEBA) epoxy, Jeffamine D230 curing agent, neopentyl glycol diglycidyl ether (NGDE) reactive diluent, Decylamine (DA) co-curing agent, and EVA (19% vinyl acetate). Blends were prepared via melt-mixing at 150°C, followed by co-curing. Characterization methods such as scanning electron microscopy (SEM), optical microscopy, and Fourier transform infrared (FTIR) were employed to analyze morphology, phase behavior, and chemical interactions. SEM revealed finer dispersions with modified EVAs, indicating enhanced interfacial adhesion. FTIR confirmed successful modifications and suggested new bond formations between EP and modified EVA. The study systematically investigated EP/EVA blends at varying compositions (2–10 wt% EVA, 5 wt% modified EVA) and characterized their thermal properties and mechanical performance (tensile testing). Notably, the EP/hgEVA blend demonstrated a significant increase in impact strength (~100%) while largely retaining EP's flexural and tensile strength, highlighting the effectiveness of the compatibilization strategy for advanced coating applications.

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增强环氧树脂/EVA共混物的冲击强度和相容性：EVA功能性和增容剂对相行为、机械性能和热性能的影响

本研究的重点是通过与乙烯乙酸乙烯酯（EVA）共聚物共混增韧环氧树脂（EP），通过化学改性解决其固有的不混溶性。EVA经部分水解（hEVA）引入羟基，接枝（3-缩水甘油氧基丙基）三甲氧基硅烷（GPTMS），得到硅烷功能化衍生物（gEVA和hgEVA）。材料包括双酚A环氧二缩水甘油酯（DGEBA）、杰弗明D230固化剂、新戊二醇二缩水甘油酯（NGDE）活性稀释剂、癸胺（DA）共固化剂和EVA（19%醋酸乙烯酯）。在150°C下通过熔融混合制备共混物，然后共固化。表征方法，如扫描电子显微镜（SEM），光学显微镜和傅里叶变换红外（FTIR）来分析形貌，相行为和化学相互作用。SEM显示，改性eva的分散性更细，表明界面附着力增强。FTIR证实了改性的成功，并表明在EP和改性EVA之间形成了新的键。该研究系统地研究了不同成分的EP/EVA共混物（2-10 wt% EVA， 5 wt%改性EVA），并表征了它们的热性能和机械性能（拉伸测试）。值得注意的是，EP/hgEVA共混物的冲击强度显著提高（~100%），同时在很大程度上保留了EP的弯曲和拉伸强度，突出了增容策略在高级涂层应用中的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Applied Polymer Science 化学-高分子科学

CiteScore

5.70

自引率

10.00%

发文量

1280

审稿时长

2.7 months

期刊介绍： The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.