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Preparation and Properties of Exfoliated Graphite/Polystyrene Composite

Published online by Cambridge University Press:  21 March 2011

Peng Xiao ,
Luyi Sun ,
Min Xiao  and
Kecheng Gong
Peng Xiao
Affiliation:
Polymer Structure & Modification Lab, South China University of Technology, Guangzhou, 510640, P. R., China
Luyi Sun
Affiliation:
Department of Chemistry, University of Alabama, Tuscaloosa, AL 35487, U.S.A. Polymer Structure & Modification Lab, South China University of Technology, Guangzhou, 510640, P. R. China
Min Xiao
Affiliation:
Polymer Structure & Modification Lab, South China University of Technology, Guangzhou, 510640, P. R., China
Kecheng Gong
Affiliation:
Polymer Structure & Modification Lab, South China University of Technology, Guangzhou, 510640, P. R., China
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Abstract

A composite based on exfoliated graphite (EG) and polystyrene was prepared by polymerization-filling technique. With the argument of the amount of filled EG, the molecular weight of polystyrene in the resulting composite increased and the molecular weight distribution decreased. The glass transition temperature of the polystyrene was determined by dynamic mechanical analysis (DMA) and showed the glass temperature of polystyrene increasing to 123.74°C. The thermal degradation behavior was studied using thermogravimetry (TG) and showed higher thermal stability of the composite than that of pure polystyrene and polystyrene//EG composite prepared by melt-blending. Four-probe instrument and high resistivity meter were used to measure the volume conductivity of the composites. Composites prepared by both polymerization-filling technique and melt-blending exhibit increased electrical conductivity, while composite prepared by polymerization-filling technique has a conductive percolation threshold lower than 2.5wt%.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 661: Symposium KK – Filled & Nanocomposite Polymer Materials , 2000 , KK5.3
Copyright
Copyright © Materials Research Society 2001

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References

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