一维多壁碳纳米管增强丁基橡胶/聚丙烯热塑性弹性体复合材料的相态结构及热电性能研究

制备一维多壁碳纳米管(MWCNTs)增强丁基橡胶(IIR)/聚丙烯(PP)动态硫化热塑性弹性体(TPV)复合材料,研究IIR/PP用量比(简称橡塑比)对复合材料相态结构、介电性能、导热性能和物理性能的影响。结果表明:复合材料呈现“海-岛”相结构,IIR相以微米级交联颗粒分散在PP相中;MWCNTs主要分散在PP中,随着橡塑比的增大,MWCNTs有少量团聚现象;随着橡塑比的增大,复合材料的交流电导率、介电常数和热导率增大,且橡塑比大于6/4时增速减小;随着橡塑比的减小,复合材料的拉伸强度先增大后减小;当橡塑比为5.5/4.5时,复合材料的物理性能较好。

Phase Structure and Thermoelectric Properties of One-dimensional MWCNTs Reinforced IIR/PP TPV Composites

The one-dimensional multi-walled carbon nanotubes(MWCNTs) reinforced butyl rubber(IIR)/polypropylene(PP) thermoplastic dynamic vulcanizate(TPV) composites were prepared. The effects of IIR/PP dosage ratio(rubber/plastic ratio) on the phase structure,dielectric property,thermal conductivity and physical properties of the composites were studied. The results showed that the composites had a “sea-island”phase structure,and the IIR phase was dispersed in PP phase as crosslinked micron-size particles. MWCNTs were mainly dispersed in PP,and began to agglomerate with the increase of the rubber/plastic ratio. The AC conductivity,dielectric constant and thermal conductivity of the composites increased with the increase of the rubber/plastic ratio,and the increase rate decreased when the rubber/plastic ratio was above 6/4. With the decrease of the rubber/plastic ratio,the tensile strength of the composites increased first and then decreased.When the rubber/plastic ratio was 5. 5/4. 5,the physical properties of the composites were better.