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On the α-relaxation in bulk polyoxymethylene

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Abstract

Values quoted forΔH α, the activation energy of the high temperatureα-relaxation in polyoxymethylene (POM), range from 20 to 92 kcal mol−1. This paper seeks to rationalize the discrepancy by remeasuringΔH α using time-temperature superposition of torsional creep and dynamic compliances for a POM specimen annealed at 160° C. Superposition of loss compliance curvesJ″ (ω, T) is possible over the range 20 to 120° C but creep compliance curvesJ(t, T) fail to superpose above about 70° C. The creep anomaly is explained in terms of the McCrum-Morris reduction equations in which the unrelaxed complianceJ U T increases with temperature more rapidly than the relaxed complianceJ R T. The activation energyΔH α has a constant value of 21±1 kcal mol−1 below about 70° C. Above about 70° C,ΔH α increases steadily up to 33±2 kcal mol−1 at 120° C.

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Author notes

  1. R. W. Gray

    Present address: Department of Electronics and Electrical Engineering, The University, Glasgow, Scotland

Authors and Affiliations

  1. Department of Engineering Science, Oxford University, Parks Road, Oxford, UK

    R. W. Gray

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Gray, R.W. On the α-relaxation in bulk polyoxymethylene. J Mater Sci 8, 1673–1689 (1973). https://doi.org/10.1007/BF00552176

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  • DOI: https://doi.org/10.1007/BF00552176

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