화학공학소재연구정보센터
Journal of Polymer Science Part B: Polymer Physics, Vol.32, No.5, 871-880, 1994
Sub-T(G) Molecular Motions in Glassy Poly(Vinyl Chloride) - Influence of the Nucleophilic-Substitution
Dielectric local molecular motions in the glass transition region of poly(vinyl chloride) (PVC) have been investigated by means of the isothermal depolarization currents technique. Attention is paid to the influence of the modification of the polymer by the substitution of chlorine atoms of PVC chain by the benzenethiolate group. The results are well described by stretched exponential laws. According to the Ngai’s coupling model, the coupling between moving units as well as the activation energy responsible for the motions occurring at primitive level have been calculated for each sample at each temperature. All these parameters are noticeably altered by the modification of PVC.