基于空间限域强制组装法制备短切碳纤维-碳纳米管/聚二甲基硅氧烷导电复合材料性能  

Properties of short carbon fiber-carbon nanotubes/polydimethylsiloxane conductive composites prepared by spatial confining forced network assembly method

作　　者：范晓静 吴大鸣[1] 高小龙 黄尧 石梦阳 高孔超 FAN Xiaojing;WU Daming;GAO Xiaolong;HUANG Yao;SHI Mengyang;GAO Kongchao(School of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学机电工程学院

出　　处：《复合材料学报》2019年第11期2552-2560,共9页Acta Materiae Compositae Sinica

基　　金：基于强制组装-锚固法制备高灵敏度柔性传感器(JD1810)

摘　　要：采用空间限域强制组装(SCFNA)法制备短切碳纤维-碳纳米管/聚二甲基硅氧烷(SCF-CNTs/PDMS)导电复合材料,研究SCFNA方法制备SCF-CNTs/PDMS复合材料对断面形态变化、导电性能和力学性能的影响。结果表明,通过SCFNA制备的SCF-CNTs/PDMS导电复合材料得到了密实有效的导电网络,由于缩短了导电填料之间的距离,实现了在低浓度填料下增大复合材料的导电性能和力学性能。在填料总量不变的前提下,SCF/PDMS复合材料中添加少量的CNTs,SCF与CNTs之间能形成较好的协同作用。并发现SCF质量分数为8wt%、CNTs质量分数为2wt%的SCF-CNTs/PDMS复合材料与SCF质量分数为10wt%的SCF/PDMS复合材料相比,其导电性能提高了33%,力学性能提高了144%;在SCF/PDMS复合材料中添加较多的CNTs,由于CNTs之间发生团聚现象,SCF-CNTs/PDMS复合材料的导电性能和力学性能均有所下降。SCF质量分数为5wt%、CNTs质量分数为5wt%的SCF-CNTs/PDMS复合材料随着密炼转速由40r/min逐步增加到80r/min,CNTs团聚现象有所改善,但是由于扭矩的增大,SCF受到的剪切作用力增大,SCF大部分被搅碎,在导电复合材料中,SCF起主要连接导电网络的作用。因此,SCF质量分数为5wt%、CNTs质量分数为5wt%的SCFCNTs/PDMS复合材料导电性能反而随着密炼转速的提高而降低。The short carbon fiber-carbon nanotubes/polydimethylsiloxane(SCF-CNTs/PDMS)conductive composites were prepared by spatial confining forced network assembly(SCFNA)method.The influence of SCF-CNTs/PDMS composites prepared by SCFNA method on the morphology,electrical conductivity and mechanical properties of the sections was studied.The results show that a dense and effective conductive network is obtained by preparing the SCF-CNTs/PDMS conductive composites by SCFNA method.The electrical conductivity and mechanical properties of the SCF-CNTs/PDMS composite are increased with low concentration fillers due to the shortened distance between the conductive fillers.Add a small amount of CNTs to SCF/PDMS with the same amount of filler,agood synergy between SCF and CNTs can be formed.The performance of SCF-CNTs/PDMS composite(the mass fraction of SCF is 8wt%,the mass fraction of CNTs is 2wt%)is found to be 33%higher in conductive properties and 144%higher in mechanical properties than the SCF/PDMS composite(the mass fraction of SCF is 10wt%).More CNTs have been added to SCF/PDMS composite.Due to the agglomeration between CNTs,the electrical and mechanical properties of the SCF-CNTs/PDMS composites decrease;as the mixing speed gradually increases from 40r/min to 80r/min,the CNTs agglomeration phenomenonin in the SCF-CNTs/PDMS composite(the mass fraction of SCF is 5wt%,the mass fraction of CNTs is 5wt%)is improved.Due to the increase of torque,the shearing force of the SCF is increased,and most of the SCF is crushed.In conductive composites,SCF acts as a primary connection to the conductive network.Therefore,the conductivity of SCF-CNTs/PDMS composite(the mass fraction of SCF is 5wt%,the mass fraction of CNTs is 5wt%)decreases with the increase of the mixing speed.

关 键 词：复合材料 空间限域 强制组装 电导率 导电网络 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]