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Structure Evolution of Conductive Polymer Composites Revealed by Solvent Vapor Induced Time-dependent Percolation by Jun Rong Li; Jun Wang; Jia Rui Xu; Ming Qiu Zhang; Min Zhi Rong; Qiang Zheng is a scholarly article available to read on EtoBox.

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The authors of this paper synthesized a series of amphiphilic triblock copolymers of polystyrene-b-poly(ethylene glycol)-b-polystyrene (PS-PEG-PS) having different PEG/PS ratios with nearly identical molecular weights of the entire copolymers. The interfacial interactions in the composites consisting of carbon black and the copolymers can thus be tailored. When these conducting composites are exposed to certain solvent vapors, their electrical resistances greatly increase, showing the gas sensitivity. The present work indicated that this switching behavior is controlled by the structural relaxation of the composites because matrix swelling acts as the main mechanism. The response time has been correlated with absolute temperature by Arrhenius equation, and the estimated activation energy reflects mobility of the fillers involved in the solvent induced expansion of the surrounding polymer. Therefore, by using the gas sensibility of the conductive composites, the structure evolution of the composite materials in solid state and the effect of filler/matrix interfacial interaction on the relaxation property of the matrix polymer has been inspected. It was found that lower activation en

Author

Jun Rong Li; Jun Wang; Jia Rui Xu; Ming Qiu Zhang; Min Zhi Rong; Qiang Zheng

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0266-3538)

Published

2006

Language

EN