Simultaneous Volume and Enthalpy Relaxation Response Initiated by Temperature Down-Jump

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F06%3A63504623" target="_blank" >RIV/70883521:28110/06:63504623 - 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

Simultaneous Volume and Enthalpy Relaxation Response Initiated by Temperature Down-Jump

Original language description

The volume and enthalpy relaxation, so called structural relaxation or physical aging phenomenon were measured after temperature down-jump from equilibrium above glass transition temperature to glassy state. The tested materials were PMMA, PS, amorphousPET and PMMA filled with carbon black. Mercury-in-Glass Dilatometer was employed for volume relaxation measurements and Perkin-Elmer DSC 1 Pyris was used for enthalpy relaxation measurements. The relaxation data were collected from minutes after temperature jump to nearly a month. It was found that enthalpy and volume relax by very similar way, which means that constant relationship between both quantities can be found defined one time independent ratio over relaxation times of above described experimental window. It was found that its value is close to the inversion value of compressibility measured by direct compression giving value for tested polymers to be around 2GPa.

Czech name

Společná objemová a entalpická relaxační odezva iniciovaná teplotním sestupným skokem

Czech description

Objemová a entalpická relaxace po teplotním sestupném skoku byla měřena pro PS, PMMA, PET a PMMA plněné sazemi. Rtuťová dilatometrie a DSC byly použity pro měření objemu a entalpie. Bylo zjištěno, že obě veličiny relaxují podobně s možností nalezení jejich konstantního poměru. Ten je pro polymery kolem 2GPa, blízko kompresibilitě v tavenině.

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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