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A relationship between electrical conductivity and photodegradation in styrene-butadiene copolymer/multi-wall carbon nanotube composite

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Abstract

An effect of photodegradation on electrical conductivity of a styrene-butadiene copolymer (SBR)/multiwall carbon nanotube (MWNT) composite was studied with a TiO2/polyethylene oxide/methyl linoleate paint photocatalyst under UV and/or visible light irradiation. An oxidative etching of impurities on the MWNT surface was caused by the UV or visible light irradiation, leading to an increase of quality of MWNT. On the other hand, the photocatalyst addition caused the degradation of MWNT structure. A relationship between the electrical conductivity and MWNT content showed that the MWNT dispersity in a SBR was superior to that in a polystyrene (PS). In addition, the PS addition to SBR matrix caused MWNT aggregation. The electrical conductivity decrease of the MWNT composite was due to electrical percolation structure loss caused by the photocatalyst under the visible light irradiation, and its rate depended on the MWNT dispersity. The PS molecular weight change behavior with the photocatalyst was consistent with the electrical conductivity one of the SBR/MWNT. The photocatalyst ability was estimated from the electrical conductivity of the SBR/MWNT.

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Acknowledgments

This work was supported by the Grant-in-Aid for Scientific Research, No. 25740040 from Japan Society for the Promotion of Science.

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Authors and Affiliations

  1. Polymeri Materials Laboratory, Chemistry and Materials Program, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki, 852-8521, Japan

    Hisayuki Nakatani, Mayumi Hirooka, Kanae Yamaguchi & Suguru Motokucho

  2. Department of Biotechnology and Environmental Chemistry, Kitami Institute of Technology, 165 Koen-cho, Kitami, Hokkaido, 090-8507, Japan

    Noriyasu Okazaki

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  1. Hisayuki Nakatani
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  2. Mayumi Hirooka
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  3. Kanae Yamaguchi
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  4. Suguru Motokucho
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  5. Noriyasu Okazaki
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Correspondence to Hisayuki Nakatani.

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Nakatani, H., Hirooka, M., Yamaguchi, K. et al. A relationship between electrical conductivity and photodegradation in styrene-butadiene copolymer/multi-wall carbon nanotube composite. Polym. Bull. 74, 1193–1206 (2017). https://doi.org/10.1007/s00289-016-1771-7

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  • DOI: https://doi.org/10.1007/s00289-016-1771-7

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