Dynamic mechanical spectroscopy has been combined with high‐resolution solid‐state 13C NMR to characterize the molecular motions responsible for the γ and β secondary relaxations in unsaturated polyester networks. In DEG networks the 7γ transition is assigned to restricted phenyl group rotation in the styrene cross‐links whereas the motion of molecular groups in the vicinity of the residual maleic double bonds account for the β transition.
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Mélot et al. (1994) studied this question.
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