炭黑/碳纳米管并用比对天然橡胶复合材料物理性能和导热性能的影响

Effect of Carbon Black/Carbon Nanotubes Blend Ratio on Physical Properties and Thermal Conductivity of NR Composites

研究炭黑(CB)/碳纳米管(CNTs)并用比对天然橡胶(NR)复合材料物理性能和导热性能的影响,结果表明:与CB/NR复合材料相比,CB/CNTs/NR复合材料的性能提高;当CB/CNTs并用比为28/7时,复合材料的物理性能最佳、储能模量最大、损耗因子峰值最小、热导率最高。透射电子显微镜分析表明:当CB/CNTs并用比为28/7时,CB与CNTs分散均匀,CNTs无弯曲团聚,良好桥接CB,构成有效的填料网络;当CNTs用量继续增大,CNTs和CB出现团聚现象。NR复合材料的性能与填料网络协同作用密切相关。

The effects of the blend ratio of carbon black(CB)/carbon nanotubes(CNTs) on the physical properties and thermal conductivity of natural rubber(NR) composites were studied. The results showed that,the properties of CB/CNTs/NR composites were improved compared with those of CB/NR composites. When the blend ratio of CB/CNTs was 28/7,the physical properties of the composites were the best,the storage modulus was the largest,the loss factor peak value was the lowest,and the thermal conductivity was the highest. It was shown by transmission electron microscopy that when the blend ratio of CB/CNTs was 28/7,CB and CNTs were dispersed uniformly,CNTs were not bent and agglomerated,and the CB aggregates were bridged by CNTs to form a good filler network. When the amount of CNTs continued to increase,a severe agglomeration of CB and CNTs occurred. The properties of the composites were closely related to the filler network synergistic effect.