Time-temperature and time-stress correspondence in nonlinear creep. Experimental behaviour of amorphous polymers and quantitative modelling approaches

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abstract

Non-linear creep is described by a non-simulative, analytical, dynamic molecular modelling approach. Elementary, molecular-scale, process-relevant frequencies are derived by adequate kinetic formulation. They follow almost exactly an Arrhenius-like behaviour with a range of activation enthalpies. Their relative contribution to the overall macroscopic behaviour of the materials is quantified to account for the materials' retardation time spectra and final non-Arrhenius behaviour. A new creep compliance equation is derived, yielding a fully coupled time-temperature-stress formulation, with long-term predictive capability. Experimental data for poly(methyl methacrylate) are analysed to identify the extent to which time-temperature and the time-stress correspondence relationships may be valid, and it is shown that they are approximations (especially the latter), limited to narrow ranges of experimental variables, in contrast to the proposed model, which more reasonably fits the experimental behaviour.

keywords

SHORT-TERM TESTS; SHIFT FACTOR; SERVICE PERFORMANCE; RELAXATION; PREDICTION; POLYETHYLENE; ORIENTATION; EQUATION; TENSILE

subject category

Polymer Science

authors

Andre, JRS; Pinto, JJCC

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Publication Details

type
Journal Article
year
2004
journal
E-POLYMERS
article number
079
publisher
EUROPEAN POLYMER FEDERATION
issn
1618-7229
web of science article identifier
WOS:000225729700001

Journal Metrics (JCR 2019)

Journal Impact Factor
1.675
Journal Impact Factor (5 yrs)
1.481
category normalized journal percentile
39.888

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