Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Temperature Shift Factors for the Segmental Relaxation of Polycarbonate Below the Glass Transition

Published

Author(s)

P A. O'Connell, G B. McKenna

Abstract

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.
Proceedings Title
ANTEC (Annual Technical Conference) of the Society of Plastics Engineers
Conference Dates
April 26-30, 1998
Conference Location
Undefined
Conference Title
Society of Plastics Engineers

Keywords

Arrhenius, glass forming liquids, glass transition, polycarbonate, polymer dynamics, segmental relaxation, WLF

Citation

O'Connell, P. and McKenna, G. (1998), 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)
Created April 30, 1998, Updated October 12, 2021