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Volume and enthalpy relaxation in a-PMMA after temperature up-jumps

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Abstract

the volume and enthalpy relaxation in a-PMMA subjected to temperature jumps in tg region has been analysed. The measured H and V data were compared with respect to aging time and proportionality between them as a slope of (∂H/∂V)T dependencies has been found. According to previous works the slope was identified as an apparent bulk modulus, K a. This method is applied to aging following temperature up-jumps after consolidation periods of varying lengths. the main finding is a marked increase of K a with consolidation time, approaching a limiting value in an asymptotic fashion.

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Authors and Affiliations

  1. Faculty of Technology, Polymer Centre, Tomas Bata University in Zlín, T.G.M. 275, 762 72, Zlín, Czech Republic

    P Slobodian, A Lengálová & P Sáha

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  1. P Slobodian
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  2. A Lengálová
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  3. P Sáha
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Correspondence to P Slobodian.

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Slobodian, P., Lengálová, A. & Sáha, P. Volume and enthalpy relaxation in a-PMMA after temperature up-jumps. Journal of Thermal Analysis and Calorimetry 71, 387–393 (2003). https://doi.org/10.1023/A:1022827104029

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  • DOI: https://doi.org/10.1023/A:1022827104029

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