About glass transition in polymer-salt mixtures

Abstract

Glass transition temperatures of several polymers were determined in polymer-salt mixtures by differential scanning calorimetry (DSC). Experiments show variation in glass transition temperature (Tg) with salt content and constancy of change in heat capacity (ΔCP) with it. We discuss change in Tg in thermodynamic terms. Polymer-salt mixtures were prepared by solution casting method. Lithium perchlorate served as inorganic salt. Increase as well as decrease in Tg with salt content can be observed in range of low salt content. Beyond saturation of salt in the mixture, result of Tg shows phase decay into salt-rich and salt-poor phases.