Rigidní amorfní frakce u poly(ethylen tereftalátu) měřená dilatometricky

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F08%3A63507319" target="_blank" >RIV/70883521:28110/08:63507319 - 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

Rigid amorphous fraction in poly(ethylene terephthalate) determined by dilatometry

Popis výsledku v původním jazyce

Volumetric thermal analysis of semicrystalline poly(ethylene terephthalate), PET, with different content of crystalline phase was carried out using Mercury-in-Glass Dilatometry. The effect of crystals on the thermal properties of amorphous phase (glass transition temperature, Tg, thermal expansion coefficients, ?) were determined. At cold-crystallization (106°C, up to 4 hours), crystalline content of 2.4 - 25.3 vol.% was achieved. Increasing content of crystalline phase broadens the glass transition region and increases Tg. The change of thermal expansion coefficient during glass transition is lower than that predicted by the two-phase model, which indicates the presence of a third fraction ? rigid amorphous fraction (RAF), whose content steadily increases during crystallization. However, its relative portion (specific RAF) is significantly reduced. Further significant decrease in specific RAF appears after annealing at a higher temperature.

Název v anglickém jazyce

Rigid amorphous fraction in poly(ethylene terephthalate) determined by dilatometry

Popis výsledku anglicky

Volumetric thermal analysis of semicrystalline poly(ethylene terephthalate), PET, with different content of crystalline phase was carried out using Mercury-in-Glass Dilatometry. The effect of crystals on the thermal properties of amorphous phase (glass transition temperature, Tg, thermal expansion coefficients, ?) were determined. At cold-crystallization (106°C, up to 4 hours), crystalline content of 2.4 - 25.3 vol.% was achieved. Increasing content of crystalline phase broadens the glass transition region and increases Tg. The change of thermal expansion coefficient during glass transition is lower than that predicted by the two-phase model, which indicates the presence of a third fraction ? rigid amorphous fraction (RAF), whose content steadily increases during crystallization. However, its relative portion (specific RAF) is significantly reduced. Further significant decrease in specific RAF appears after annealing at a higher temperature.

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

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2008

Kód důvěrnosti údajů

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

Název periodika

Journal of Thermal Analysis and Calorimetry

ISSN

1388-6150

e-ISSN

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Svazek periodika

94

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

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Kód UT WoS článku

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EID výsledku v databázi Scopus

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