碳纤维混杂增强复合材料由于具有重量轻、可设计性强等诸多优点,广泛用于汽车、海洋、航空航天等行业.根据固化剂与环氧树脂的配比化学原理,计算出石墨烯-碳纤维混杂增强树脂基(GO-CF/EP)复合材料的最佳配比为1:5,并采用真空浸渗热压成型工艺(VIHPS)制备1∶2～1∶7共六个配比的试样,结合形状记忆性能测试及微观形貌的观察,得到固化剂与环氧树脂实际最佳配比.实验结果表明,GO-CF/EP复合材料性能主要取决于体系中交联度的大小,交联度越大,复合材料的形状记忆性能越好,微观组织形貌也较理想.当基体配比为1∶5时,GO-CF/EP复合材料体系中交联度最大,微观形貌呈现均匀致密的状态,形状固定率最大,为95.90％;形状回复率最大,为95.40％;形状回复时间最短,为80.30 s;形状回复力最大,为9.48N.当基体配比为1∶2或1∶7时,固化剂过量或不足,交联度较小,微观组织形貌中有大量的基体聚集区,其形状记忆性能下降,形状固定率及回复率也相应减小,分别为82.99％,81.66％,81.91％,78.75％;形状回复力分别只有5.20N和5.50 N.
Effect of matrix ratio on microstructure and shape memory properties of GO-CF/EP composites prepared by VIHPS
Due to their benefits including light weight and strong designability,carbon fiberhybrid reinforced composites have been used in numerous industries including the automotive,marine,and aerospace sectors.According to the ratio formula of epoxy resin and curing agent,the optimal ratio of graphene-carbon fiber hybrid reinforced resin matrix(GO-CF/EP)composite was calculated as 1:5,and six ratios of 1∶2～1∶7 were prepared by vacuum infiltration hot pressing process(VIHPS).Combined with shape memory performance test and microscopic morphology observation,it was possible to achieve the ideal ratio of curing agent to epoxy resin.The experimental findings demonstrate that the degree of cross-linking in the system has a major influence on the characteristics of GO-CF/EP composites.The higher the degree of cross-linking,the better the shape memory performance and the ideal microstructure of the composites.When the matrix ratio is 1:5,the microstructure of the GO-CF/EP composite system is uniform and dense,the cross-linking degree is the highest,the shape fixation rate is the highest(95.90％),the shape recovery rate was the largest 95.40％.Shape recovery time was the shortest,80.30 s;the shape recovery force is the largest,9.48 N.When the matrix ratio is 1∶2 or 1∶7,the curing agent is excessive or insufficient,the cross-linking degree is small,and there are a large number of matrix accumulation region in the microstructure.The shape memory performance decreased,and the shape fixation rate and recovery rate decreased correspondingly,which were 82.99％,81.66％,81.91％and 78.75％,respectively.The shape recovery force is only 5.20 N and 5.50 N,respectively.
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