Volume and enthalpy relaxation in a-PMMA after temperature up-jumps |
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Authors: | Slobodian P Lengálová A Sáha P |
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Institution: | (1) Faculty of Technology, Polymer Centre, Tomas Bata University in Zlín, T.G.M. 275, 762 72 Zlín, Czech Republic |
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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.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | enthalpy relaxation volume relaxation a-PMMA memory effect physical aging |
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