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氰酸酯改性环氧树脂复合材料的研究

发布时间:2019-07-11 08:04
【摘要】:采用双酚A型二氰酸酯对环氧树脂E51进行改性,并制备出玻璃纤维增强复合材料。通过傅里叶红外光谱(FTIR)、动态热力学分析(DMA)对不同质量比的环氧树脂/氰酸酯的共固化产物结构特征以及复合材料的玻璃化转变温度进行了研究,同时测定并讨论了对复合材料的拉伸性能、弯曲性能、吸湿性能的影响。结果表明,在环氧树脂和氰酸酯共固化体系中,随着氰酸酯含量的增加,固化物中三嗪环的相对含量增加,VA唑烷酮的相对含量降低。当环氧树脂/氰酸酯质量比为50/50时,复合材料的玻璃化转变温度为215.6℃,与未改性相比提高了49.7℃;650h后吸水率显著降低,仅为0.69%;但拉伸强度和弯曲强度略有降低。扫描电镜(SEM)分析表明,加入氰酸酯后,增加了复合材料的残余应力,使复合材料呈现出脆性断裂。
[Abstract]:Epoxy resin E51 was modified by bisphenol A dicyanate ester and glass fiber reinforced composites were prepared. The structural characteristics of epoxy resin / cyanate ester co-curing products with different mass ratios and the glass transition temperature of the composites were studied by Fourier transform infrared spectroscopy (FTIR),) dynamic thermodynamic analysis. The effects on the tensile properties, bending properties and moisture absorption properties of the composites were also measured and discussed. The results showed that in the co-curing system of epoxy resin and cyanate ester, the relative content of triazinone ring increased and the relative content of VA zolidinone decreased with the increase of cyanoate content. When the mass ratio of epoxy resin to cyanate ester is 50 / 50, the glass transition temperature of the composites is 215.6 鈩,

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