High Strength and Toughness Epoxy Nanocomposites Reinforced With Epoxy-Terminated Hyperbranched Polymer

IF 2.7 3区化学 Q2 POLYMER SCIENCE

Journal of Applied Polymer Science Pub Date : 2025-04-17 DOI:10.1002/app.57071

Hongyu Fan, Tao Sun, Shiji Zhang, Zhanjun Wu

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引用次数: 0

Abstract

Epoxy composites reinforced and toughened with an epoxy-terminated hyperbranched polymer (ETHP) were successfully synthesized. The ETHP was derived from a bio-based epoxy resin, and its structure was confirmed using nuclear magnetic resonance (NMR) spectroscopy and Fourier transform infrared (FTIR) spectroscopy. The influence of ETHP content on the mechanical and thermophysical properties of epoxy composites was systematically investigated. The mechanical properties exhibited an initial increase followed by a decline with increasing ETHP loading. The 7.5 wt% ETHP/epoxy composite demonstrated optimal mechanical performance, with a tensile strength of 91.7 MPa, elongation at break of 6.7%, and flexural strength of 145 MPa. Compared to the cured epoxy polymer, they represented increases of 30.6%, 34.3%, and 38.1%, respectively. The glass transition temperature (Tg) of the ETHP/epoxy composites also increases first and then decreases. A maximum Tg is obtained when ETHP content is 5 wt%. It shifted to 174.9°C from 158.6°C of pure epoxy polymer. The excellent overall performance of ETHP/epoxy composites not only broadens the potential applications of epoxy resins but also provides a novel approach for toughening other resin systems.

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环氧端部超支化聚合物增强高强韧环氧纳米复合材料

成功地合成了环氧端部超支化聚合物（ETHP）增强增韧环氧复合材料。通过核磁共振（NMR）和傅里叶变换红外（FTIR）光谱对其结构进行了确证。系统地研究了乙腈含量对环氧复合材料力学性能和热物理性能的影响。随着ETHP载荷的增加，材料的力学性能呈现先上升后下降的趋势。7.5 wt%的ETHP/环氧树脂复合材料表现出最佳的力学性能，抗拉强度为91.7 MPa，断裂伸长率为6.7%，弯曲强度为145 MPa。与固化的环氧聚合物相比，它们分别增加了30.6%、34.3%和38.1%。环氧乙烷/环氧复合材料的玻璃化转变温度（Tg）也呈现先升高后降低的趋势。当ETHP含量为5 wt%时，Tg达到最大值。它由纯环氧聚合物的158.6°C转变为174.9°C。环氧乙烷/环氧复合材料优异的综合性能不仅拓宽了环氧树脂的应用前景，也为其他树脂体系的增韧提供了新的途径。

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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.