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Volume and enthalpy recovery of glass-forming polymers and the predictions controlled by internal energy
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SYSNO ASEP 0325985 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Volume and enthalpy recovery of glass-forming polymers and the predictions controlled by internal energy Title Vliv doby stárnutí na změnu objemu a entalpie a-PMMA při skelném přechodu po ohřátí Author(s) Říha, Pavel (UH-J) SAI, ORCID, RID
Slobodian, P. (CZ)
Kubát, J. (SE)Source Title Acta Technica CSAV. - : Ústav termomechaniky AV ČR, v. v. i. - ISSN 0001-7043
Roč. 54, č. 1 (2009), s. 59-71Number of pages 13 s. Language eng - English Country CZ - Czech Republic Keywords a-PMMA ; Glass transition ; Aging ; Cooperative relaxation model Subject RIV BK - Fluid Dynamics R&D Projects IAA200600803 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20600510 - UH-J (2005-2011) Annotation In the paper we describe the volumetric and enthalpic response of a-PMMA during heating at constant rate through the glass transition region following an aging period of varying length. The description employs a relaxation function based on a cooperative model where the elementary events tend to occur in clusters due to mutual induction reminiscent of the mechanism underlying B-E statistics. The approach is found to produce good agreement with the observed temperature dependence of specific volume and enthalpy. Also the peaks in thermal expansivity and heat capacity are well described, both with regard to their intensity and position along the temperature axis. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2009
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