Dynamic Mechanical Measurement of Polyphenylsulfone (Radel)

摘要

The dynamic response of Polyphenylsulfone (Radel) was measured with the Rheometrics Mechanical Spectrometer in different modes: Torsional Bar, Tensile, 3 Point-Bending, and Parallel Plates. The measurements cover a temperature range from -150 C to 380 C. Two secondary transitions below the glass transition have been identified and their relaxation activation energies are evaluated. The region above the glass transition temperature was characterized by Parallel Plates measurement and a maximum similar to the liquid-liquid transition was observed. Viscosity in this region was also measured as a function of frequencies. A Master Curve was constructed from the Torsion and Parallel Plates data, and the frequency shift parameters were fitted to the WLF equation. (Author)