Structural relaxation of glass-forming polymers based on an equation for configurational entropy. II: Structural relaxation in polymethacrylates

The dependence of the heat capacity on temperature measured in DSC heating scans after different thermal histories in poly(methyl methacrylate), poly(ethyl methacrylate), and poly(butyl ethacrylate) is reported. These results are analyzed with the help of a phenomenological model for the evolution o...

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Bibliographic Details
Published in:Macromolecules 1995-08, Vol.28 (17), p.5878-5885
Main Authors: GOMEZ RIBELLES, J. L, MONLEON PRADAS, M, VIDAURRE GARAYO, A, ROMERO COLOMER, F, MAS ESTELLES, J, MESEGUER DUENAS, J. M
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Thermal and thermodynamic properties
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Summary:The dependence of the heat capacity on temperature measured in DSC heating scans after different thermal histories in poly(methyl methacrylate), poly(ethyl methacrylate), and poly(butyl ethacrylate) is reported. These results are analyzed with the help of a phenomenological model for the evolution of configurational entropy under arbitrary histories. The possibility of obtaining material parameters from the experimental results is discussed. The dependence of the relaxation times in equilibrium conditions on temperature is calculated for the three polymers and compared with the results of the main viscoelastic and dielectric relaxation processes reported in the literature. The width parameter of the Kohlrausch-Williams-Watts relaxation function is also calculated for the three polymers of this series.
ISSN:0024-9297
1520-5835