Chain flow in thermo-stimulated creep experiments: application to poly(methyl methacrylate)

Chain flow in thermo-stimulated creep experiments: application to poly(methyl methacrylate)

Experimental data from thermo-stimulated creep (TSCr) spectrometry display a retardation mode in poly(methyl methacrylate) (PMMA) at T > T g (glass transition temperature). In this work an attempt is made to relate the restoring force involved during TSCr measurements beyond the glass transition...

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Bibliographic Details
Published in:Polymer (Guilford) Vol. 37; no. 12; pp. 2359 - 2365
Main Authors: Dufresne, A., Etienne, S., Perez, J., Demont, P., Diffalah, M., Lacabanne, C., Martinez, J.J.
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 1996
Elsevier
Subjects:
Applied sciences
chain flow
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
poly(methyl methacrylate)
Properties and characterization
Rheology and viscoelasticity
thermo-stimulated creep
chain flow
thermo-stimulated creep
poly(methyl methacrylate)
Temperature effect
Methyl methacrylate polymer
Experimental study
Molecular relaxation
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Summary:Experimental data from thermo-stimulated creep (TSCr) spectrometry display a retardation mode in poly(methyl methacrylate) (PMMA) at T > T g (glass transition temperature). In this work an attempt is made to relate the restoring force involved during TSCr measurements beyond the glass transition zone to the viscoelastic behaviour of the polymeric chains flowing in the entangled network. In order to determine the temperature dependence of the molecular relaxation time, or lifetime for monomer diffusion, τ mol, three different sources of viscoelastic measurements are used. The TSCr data are then mapped onto the Arrhenius diagram of log τ mol to deduce the corresponding terminal relaxation time, or flow time, τ flow. Comparison between the terminal relaxation time and the characteristic time of TSCr spectrometry shows that, during the temperature scan, the recovery of the frozen-in strain can be effectively well described by the long-range diffusion of macromolecular chains within the surrounding entanglement lattice.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(96)85346-8