Research Branch of Advanced Functional Materials, School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China
tonglifen0214@163.com (L.F.T)
liuxb@uestc.edu.cn (X.B.L.)
收稿:2020-01-02,
修回:2020-1-29,
录用:2020-2-17,
网络首发:2020-04-27,
纸质出版:2020-09
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Yang, G. Y.; Tong, L. F.; Liu, X. B. Design and properties of fluoroelastomer composites , via, incorporation of MWCNTs with varied modification. Chinese J. Polym. Sci. 2020, 38, 983–992
Guang-Yao Yang, Li-Fen Tong, Xiao-Bo Liu. Design and Properties of Fluoroelastomer Composites
Yang, G. Y.; Tong, L. F.; Liu, X. B. Design and properties of fluoroelastomer composites , via, incorporation of MWCNTs with varied modification. Chinese J. Polym. Sci. 2020, 38, 983–992 DOI: 10.1007/s10118-020-2405-y.
Guang-Yao Yang, Li-Fen Tong, Xiao-Bo Liu. Design and Properties of Fluoroelastomer Composites
Multi-walled carbon nanotubes (MWCNTs) modified with silane coupling agent A-1120 (MWCNTs-A1120) were prepared. Compared with the raw MWCNTs
acidified MWCNTs (MWCNTs-COOH)
and MWCNTs grafted with EDA (MWCNTs-NH
2
)
MWCNTs-A1120 have the best dispersion in fluoroelastomer at the same doping ratio. Therefore
fluoroelastomer/MWCNTs-A1120 composite has the best mechanical properties with tensile strength of 13.92 MPa and elongation at break of 111.78%. Then
the effects of doping amount of MWCNTs-A1120 on the electrical properties of the composites were investigated. The dielectric constant of the composite increases with the increase of MWCNTs-A1120
and the dielectric loss does not change much at the low doping amount such as 0.5 wt%. When the doping amount of MWCNTs-A1120 is 5 wt%
the dielectric constant and the dielectric loss value are greatly increased
and the volume resistivity is greatly decreased
which proves that the conductive network is formed in the composite
so the filling amount of 5 wt% is the percolation threshold. The tensile deformation of the sample also affects the electrical properties of the composites. As the tensile deformation increases
the dielectric constant and dielectric loss of the composite decrease. For the composite with 5 wt% MWCNTs-A1120
excessive tensile deformation will destroy the conductive network structure of the composite
so the composite will change from conductive material to dielectric material. Therefore
such composite is a good candidate for flexible conductive material or flexible dielectric material used in harsh environments such as high temperatures and various aggressive solvents.
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