蒙脱石/炭对炭纤维/环氧树脂复合材料性能的影响

Improved mechanical and thermal properties of carbon fiber/epoxy composites with a matrix modified by montmorillonite/carbon fillers

以蒙脱石(MMT)为模板,壳聚糖为碳源,采用水热法合成蒙脱石/炭(MMT/C)纳米复合材料。控制蒙脱石/炭中蒙脱石和炭的比例,并添加于环氧树脂中,模压工艺制备多尺度炭纤维/环氧树脂(CF/EP)复合材料。采用三点弯曲测试、断面扫描等研究两种添加剂对复合材料力学性能、动态热机械性能和导热性能的影响。结果表明:壳聚糖在蒙脱石表面水热炭化成炭,含有C=O、O—H和C—N等有机官能团。当壳聚糖与蒙脱石的质量比为0.5时,水热所得的蒙脱石/炭添加量为2 wt%时对炭纤维/环氧树脂的增强效果最佳,复合材料的弯曲强度和弯曲模量分别提高13.4%和20.4%,导热系数提高78.7%。蒙脱石/炭中蒙脱石和炭的协同作用促使蒙脱石/炭在环氧树脂中实现良好的分散;炭中含氮等极性基团与环氧树脂通过化学键合增强蒙脱石/炭与树脂的界面结合,促进应力的传递和分散以及热量的有效传递。

Montmorillonite and carbon(MMT/C)nanofillers was prepared by a hydrothermal method using montmorillonite as the template,chitosan as the carbon source,and were then dispersed in an epoxy resin(EP)to prepare carbon fiber(CF/(MMT/C-EP))composites by a hot pressing method.Results indicated that when the mass ratio of chitosan to MMT was 0.5,the thermal conductivity,flexural strength and elastic modulus of the composite reach maxima,corresponding to increases of 78.7,13.4 and 20.4%,respectively,compared with those without a nanofiller.These improvements are ascribed to an improved dispersion of the nanofiller in EP and stronger interface bonding between the fillers and the EP.