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Stress Relaxation of Poly(ethylene Naphthalate): Isothermal, Isochronal and Isostructural Responses

Published

Author(s)

M L. Cerrada, G B. McKenna

Abstract

The physical aging response of polymers is generally examined in isothermal conditions by following the viscoelastic behavior as a function of aging time. It is then often asked if time-aging time superposition applies at a single temperature. If so, it can then be ascertained if time-temperature superposition applies to the aging time reduced curves obtained at different temperatures. In prior work from this laboratory we showed that isothermal time-aging time superposition did not apply to amorphous PEN. In this work we describe the surprising result that samples aged at 100 degrees C and then tested at 30 degrees C, 50 degrees C, 70 degrees C and 90 degrees C, that is iso-structurally (constant fictive temperature) seem to follow time-temperature superposition.
Conference Dates
May 1, 1999
Conference Location
Undefined
Conference Title
SPE Annual Technical Conference

Keywords

isostructural state, PEN, polymer glasses, relaxation process, time-aging time superposition, viscoelasticity

Citation

Cerrada, M. and McKenna, G. (2008), Stress Relaxation of Poly(ethylene Naphthalate): Isothermal, Isochronal and Isostructural Responses, SPE Annual Technical Conference, Undefined (Accessed April 20, 2024)
Created October 16, 2008