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The Craze Growth Response in Stress Relaxation Conditions for a Styrene-Acrylonitrile Copolymer During Physical Aging

Published

Author(s)

M Delin, G B. McKenna

Abstract

Craze growth has been studied as a function of time after a quench (physical aging) at four different temperatures between 22 degrees C and 60 degrees C. A styrene-acrylonitrile co-polymer (SAN) was tested in stress relaxation conditions. The craze length was found to grow linearly on a logarithmic loading time scale. A transition in the logarithmic growth rate was found to occur on the aging time scale. The transition was observed as a change in rate from high to approximately 5 times slower and occurred over a relatively narrow range of aging times. The growth rate in the slow growth regime was relatively insensitive to temperature for all four temperatures studied. The transition was found to move to shorter aging times as temperature increases. Although the craze length between crazes in a sample could differ to a large extent, the growth rates themselves, were found to vary by within a band, 20 % of the means.
Citation
Plasma Processes and Polymers

Keywords

creep, PEN, relaxation process, time-aging time superposition, viscoelasticity

Citation

Delin, M. and McKenna, G. (2008), The Craze Growth Response in Stress Relaxation Conditions for a Styrene-Acrylonitrile Copolymer During Physical Aging, Plasma Processes and Polymers (Accessed May 19, 2024)

Issues

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Created October 16, 2008