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Název: | Volume and enthalpy relaxation in a-PMMA after temperature up-jumps | ||||||||||
Autor: | Slobodian, Petr; Lengálová, Anežka; Sáha, Petr | ||||||||||
Typ dokumentu: | Recenzovaný odborný článek (English) | ||||||||||
Zdrojový dok.: | Journal of Thermal Analysis and Calorimetry. 2003, vol. 71, issue 2, p. 387-393 | ||||||||||
ISSN: | 1388-6150 (Sherpa/RoMEO, JCR) | ||||||||||
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DOI: | https://doi.org/10.1023/A:1022827104029 | ||||||||||
Abstrakt: | The volume and enthalpy relaxation in a-PMMA subjected to temperature jumps in T-g region has been analysed. The measured Hand Vdata were compared with respect to aging time and proportionality between them as a slope of (partial derivativeH/partial derivativeV)(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. | ||||||||||
Plný text: | http://www.springerlink.com/content/v5590109085w2532/ | ||||||||||
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