Entalpická relaxace PS a PMMA s rozdílnými molekulárními parametry

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F04%3A63502707" target="_blank" >RIV/70883521:28110/04:63502707 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Enthalpy Relaxation of PS and PMMA with different molecular weight paramethers

Popis výsledku v původním jazyce

Enthalpy relaxation of PS and PMMA were measured after temperature down-jumps from the equilibrium state of the material above Tg to temperatures close below Tg. All temperature history of the samples and also final temperature up-scan of relaxed sampleswere performed on DSC 1 Pyris from Perkin-Elmer. Polymer samples with different molecular weight parameters, such as molecular weight and molecular weight distribution were prepared by precipitation of the corresponding material. Enthalpy relaxation isotherms were fitted by Tool-Narayanaswamy-Moynihan (TNM) model. The influence of molecular weight on relaxation response is discussed through TNM parameters, such as apparent activation energy for structural relaxation, non-linearity parameter and stretching exponent. Further discussion is carried out in terms of enthalpy relaxation rate calculated from relaxation isotherms in the region where relaxation data varies linearly with logarithm of relaxation time.

Název v anglickém jazyce

Enthalpy Relaxation of PS and PMMA with different molecular weight paramethers

Popis výsledku anglicky

Enthalpy relaxation of PS and PMMA were measured after temperature down-jumps from the equilibrium state of the material above Tg to temperatures close below Tg. All temperature history of the samples and also final temperature up-scan of relaxed sampleswere performed on DSC 1 Pyris from Perkin-Elmer. Polymer samples with different molecular weight parameters, such as molecular weight and molecular weight distribution were prepared by precipitation of the corresponding material. Enthalpy relaxation isotherms were fitted by Tool-Narayanaswamy-Moynihan (TNM) model. The influence of molecular weight on relaxation response is discussed through TNM parameters, such as apparent activation energy for structural relaxation, non-linearity parameter and stretching exponent. Further discussion is carried out in terms of enthalpy relaxation rate calculated from relaxation isotherms in the region where relaxation data varies linearly with logarithm of relaxation time.

Druh

D - Stať ve sborníku

CEP obor

BJ - Termodynamika

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2004

Kód důvěrnosti údajů

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

Název statě ve sborníku

ICTAC 13

ISBN

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ISSN

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e-ISSN

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Počet stran výsledku

1

Strana od-do

46

Název nakladatele

Associazione Italiana di Calorimetria e Analisi Termica

Místo vydání

Baia Chia

Místo konání akce

Baia Chia,Itálie

Datum konání akce

12. 11. 2004

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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