A tin-containing liquid crystalline polymer with two glass temperatures

A tin-containing liquid crystalline side group polymer was synthesized and characterized. Two glass transitions were detected by calorimetric investig ations. The X-ray pattern corresponds to a smectic C order of the side grou ps and a disordered isotropic main chain. Dielectric measurements show two relaxation ranges which are influenced by the glass transitions and a fast local process. The low frequency mechanism can be related to the reorientat ion of the side groups and the higher glass transition temperature. The sec ond is connected with the alpha-relaxation of the main chain and freezes in at lower temperatures.