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Vliv doby stárnutí na objemovou a entalpickou odezvu v oblasti Tg u PMMA při jeho ohřevu

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dc.title Vliv doby stárnutí na objemovou a entalpickou odezvu v oblasti Tg u PMMA při jeho ohřevu cs
dc.title Effect of aging time on the volumetric and enthalpic glass transition of a-PMMA upon heating en
dc.contributor.author Říha, Pavel
dc.contributor.author Hadač, Jiří
dc.contributor.author Sáha, Petr
dc.contributor.author Rychwalski, Rodney
dc.contributor.author Kubát, Josef
dc.contributor.author Slobodian, Petr
dc.relation.ispartof Polymer
dc.identifier.issn 0032-3861 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2007
utb.relation.volume 48
utb.relation.issue 25
dc.citation.spage 7356
dc.citation.epage 7363
dc.type article
dc.language.iso en
dc.publisher Pergamon Elsevier Science Ltd. en
dc.identifier.doi 10.1016/j.polymer.2007.09.007
dc.relation.uri https://www.sciencedirect.com/science/article/pii/S0032386107009032
dc.subject PMMA cs
dc.subject skelný přechod cs
dc.subject stárnutí cs
dc.subject cooperativní model cs
dc.subject PMMA en
dc.subject Glass transition en
dc.subject Aging en
dc.subject Cooperative relaxation model en
dc.description.abstract Objemová a entalpická odezva PMMA v průběhu ohřevu přes Tg region je měřena jako funkce doby relaxace pod Tg. Modelování je založeno na nedávno vyvinutém termodynamickém modelu postaveném na nelineární viskoelastické teorii (Caruthers JM, et al. Polymer 2004;45:4577-4597; Adolf DB, et al. Polymer 2004;45:4599-4621). Tento model byl doplněn o operativní model. Tyto odezvy jsou dobře popsány co do vlastní polohy i velikosti. cs
dc.description.abstract In this paper we model 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 modeling is based on a recently developed thermodynamically consistent non-linear viscoelastic theory of thermal and mechanical behavior of glassy polymers in the glass transition range (Caruthers JM, et al. Polymer 2004;45:4577-4597 en
dc.description.abstract Adolf DB, et al. Polymer 2004;45:4599-4621). The original model is modified by replacing the stretched exponential by 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 modified 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. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1000819
utb.identifier.rivid RIV/70883521:28110/07:63505435
utb.identifier.obdid 16553040
utb.identifier.scopus 2-s2.0-36248978199
utb.identifier.wok 000251895600015
utb.source j-riv
utb.contributor.internalauthor Hadač, Jiří
utb.contributor.internalauthor Sáha, Petr
utb.contributor.internalauthor Kubát, Josef
utb.contributor.internalauthor Slobodian, Petr
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