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A continuous spatial confining process towards high electrical conductivity of elastomer composites with a low percolation threshold
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Fu, Hongbo, Xu, Hong, Liu, Ying, Sun, Jingyao, Zhuang, Jian, Gao, Xiaolong, McNally, Tony, Wu, Daming, Huang, Yao and Wan, Chaoying (2022) A continuous spatial confining process towards high electrical conductivity of elastomer composites with a low percolation threshold. Composites Science and Technology, 218 . 109155. doi:10.1016/j.compscitech.2021.109155 ISSN 0266-3538.
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WRAP-continuous-spatial-confining-process-towards-high-electrical-conductivity-elastomer-percolation-2021.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (2994Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.compscitech.2021.10915...
Abstract
Electrically conducting elastomer composites are indispensable in the development of flexible, wearable and soft electronic products. The continuous fabrication of highly electrically conductive polymeric composites at large scale remains a technical challenge due to the lack of control of the dispersion and orientation of the conductive fillers, interfacial interaction and filler-filler network stability in the polymer matrices. Herein, an innovative design was investigated by combining a continuous compression molding and curing through a flexible roller enabled continuous process. This approach forced the alignment of short carbon fibers (SCF) along the rolling direction in a polydimethylsiloxane (PDMS) matrix due to the deformation of the flexible roller, and effectively condensed the conductive SCF network in PDMS, The distance among SCFs can be further reduced with the rolling cycles which is ascribed to a spatial confining-forced network assembly. With a rolling cycle of 20, dual electrical conducting percolation thresholds reached at 0.1 wt% and 0.5 wt% of SCF, respectively. A maximum electrical conductivity of 44.1 S/m was achieved with a SCF loading of 4 wt%. A fiber contact model was proposed to predict the electrical conductivity of the composites. The PDMS/SCF composites were tested for conductive electrodes and flexible pressure sensors. The present work provides a facile method for continuous fabrication of conductive elastomeric composites, with potential for continuous fabrication of thermosetting composites.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | |||||||||
Library of Congress Subject Headings (LCSH): | Elastomers , Elastomers -- Electric properties, Conducting polymers, Composite materials -- Electric properties, Electric conductivity | |||||||||
Journal or Publication Title: | Composites Science and Technology | |||||||||
Publisher: | Pergamon | |||||||||
ISSN: | 0266-3538 | |||||||||
Official Date: | 8 February 2022 | |||||||||
Dates: |
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Volume: | 218 | |||||||||
Article Number: | 109155 | |||||||||
DOI: | 10.1016/j.compscitech.2021.109155 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 24 November 2021 | |||||||||
Date of first compliant Open Access: | 18 November 2022 | |||||||||
RIOXX Funder/Project Grant: |
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