Grafting of branched polymers onto the surface of vapor grown carbon fiber and their electric properties |
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| Authors: | Gang Wei Hiroshi Saitoh Kazuhiro Fujiki Takeshi Yamauchi Norio Tsubokawa |
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| Affiliation: | (1) Venture Business Laboratory, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, 950-2181 Niigata, Japan;(2) Department of Material Science and Technology, Faculty of Engineering, Niigata University, 8050, Ikarashi 2-no-cho, Nishi-ku, 950-2181 Niigata, Japan;(3) Division of Life and Health Sciences, Joetsu University of Education, 1, Yamayashiki, Joetsu, 943-8521 Niigata, Japan;(4) Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, 950-2181 Niigata, Japan;(5) Center for Transdisciplinary Research, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, 950-2181 Niigata, Japan |
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| Abstract: | The grafting of branched polymers onto vapor grown carbon fiber (VGCF) surface and their electric
properties of the composite prepared from the branched polymer-grafted VGCF were investigated. In the first
step, the grafting of copolymers having pendant peroxy groups onto VGCF was achieved by the copolymerization
of 1-(t-butylperoxy-i-propyl)-3-i-propenylbenzene (BPPB) with vinyl monomers initiated by the system consisting
of Mo(CO)6 and trichloroacetyl groups previously introduced onto the surface. In
the second step, the postpolymerization of vinyl monomers was initiated by pendant peroxy groups of
grafted poly(vinyl monomer-co-BPPB) on the surface to give branched
vinyl polymer-grafted VGCF. The dispersibility of VGCF in THF was remarkably improved by grafting of
branched polymers onto the surface. The electric resistance of composites prepared from the branched
polymer-grafted VGCF suddenly increased when the composites were transferred into solvent vapors and
suddenly decreased when they were transferred to dry air. |
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