Effect of aging time on the volumetric and enthalpic glass transition of a-PMMA upon heating

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F07%3A63505435" target="_blank" >RIV/70883521:28110/07:63505435 - isvavai.cz</a>

Alternative codes found

RIV/67985874:_____/07:00093733

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Effect of aging time on the volumetric and enthalpic glass transition of a-PMMA upon heating

Original language description

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; 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 temperat

Czech name

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

Czech description

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. Polymer2004;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.

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CD - Macromolecular chemistry

OECD FORD branch

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Project

<a href="/en/project/GA103%2F05%2F0803" target="_blank" >GA103/05/0803: Engineering stability of thermoplastic construction parts in the temperature range to the glass transition</a><br>

Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2007

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Polymer

ISSN

0032-3861

e-ISSN

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Volume of the periodical

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Issue of the periodical within the volume

48

Country of publishing house

GB - UNITED KINGDOM

Number of pages

8

Pages from-to

7356-7363

UT code for WoS article

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EID of the result in the Scopus database

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