Dynamic spring analysis and its application to the polystyrene melt relaxation

摘要

AbstractThe technique of dynamic spring analysis (DSA) was employed to obtain the storage and loss moduli of polystyrene samples in the glassy and rubbery regions of viscoelastic response. These results were compared with dynamic shear moduli from eccentric rotating disc experiments by time–temperature superposition to determine the degree and range of applicability of DSA. The storage moduli gave semiquantitative agreement over the rubbery region, while the loss moduli agreed over a narrower region of response. An apparent relaxation above the glass transition temperature of polystyrene was attributed to the evolution of solvent from the polymer–spring composite samples stud