Abstract
Wide-angle X-ray scattering (WAXS) data obtained at room temperature from bulk poly(dimethylsiloxane) is presented and compared with the scattering functions calculated for random single chains in which the skeletal bond rotation angles have been assigned according to the precepts of the rotational isomeric state (RIS) approximation. There are significant differences between experimental and calculated curves, which are not eliminated by the introduction of large thermal-like fluctuations of the bond rotation angles. It is suggested that the rotation states are delocalised in PDMS, as the scattering calculated for a chain with free rotation of the skeletal bonds provides a more satisfactory fit to the experimental data. The relevance of the RIS approach for describing the local conformation of polymer molecules is discussed and the need to sample the spatial distribution function of the chain at different scales is stressed.
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Mitchell, G., Odajima, A. The Local Conformation of Poly(dimethylsiloxane). Polym J 16, 351–357 (1984). https://doi.org/10.1295/polymj.16.351
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DOI: https://doi.org/10.1295/polymj.16.351
