HDI接枝碳纳米管/碳纤维混杂多尺度复合材料的制备和性能

Fabrication and properties of HDI grafted carbon nanotubes/carbon fiber hybird multiscale composites

使用六亚甲基二异氰酸酯(HDI)作为偶联剂,将羧基化碳纳米管化学接枝于氧等离子体活化碳纤维表面,制备碳纳米管/碳纤维多尺度增强体,采用模压工艺制备碳纳米管/碳纤维/环氧树脂混杂多尺度复合材料。利用XPS、SEM、DMA、层间剪切强度(ILSS)等手段对碳纳米管/碳纤维/环氧树脂复合材料的结构和性能进行表征和测试。研究表明:HDI接枝液浓度对复合材料力学性能具有显著影响,与未处理碳纤维复合材料相比,表面化学接枝碳纳米管的碳纤维复合材料层间剪切强度提高了32.1%。

Carboxyl functionalized multi-walled carbon nanotubes（ CNTs） were grafted to the oxygen plasma treated carbon fiber with hexamethylene diisocyanate（ HDI） as coupling agent to engineer the multiscale reinforcement,which was then used to fabricate CNTs / carbon fiber / epoxy composites via compression molding technique. The structure and properties of the resulting hybrid multi-scale composite were characterized and tested by XPS,Scanning electron microscopy（ SEM）,dynamic mechanical analysis（ DMA） and inter-laminar shear strength（ ILSS）,respectively. The results showthat the concentration of HDI grafting solution are responsible for the enhanced mechanical property of the composites. ILSS of the composites containing varying scale reinforcements is increased by 32. 1% as compared to the control carbon / epoxy composites.