Temperature Shift Factors for the Segmental Relaxation of Polycarbonate Below the Glass Transition
P A. O'Connell, G B. McKenna
Data are presented on the stress relaxation response of a polycarbonate under torsional load. Tests were performed for times long enough to attain the equilibrium viscoelastic response at temperatures from approximately Tg-17[degrees]C to Tg+3[degrees]C where Tg is the nominal glass transition temperature. The equilibration times ranged from less than 30 minutes near to Tg to twelve days at the lowest temperature. Time-temperature superposition was found to be applicable over the entire temperature range investigated. The temperature dependence of the logarithm of the temperature shift factors aT was found to deviate significantly from that expected from either universal WLF behavior or from extrapolation of literature data obtained above Tg for polycarbonate.
ANTEC (Annual Technical Conference) of the Society of Plastics Engineers
and McKenna, G.
Temperature Shift Factors for the Segmental Relaxation of Polycarbonate Below the Glass Transition, ANTEC (Annual Technical Conference) of the Society of Plastics Engineers, Undefined
(Accessed December 4, 2023)