Thermodynamic Phasing of a Glass Transition of Amorphous Polymers

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F06%3A63504646" target="_blank" >RIV/70883521:28110/06:63504646 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Thermodynamic Phasing of a Glass Transition of Amorphous Polymers

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. The original model is modified by replacing the stretched exponential 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.

Czech name

Termodynamické fázování v teplotě skelného přechodu

Czech description

Tento článek presentuje data pro PMMA v průběhu ohřevu z teplot pod Tg po relaxaci po různě dlouhé relaxaci pod Tg. Model popisující tato mechanická a termální data zahrnuje nelineární viskoeleatické chování ve spolupráci s kooperativním relaxačním modelem a KWW rovnicí. Tento modifikovaný postup ukazuje dobrou shodu experimentálních dat s teorií. také píky v koeficientu teplotní roztažnosti a cp mohou být popsány.

Type

D - Article in proceedings

CEP classification

JJ - Other materials

OECD FORD branch

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Project

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Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2006

Confidentiality

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

Article name in the collection

Polymer Processing Society 22nd Annual Meeting PPS

ISBN

4-9093109-2-6

ISSN

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e-ISSN

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Number of pages

1

Pages from-to

1-1

Publisher name

Polymer Processing Society

Place of publication

Akron

Event location

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Event date

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Type of event by nationality

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UT code for WoS article

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