Dynamics of local intramolecular mobility and dielectric relaxation processes in linear polyesters containing silbenzylidene fragments

Temperature-frequency characteristics of the dielectric absorption in polyesters with alternating stiff and flexible fragments linked by silbenzylidene groups were studied. In the bulk and in moderately diluted solutions of polysilbenzylidenes, the local mobility of an aromatic ester group adjacent to a flexible fragment of the repeating unit is more retarded as compared to the case of polysilarylene structural analogs. It is suggested that the observed effects are related to the electronic structures of both Si atom and the adjacent groups, which affect the chain conformation.