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Thermal contraction and volume relaxation of amorphous polymers

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Abstract

Two experimental techniques are described for the determination of the change of specific volume of polymers with temperature and aging time, which allow measurements between − 160 °C and + 200 °C. Four technical amorphous polymers, PS, PVC, PMMA and PC have been investigated. Volume-temperature curves under constant rate of cooling are presented and interpreted with respect to relaxation processes known from other physical investigations. The rate dependence of dilatometric glass transition temperatures is compared with the time dependence of rheometric glass transition temperatures from shear creep data. Volume relaxation data at constant aging temperature are presented. Aging is found to proceed until very low temperatures in the glassy state for e.g. PMMA.

For polystyrene, a comparison is made between the predictions of a very simple theory of volume relaxation due to Kovacs with experimental data, using additional information from volume temperature curves and the time temperature shift of the shear creep transition. The theory predicts a rate of volume relaxation which is much lower than that found by experiment.

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Authors and Affiliations

  1. Polymer Department of the Institute of Material Sciences, University Erlangen-Nürnberg, Martensstr. 7, D-8520, Erlangen, FRG

    R. Greiner & F. R. Schwarzl

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  1. R. Greiner
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  2. F. R. Schwarzl
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Greiner, R., Schwarzl, F.R. Thermal contraction and volume relaxation of amorphous polymers. Rheol Acta 23, 378–395 (1984). https://doi.org/10.1007/BF01329190

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  • DOI: https://doi.org/10.1007/BF01329190

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