The photoelastic properties of polydimethylsiloxane rubbers |
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| Authors: | N. J. Mills D. W. Saunders |
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| Affiliation: | 1. Imperial Chemical Industries Limited Petrochemical &2. Polymer Laboratory The Heath Runcorn , Cheshire, England;3. College of Aeronautics Cranfield , Bedfordshire, England |
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| Abstract: | The temperature dependence of the optical anisotropy and of the mean square end-to-end distance of polydimethylsiloxane chains have been derived from photoelastic measurements. The rotational isomeric chain model, including the interaction of neighboring bond rotations, is insufficient to interpret the data completely. The non-Gaussian behavior of short-chain networks of polydimethylsiloxane is compared with the theoretical models of Treloar and Gotlib. Neither is found to be completely satisfactory. Crude estimates of the number of monomers per equivalent randomly jointed link are obtained, and the usefulness of the freely jointed chain model is discussed. |
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