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Effects of crosslinking reaction and extension strain on the electrical properties of silicone rubber/carbon nanofiller composites
Author(s) -
Song Pan,
Wu Jian,
Wang Ge,
Zhang Yong
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50727
Subject(s) - materials science , composite material , carbon black , composite number , silicone rubber , curing (chemistry) , carbon nanotube , electrical conductor , graphene , elastomer , elongation , natural rubber , electrical resistivity and conductivity , gauge factor , viscoelasticity , ultimate tensile strength , fabrication , nanotechnology , medicine , alternative medicine , engineering , pathology , electrical engineering
Stretchable conductive silicone rubber (SR) composites are important in wearable electronic devices and the crosslinking of SR composites is necessary for their applications. But the effect of the crosslinking reaction on the electrical conductivity of SR composites is rarely reported. In this article, the effect of crosslinking reaction on the electrical conductivity of SR composites filled with conductive carbon black, carbon nanotubes, and graphene are studied. The crosslink density of SR composites increases with increasing curing time, but the electrical conductivity decreases sharply at the early stage of crosslinking, especially for SR/conductive carbon black composite, which is ascribed to the reaggregation of conductive nanofillers in SR during the crosslinking process. The elastic modulus of the three SR composites gradually increases while the elongation at break decreases with increasing curing time, and the SR/carbon black composite shows ultra‐high elongation at break (1578%). In addition, SR/graphene composite is more sensitive to the extension strain than SR/carbon black and SR/carbon nanotubes composites, and its gauge factor is 414 at the strain ranges of 3–25%. This research work brings a new method to optimize the crosslinking structure of conductive SR composites.