Enthalpy relaxation studies in isotactic polystyrene. Effects of crystallinity

Summary The enthalpy relaxation of the amorphus isotactic polystyrene is strongly affected from the crystalline phase induced by annealing at temperatures between Tg and Tm. All the parameters describing the relaxation process, H, T_max and T_ons depend also on the above T_g annealing conditions as the induced crystallinity alters the quantity and the quality (i.e.Tg, T_gons, T_g) of the remaining amorphous phase.