'I2-doping' of 1,4-polydienes

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Title: 'I2-doping' of 1,4-polydienes
Author(s): Dai, Liming; Mau, Albert W. H.; Griesser, Hans J.; Winkler, David A.; Spurling, Thomas H.; Hong, Xiaoyin; Yang, Yongyuan; White, John W.
Abstract: The discovery, in 1988, that 'iodine-doped' rubber can conduct electricity attracted a great deal of interest [1,2]. However, it also generated some fundamental questions [2]: First, what is the mechanism from which the conductivity of 'I2-doped' rubbers arises? Second, why does cis-1,4-polybutadiene not become electrically conductive by 'I2-doping', but its trans-counterpart does? Third, what is the effect of 'I2-doping' and conductivity in the rubber component on rubber-containing conducting composites and/or copolymers? We have previously demonstrated that 'I2-doping' of cis-1,4-polyisoprene produces conjugated sequences of unsaturated double bonds in the polymer backbone, which confer conductivity. Recently, we have found that 'I2-doping' of cis-1,4-polybutadiene, unlike the trans-isomer, does not lead to the formation of conjugated sequences at room temperature - a finding which leads to the formation of conducting patterns through patterned photoisomerization of cis-1,4-polybutadiene films followed by 'I2-doping'. We have also observed, for the first time, the occurrence of 'I2-doping' of the polyisoprene component in polyisoprene-polyacetylene copolymers.
Publication type: Journal article
Source: Synthetic Metals, Vol. 69, issues 1-3: Proceedings of the International Conference on Science and Technology of Synthetic Metals (ICSM'94), Seoul, South Korea, 24-29 July 1994, pp. 563-566
Publication year: 1995
Keyword(s): Calculations; Computer simulation; Copolymers; Doping (additives); Elastomers; Iodine; Isomerisation; Molecular dynamics; Molecular orbital calculations; Photoisomerisation; Polyacetylenes; Polybutadienes; Polydienes; Polyisoprenes; Rubber; Rubber containing materials; Trans isomer; Unsaturated double bonds
Publisher: Elsevier Science
ISSN: 0379-6779
Publisher URL: http://dx.doi.org/10.1016/0379-6779(94)02570-O
Peer reviewed