Journal of Thermal Analysis and Calorimetry

, Volume 71, Issue 2, pp 387–393 | Cite as

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

  • P SlobodianEmail author
  • A Lengálová
  • P Sáha


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, Ka. This method is applied to aging following temperature up-jumps after consolidation periods of varying lengths. the main finding is a marked increase of Ka with consolidation time, approaching a limiting value in an asymptotic fashion.

enthalpy relaxation volume relaxation a-PMMA memory effect physical aging 


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Copyright information

© Kluwer Academic Publishers/Akadémiai Kiadó 2003

Authors and Affiliations

  1. 1.Faculty of Technology, Polymer CentreTomas Bata University in ZlínZlín, Czech Republic

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