English Abstract

Properties of Multiwall Carbon Nanotubes / Polystyrene-block-polybutadiene-block-polystyrene Composites

Takahide KUMAGAI *1
Wataru SUZUKI *1
Eisuke YAMADA *2
Satoshi IINOU *4
Morinobu ENDO *5
*1:Aichi Institute of Technology, Graduate School of Engineering, Department of Applied Chemistry
*2:Aichi Institute of Technology, Department of Applied Chemistry, Toyota-shi, Aichi, Japan
*3:Nissin Kogyo Co., Ltd., Ueda, Nagano, Japan
*4:MEFS Co., Ltd., Kurita, Nagano, Japan
*5:Dept. of Electrical and Electronic Engineering, Shinshu University, Nagano, Nagano, Japan
Nippon Gomu Kyokaishi,(2010),83(8),258-263 Original Paper in Japanese

The influence of characteristics of multiwall carbon nanotubes (MWCNTs) on the properties of polystyrene-block-polybutadiene-block-polystyrene (SBS) / MWCNT composites was investigated. The three types of MWCNTs which have a different in the degrees of graphitization (CNT-1;φ87 nm, G/D ratio 9.09 and CNT-2;φ87 nm, G/D ratio 0.78) and the diameter (CNT-3;φ10-15 nm) were used as a filler. The composites were prepared using a mixing roll. The tensile moduli of the composites were improved even at low concentration of MWCNTs. The volume resistivity of the composite compounded with CNT-1 was markedly decreased at the lowest content of MWCNT, 4.4 vol%. The new peak of the loss tangent (tan δ) was observed around −10 in the temperature dependence of tan δ for the composites compounded with CNT-1. These results suggest that another relaxation system in SBS was newly formed by compounding CNT-1.

Keywords: Multiwall Carbon Nanotube, Vapor-grown Carbon Fiber, Styrene Block Copolymer, Composite, Phase Structure