The Glass Transition and Rheology of a Polystyrene Nanocomposite

摘要

Calorimetry, shear rheology, and dilatometry are used to characterize a polystyrene nanocomposite. Higher glass transition temperatures, both as a function of cooling rate and pressure, are found for the nanocomposite sample compared to the neat polystyrene. Pressure relaxation master curves are constructed by time temperature superposition, from which the time-dependent bulk modulus is calculated and compared to that of the neat polystyrene. In addition, dynamic shear moduli of both the nanocomposite sample and the neat polystyrene are measured using a commercial rheometer.