双马来酰亚胺树脂(BMI)具有高强度、耐高温、透波等优异特性,在航空航天、电子通信等领域具有重要应用价值,但其脆性较大地限制了其更广泛的应用。以烯丙基双酚A(DBA)和氰酸酯(CE)与环氧树脂(EP)的反应混合物(CE/EP)为改性剂,制备出了一系列BMI/DBA/CE/EP树脂,并采用万能拉力试验机、傅里叶红外光谱仪和热重分析仪等对其结构、力学性能、热性能及介电性能等进行了研究。结果表明,所制备树脂体系展现出良好的耐高温特性,其中BMI/CE共混树脂的表现最佳,其初始分解温度达到440℃;在介电性能方面也表现出色,可以满足透波复合材料的性能指标要求,尤其0.5BMI/CE/EP显示出最佳的介电性能(介电常数为2.25,损耗角正切为0.009)。随着CE/EP含量的增加,交联密度增大,提升了材料的拉伸强度和冲击强度。其中,BMI/CEEP共混树脂的性能最为突出,拉伸强度达到78.3MPa,冲击强度为10.69kJ/m2。
Bismaleimide (BMI) resins possess the excellent properties of high strength,high-temperature resistance,and wave transparency.These characteristics make them suitable for application in aerospace and electronic communication fields.However,their brittleness limits their broader application.In this study,a series of BMI/DBA/CE/EP resins were prepared using the reaction mixture of diallyl bisphenol A (DBA) and cyanate easter (CE) with epoxy resin EP) as modifiers.The structure,mechanical,thermal and dielectric properties of the prepared resins were studied using universal tensile tester,Fourier infrared spectrometer and thermogravimetric analyzer.The results demonstrated that the prepared resins exhibited excellent high-temperature resistance.The BMI/CE blend resin presented the optimal performance,with an initial decomposition temperature of 440℃.Furthermore,the dielectric properties of the resin system were excellent,meeting the performance index requirements for wave-transparent composites.In particular,the 0.5BMI-CE/EP blend exhibited the best dielectric properties,with a dielectric constant of 2.25 and a dielectric loss tangent of 0.009.As the CE/EP content increased,the cross-linking density increased,thereby enhancing the tensile and impact strength of the materials.Moreover,the BMI/CE/EP blend resin exhibited the most remarkable performance with a tensile strength of 78.3MPa and an impact strength of 10.69kJ/m2.
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基金资助
陕西省教育厅科研项目(21JK20180911);西安市科技计划项目(23GXFW0015)
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