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Polysiloxane elastomers with bimodal chain-length distributions

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Abstract

Most elastomers are prepared by an adventitious, random cross-linking process and thus have a broad, unimodal distribution of network chain lengths. It is possible, however, to obtain materials of controlled chain-length distribution by restricting the reactivity of the chains to their ends, and then end linking these chains with a multi-functional reactant. The networks of this type that have proved to be of greatest interest consist of short chains end linked with long chains to yield abimodal distribution of network chain lengths. These bimodal networks have unusually high extensibility for their values of the modulus and ultimate strength, and thus considerable toughness. Most such elastometers have been prepared from chains of poly(dimethylsiloxane), by carrying out either a condensation reaction between hydroxyl-terminated chains and tetraethoxysilane, or an addition reaction between vinyl-terminated chains and a poly(methylhydrogen siloxane) oligomer. The present review discusses the preparation of such materials, the characterization of some of their properties, and the interpretation of these properties in terms of the molecular theories of rubberlike elasticity.

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  1. Department of Chemistry and the Polymer Research Center, The University of Cincinnati, 45221-0172, Cincinnati, Ohio

    J. E. Mark

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Mark, J.E. Polysiloxane elastomers with bimodal chain-length distributions. J Inorg Organomet Polym 4, 31–44 (1994). https://doi.org/10.1007/BF00684026

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  • DOI: https://doi.org/10.1007/BF00684026

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