选用一款自制的具有超支化分子结构的环氧树脂(EHBP),引入到双酚A型环氧树脂体系中参与树脂共固化,制备了一种超支化分子改性环氧树脂材料。采用DSC非等温曲线外推法,研究了混合树脂体系的固化反应动力学行为,优化了树脂的固化工艺条件。分析发现,EHBP对双酚A型环氧树脂具有明显增韧改性效果。在 EHBP最优加入量5%的情况下,与未添加超支化分子的对照样相比,固化物的拉伸强度、弯曲强度、压缩强度和冲击强度均提升了约20%,且拉伸断裂伸长率提高了24%。动态力学分析(DMA)结果表明,EHBP的引入可以显著提升材料的阻尼峰强度,损耗模量从138MPa提高至185MPa,即有利于环氧树脂固化物的阻尼减振性能。单悬臂模式下震动测试频率从1Hz提高至100Hz,材料的阻尼峰从125℃向高温方向移动至156℃,对高频高温下的材料的阻尼性能有一定贡献。
In this paper,a self-made epoxy resin with hyperbranched molecular structure (EHBP) was introduced into bisphenol A epoxy resin system to participate in resin co-curing,and a hyperbranched molecular modified epoxy resin material was prepared.Its kinetics behavior of curing reaction was studied by DSC non-isothermal curve extrapolation method,and the optimal curing condition was in turn determined.It was found that EHBP had obvious toughening effect on bisphenol A epoxy resin.Under the condition of the optimal addition of 5% EHBP,the tensile strength,bending strength,compressive strength and impact strength of the cured product were increased by about 20%,and the elongation at break was increased by 24% compared with the control sample without hyperbranched molecules.Moreover,dynamic mechanical analysis (DMA) showed that the incorporation of EHBP significantly improved the intensity of the damping peak in the temperature spectrum and the loss modulus increased from 138 to 185MPa,which was conducive to the damping performance.As the test frequency in single cantilever mode increased from 1 to 100Hz,the damping peak moved from 125 to 156℃,which made a certain contribution to the damping performance of materials at high frequency and high temperature.
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