通过超声分散和模具浇注成型法制备了周期性孪晶结构碳化硅(SiC)纳米线改性环氧树脂,探讨了SiC纳米线的周期性孪晶结构及含量对环氧树脂复合材料力学性能的影响.结果表明,周期性孪晶结构SiC纳米线的加入明显改善了环氧树脂基体的力学性能,孪晶结构有助于提高SiC纳米线与基体树脂之间的相互结合程度.随着孪晶SiC纳米线含量的增加,复合材料的拉伸性能和弯曲性能都呈现出先增加后减小的趋势.当SiC纳米线的含量为2%时,复合材料的拉伸强度、拉伸弹性模量、断裂伸长率、弯曲强度和弯曲弹性模量均达到最大值,相比于纯环氧树脂分别提高了90.6%,37.8%,38.3%,53.4%和24.5%.当SiC纳米线含量为3%时,弯曲应变达到最大值(6.72%),相比于环氧树脂提高了32.0%.%The epoxy matrix modified by periodically twinned SiC nanowires were prepared by using ultrasonication and the cast molding method. The influences of the structure and content of the periodic twins of SiC nanowires on the mechanical proper-ties of epoxy resin composites were researched. The results indicate that the improved mechanical properties of epoxy resin/SiC nanowires composites can be attributed to the periodically twinned SiC nanowires. The enhanced bonding between nanowires and epoxy resin due to the twin structure. The tensile properties and the bending properties of epoxy resin/SiC nanowires composites increase firstly and then decrease with the increasing of SiC nanowire addition. When the content of SiC nanowires loading reaches 2%,the tensile strength,tensile modulus,elongation at break,flexural strength and flexural modulus reach the highest value,which are increased by 90.6%,37.8%,38.3%,53.4% and 24.5% respectively. When the content of SiC nanowires loading reaches 3%,the flexural strain reaches the highest value (6.72%),which are increased by 32.0%.
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