碳纳米管增强硅橡胶的导热和力学性能研究

Study on Thermal Conductivity and Mechanical Properties of Silicone Rubber Reinforced by Carbon Nanotubes

碳纳米管(CNT)具有较高的热导率,因而有巨大的潜在应用。为研究碳纳米管用量对硅橡胶(SR)导热和力学性能的影响,通过应变扫描、扫描电镜、力学性能、热失重等对CNT/SR复合材料进行了表征。结果表明,复合材料的储能模量随着应变的增加逐渐降低,表现出明显的Payne效应;随着碳纳米管用量的增加,胶料的正硫化时间延长,最大转矩和最小转矩差值增加,拉伸强度、拉断伸长率、100%定伸应力和撕裂强度也相应得到改善;与纯硅橡胶相比,CNT/SR复合材料的热导率最多提升了139.2%,达到0.4237 W/(m·K);CNT/SR复合材料还具有良好的热稳定性,其600℃时的质量损失率随着碳纳米管用量的增加有所降低。

The carbon nanotubes have great potential for various applications due to their excellent thermal conductivity.This paper studies the effect of the amount of carbon nanotubes on the properties of silicone rubber.The CNT/SR composites have been characterized by rheological performance(RPA),scanning electron microscopy(SEM),mechanical properties,and thermal weight loss.The results show that the storage modulus of the composites gradually decreases with the increase of the strain,which indicates the Payne effect.With the increase of the amount of carbon nanotubes,the positive vulcanization time of the rubber prolongs,M_H-M_L value increases,and the tensile strength,elongation at break,100%modulus and tear strength have also been improved correspondingly.When compared with pure silicone rubber,the thermal conductivity of CNT/SR composites has increased by 139.2%and reached to 0.4237 W/(m·K).CNT/SR composites also has good thermal stability,and its mass loss rate decreases as the amount of carbon nanotubes increases.