Polymer Dynamics in Rubbery Epoxy Networks/Polyhedral Oligomeric Silsesquioxanes Nanocomposites

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F09%3A00207118" target="_blank" >RIV/00216208:11320/09:00207118 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389013:_____/09:00325697

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Polymer Dynamics in Rubbery Epoxy Networks/Polyhedral Oligomeric Silsesquioxanes Nanocomposites

Popis výsledku v původním jazyce

Dielectric techniques - thermally stimulated depolarization currents and broadband dielectric relaxation spectroscopy togheter with differential scanning calorimetry were employed, to investigate molecular dynamics in rubbery epoxy networks, modified with polyhedral oligomeric silsesquioxanes units covalently bound to the chains. Four relaxations were detected and analyzed: two local, secondary relaxations in the glassy state, the segmental relaxation associated with the glass transition and the normalmode relaxation, related with the presence of a dipole moment component along the Jeffamine chain contour. Obtained results suggest that a fraction of polymer is immobilized, probably at interfaces with POSS, due to constraints imposed by the covalentlybound rigid nanoparticles, whereas the rest exhibits a slightly faster dynamics due to increaseof free volume.

Název v anglickém jazyce

Polymer Dynamics in Rubbery Epoxy Networks/Polyhedral Oligomeric Silsesquioxanes Nanocomposites

Popis výsledku anglicky

Dielectric techniques - thermally stimulated depolarization currents and broadband dielectric relaxation spectroscopy togheter with differential scanning calorimetry were employed, to investigate molecular dynamics in rubbery epoxy networks, modified with polyhedral oligomeric silsesquioxanes units covalently bound to the chains. Four relaxations were detected and analyzed: two local, secondary relaxations in the glassy state, the segmental relaxation associated with the glass transition and the normalmode relaxation, related with the presence of a dipole moment component along the Jeffamine chain contour. Obtained results suggest that a fraction of polymer is immobilized, probably at interfaces with POSS, due to constraints imposed by the covalentlybound rigid nanoparticles, whereas the rest exhibits a slightly faster dynamics due to increaseof free volume.

Druh

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

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/IAA400500701" target="_blank" >IAA400500701: Nanostrukturní organicko-anorganické polymery</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2009

Kód důvěrnosti údajů

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

Název periodika

Journal of Applied Polymer Science

ISSN

0021-8995

e-ISSN

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Svazek periodika

113

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

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Kód UT WoS článku

000266945300061

EID výsledku v databázi Scopus

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