热塑性环氧树脂合成及增韧低温复合材料

doi:10.7527/S1000-6893.2023.29623

Abstract

Abstract:

To address the problem of delamination damage in Carbon Fiber/Epoxy Resin （CF/EP） composites at low temperatures， thermosetting epoxy resin was first modified to produce Thermoplastic Epoxy Resin （TPE） particles of the same system and were applied to toughen the interlayers of the CF/EP composite. The toughening results of these particles were compared at room and low temperatures with commonly used Polyamide 66 （PA66） and Polyether Sulfone （PES） particles. While all three types of thermoplastic resin particles significantly improved toughness， their effects on the basic properties of CF/EP varied. The introduction of PA66 and PES particles increased the toughness of the composite but caused an increase in interlayer thickness and a decrease in basic mechanical properties due to the disparity between the resin matrix and the toughening particles. However， interlayer fracture toughness was significantly improved when TPE particles were added to the CF/EP interlayers， with Mode Ⅱ interlaminar fracture toughness （G_IIC） at room temperature reaching 1 126 J/m²， an increase of 88%， and G_IIC at -183 ℃ reaching 1 386 J/m²， an increase of 109.2%. Thanks to the compatibility and sufficient fusion of TPE particles with the thermosetting epoxy resin in the prepreg， the addition of TPE particles did not significantly affect the thickness， interlaminar shear strength， and flexural strength of the CF/EP laminates at both room and low temperatures， resulting in a unique interlayer structure. Thus， the same system TPE particles proposed can more comprehensively and effectively toughen composites at both room and low temperatures.

Key words: thermoplastic epoxy resin particles, carbon fiber/epoxy resin, interlaminar toughening, low-temperature toughness, shear strength, flexural strength

CLC Number:

V258

Xin LIU, Wenxuan YIN, Duo CHEN, Yongbo HOU, Lu ZHANG, Zhanjun WU. Synthesis of thermoplastic epoxy resin and toughening low⁃temperature composite materials[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(16): 429623-429623.

Figures/Tables 13

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Synthesis of thermoplastic epoxy resin and toughening low⁃temperature composite materials

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