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Impression recovery of PMMA

Published online by Cambridge University Press:  31 January 2011

Fuqian Yang  and
J. C. M. Li
Fuqian Yang
Affiliation:
Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627
J. C. M. Li
Affiliation:
Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627
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Abstract

Impression recovery in which the deformation temperature is the same as recovery temperature is studied for the first time. PMMA is deformed by impression above the glass transition temperature to a depth of less than 0.3 mm and recovered at the same temperature. Almost complete recovery of dimension is observed every time. The dimensional changes obey second order kinetics and the temperature dependence of the rate constant shows two consecutive processes with activation energies 440 kJ/mole (between 104 and 113 °C) and 95 kJ/mole (between 113 and 140 °C). Two pairs of defects of opposite signs are believed to be involved in the dimensional recovery processes.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 10 , October 1997 , pp. 2809 - 2814
Copyright
Copyright © Materials Research Society 1997

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