PHYSICAL AGING OF POLY(METHYL METHACRYLATE) FROM ENTHALPY RELAXATION MEASUREMENTS

Authors
COWIE JMG FERGUSON R
Citation
Jmg. Cowie et R. Ferguson, PHYSICAL AGING OF POLY(METHYL METHACRYLATE) FROM ENTHALPY RELAXATION MEASUREMENTS, Polymer, 34(10), 1993, pp. 2135-2141
Citations number
19
Categorie Soggetti
Polymer Sciences
Journal title
Polymer → ACNP
ISSN journal
00323861
Volume
34
Issue
10
Year of publication
1993
Pages
2135 - 2141
Database
ISI
SICI code
0032-3861(1993)34:10<2135:PAOPMF>2.0.ZU;2-C
Abstract
The enthalpic ageing behaviour of poly(methyl methacrylate) was studie d by differential scanning calorimetry for several ageing temperatures , and ageing times up to 10(4) min. The data are interpreted in terms of both the phenomenological multiparameter model and the Cowie-Fergus on model. The phenomenological multiparameter model was found not to p rovide an adequate description of the enthalpic ageing process(es) occ urring in poly(methyl methacrylate). Problems encountered in defining the equilibrium glassy state by extrapolating from liquid enthalpy dat a are also discussed.