碳纳米管改性泡沫镍/环氧树脂复合材料阻尼性能

采用一种新型简易的化学气相沉积法(CVD)直接在泡沫镍表面均匀地沉积生长碳纳米管(CNTs),然后通过真空导入模塑成型工艺(VIMP)将选定的环氧树脂体系填入表面负载CNTs的泡沫镍孔洞,制备CNTs-泡沫镍/环氧树脂复合材料。利用FE-SEM、TEM和Raman对在不同反应温度条件下泡沫镍表面形貌和所生成CNTs的形貌、结构及石墨化程度进行了表征,并采用动态机械分析仪(DMA)研究了CNTs对泡沫镍/环氧树脂复合材料阻尼性能的影响。结果表明:当反应温度为680℃时,在泡沫镍表面可获得较好的CNTs沉积效果,且所生成的CNTs石墨化程度和纯度较高且直径尺寸较为均匀。同时所制备的CNTs-泡沫镍/环氧树脂复合材料比泡沫镍/环氧树脂复合材料,最大损耗因子tanδ_(max)从0.69提高到0.78,玻璃化转变温度Tg从60℃偏移到68℃,有效阻尼温域ΔT从39℃扩宽到44℃,整体阻尼性能提高了18.9%。

Damping property of Ni foam/epoxy resin compositesmodified with carbon nanotubes

Carbon nanotubes (CNTs) were directly and uniformly deposited on Ni foam by a simple chemical vapor deposition (CVD) method,and then the selected epoxy resin system was induced into Ni foam supported CNTs to prepare Ni foam/epoxy resin composites modified with CNTs by vacuum infusion molding process (VIMP).Surface morphology of Ni foam and morphology,structure and graphitization of as-formed CNTs were characterized by FE-SEM,TEM and Raman at different reaction temperatures.Meanwhile,the effect of CNTs on damping properties of composites was investigated by dynamic mechanical analysis (DMA).The results show that the CNTs with uniform diameter,high graphitization and purity can be well deposited on Ni foam at 680 ℃.Compared with Ni foam/epoxy resin composites modified without CNTs,the maximum loss factor tanδmax of Ni foam/epoxy resin composites modified with CNTs increases from 0.69 to 0.78,the glass transition temperature Tg shifts from 60℃ to 68℃,the effective damping temperature range ΔT extends from 39℃ to 44℃,and the damping property increases by 18.9%.