Phase Structure and Thermo-electric Effect of Multi-walled Carbon Nanotubes/ Thermoplastic Vulcanizate Composites Prepared by Dynamic Vulcanization
TANG Qi1, YAN Tongtong1, SUN Hao1, WANG Xiaolei1,2, WANG Chunfu1, ZONG Chengzhong1,2
1 School of Materials Science and Engineering, University of Science and Technology Qingdao, Qingdao 266042, China 2 Key Laboratory of Rubber-plastics of Ministry of Education, Qingdao 266042, China
Abstract: MWCNTs/TPV composites were prepared by dynamic vulcanization method, the effect of three different dynamic vulcanization processes and the content of MWCNTs on the phase structure, dielectric properties, thermal conductivity and physical properties of MWCNTs/TPV composites were investigated. The MWCNTs/TPV composites exhibited “island” structure, and the IIR crosslinked particles are dispersed in the PP matrix in a micron state. The dynamic vulcanization process mainly affected the distribution of MWCNTs. The MWCNTs/TPV composites with uniform distribution of MWCNTs in two phases had higher thermo-electric properties. When the MWCNTs content reached the percolation threshold (3wt%), the network structure of MWCNTs was formed, and the AC conductivity, dielectric constant and thermal conductivity of MWCNTs/TPV composites increased sharply. With the increase of MWCNTs, the elastic modulus of MWCNTs/TPV composites increased gradually, and the tensile strength increased first and then decreased. MWCNTs could improve the interfacial adhesion of TPV matrix. Compared with pure TPV, when the content of MWCNTs was 3wt%, the tensile strength of MWCNTs/TPV composites was increased by 39%. Based on the phase structure of MWCNTs/TPV composites and the percolation threshold of MWCNTs, the network structure of MWCNTs was proposed. The MWCNTs mainly overlaped with the MWCNTs at the PP matrix and the interface between the rubber-plastic phase to form a MWCNTs network.
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