中文摘要：

为了研究纳米级SiO2、碳纤维（CF） 对环氧树脂（EP） 基复合材料动态热力学性能的影响,制备了不同用量（ 分别为EP 质量的0% 和4%） 纳米SiO2、不同体积分数（ 分别为5%,10%,15%,20%）CF 增强EP 基复合材料弯曲试样,对试样进行了多频扫描动态热力学分析（DMA）,研究了纳米SiO2 和CF 对复合材料玻璃化转变温度（Tg）、储能模量、表观活化能和最大损耗因子的影响.结果表明,总体上添加4% 的纳米SiO2 后复合材料的Tg 下降2~6℃;100℃之前,测试频率对复合材料的储能模量影响较小,且未含SiO2 的试样储能模量曲线比含SiO2 的试样较为平坦;当CF体积分数分别为10%,15%,20% 时,添加4% 纳米SiO2 的EP/CF 复合材料的在40℃下的储能模量较未加纳米SiO2时提升31.2%,135.5%,13.6%,表明纳米SiO2 和CF 展现出很好的协同效应从而提升了复合材料储能模量,而最大损耗因子分别下降3.7%,6.5%,14.8%,表明纳米级SiO2 有助于增强复合材料的刚性;当纳米SiO2 用量为EP 质量的4%,CF 体积分数为15% 时,复合材料内部作用力最大,表观活化能达到569 kJ/mol,呈现了很好的协同效果.

英文摘要：

In order to investigate the effects of nano-silica （SiO2） and carbon fiber （CF） on the dynamic thermomechanical performancesof epoxy resin （EP） based composites,the composite bending specimens with different contents of nano-SiO2 （respectively0% and 4% of EP mass） and different volume percentage of carbon fibers （respectively 5%,10%,15% and 20%） were prepared.The DMA with multi-frequency scanning were conducted for the specimens,the effects of nano-SiO2 and CF on the glass transitiontemperature （Tg）,storage modulus,apparent activation energy and maximum loss factor of the composites were studied. The resultsshow that,Tg of the composites added with nano-SiO2 decrease by 2–6℃ as a whole. Before 100℃,the test frequency has less impacton the storage modulus of the composites,and the storage modulus curves of the composites without nano-SiO2 sample are relativelymore flat than those containing nano-SiO2. When the volume fraction of CF is 10%,15 % and 20%, adding 4% nano-SiO2,thestorage modulus of the composite at 40℃ increases by 31.2%,135.5%,13.6% respectively compared with the composites withoutnano-SiO2,which indicates that nano-SiO2 and CF exhibit good synergistic effect for promoting the storage modulus,moreover,the maximum loss factor decreases by 3.7%,6.5%,14.8% respectively,which shows that nano-SiO2 can help to enhance the rigidityof the composites. When the content of nano-SiO2 is 4% of EP mass and the volume fraction of CF is 15%,the internal force of thecomposite reaches maximum and the apparent activation energy is 569 kJ /mol,which shows a good synergistic effect.