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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/67985874:_____/07:00093733

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CD - Makromolekulární chemie

OECD FORD obor

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Projekt

<a href="/cs/project/GA103%2F05%2F0803" target="_blank" >GA103/05/0803: Konstrukční stabilita stavebních prvků z termoplastů v rozsahu teplot do skelného přechodu</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2007

Kód důvěrnosti údajů

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

Název periodika

Polymer

ISSN

0032-3861

e-ISSN

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Svazek periodika

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Číslo periodika v rámci svazku

48

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

7356-7363

Kód UT WoS článku

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EID výsledku v databázi Scopus

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