采用高能球磨分散方法制备了稳定的聚合物多元醇/碳纳米管分散液,并通过原位聚合制备了导电聚氨酯（PU）/碳纳米管（CNTs）硬质泡沫复合材料。采用扫描电镜（SEM）表征了泡沫复合材料的结构,研究了CNTs含量对泡沫材料导电性的影响以及泡沫材料的负温度系数（NTC）效应,通过压缩测试考察了泡沫材料的力学性能。结果表明,CNTs的加入会降低泡孔尺寸,对泡沫材料有较好的增强效果,当CNTs含量为0.6%,在10%应变时复合材料压缩强度提高19.77%;复合材料的电导率随CNTs含量的升高而增加,当CNTs含量为1.5%时,电导率达到2.95×10-2S/m,该材料表现出稳定的NTC效应。
The uniform dispersion of carbon nanotubes in the high viscous polyether polyol was obtained by high energy ball milling process.Polyurethane（PU）/carbon nanotubes（CNTs） rigid foams composite were prepared though in-situ polymerization.The microstructures of the obtained PU/CNTs foams composite were characterized by scanning electron microscope（SEM）,the influence of CNTs content on the electrical conductivity and negative temperature coefficient（NTC） effect of the obtained PU/CNTs foams composite were studied.As the same time,the mechanical properties of the obtained PU/CNTs foams composite were characterized by the compression test.The results show that the addition of CNTs will reduce pore diameter and significantly reinforce the composite.When the CNTs content is 0.6%,the compressive strength is increased by 19.77% as the strain is 10%.The electrical conductivity increases with increasing the CNTs content and reaches 2.95×10-2 S/m when the CNTs content is 1.5%.The PU/CNTs foams composite presents a stable NTC effect.
参考文献
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