Dynamic Thermomechanical Analysis of Epoxy Resin/Silica/Carbon Fiber Composites
In order to investigate the effects of nano-silica (SiO2) and carbonfiber (CF) on the dynamic thermomechanical per-formances of epoxy resin (EP) based composites,the composite bending specimens with different contents of nano-SiO2 (respectively 0% and 4% of EP mass) and different volume percentage of carbonfibers (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 transition temperature (Tg),storage modulus,apparent activation energy and maximum loss factor of the composites were studied. The results show that,Tg of the composites added with nano-SiO2 decrease by 2–6℃ as a whole. Before 100℃,the test frequency has less im-pact on the storage modulus of the composites,and the storage modulus curves of the composites without nano-SiO2 sample are rela-tively moreflat than those containing nano-SiO2. When the volume fraction of CF is 10%,15 % and 20%, adding 4% nano-SiO2,the storage modulus of the composite at 40℃ increases by 31.2%,135.5%,13.6% respectively compared with the composites without nano-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 rigidity of 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 the composite reaches maximum and the apparent activation energy is 569 kJ/mol,which shows a good synergistic effect.
carbonfibersilicadynamic thermomechanical analysisepoxy resinactivation energy
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NSTL
万方数据
维普
