Structure-property relationships in brittle polymer networks modified by flexible cross-links

Kripotou, S.; Pissis, P.; Kontou, E.; Fainleib, A.M.; Grygoryeva, O.; Bey, I.

Artykuł - szczegóły

Tytuł artykułu

Structure-property relationships in brittle polymer networks modified by flexible cross-links

Autorzy

Kripotou S. , Pissis P. , Kontou E. , Fainleib A.M. , Grygoryeva O. , Bey I.

Wybrane pełne teksty z tego czasopisma

Identyfikatory

Warianty tytułu

Konferencja

International Seminar Nanomaterials-Simulations and Experiments , Łódź, 15-16 April 2005

Języki publikacji

Abstrakty

Hybrid polycyanurate/polyoxytetramethylene glycol (PCN/PTMG) networks were prepared from PCN and PTMG (molar mass 1.000 g/mol) with 10, 20, 30 and 40 wt. % PTMG. The degree of incorporation of PTMG into the PCN network was determined by gel fraction measurements. Earlier morphological and thermal transition studies indicated a non-crystalline structure, considerable nanostructural heterogeneity and a wide dispersion of glass transition temperatures of the hybrid networks. The present paper reports on a continued investigation of structure-property relationships and employ dielectric techniques to focus on molecular dynamics. Two secondary relaxations of PCN, one secondary relaxation of PTMG and a single, broad ? relaxation (dynamic glass transition) were detected in the hybrids. The ? relaxation was studied in detail over wide ranges of temperature and frequency. The results were systematically analyzed in terms of time scale, relaxation strength and shape of the response, and are discussed in terms of plasticization, presence of nanostructural heterogeneities (composition fluctuations) and hybridization. A distinctly different behaviour, observed for the hybrid with 30% PTMG, is explained in terms of a more pronounced nanoheterogeneous structure. Finally, stress-strain measurements were performed and their results are discussed in terms of structure and molecular dynamics.

Słowa kluczowe

modified polycyanurate network polyoxytetramethylene glycol PTMG dielectric spectroscopy main relaxation

PTMG usieciowanie spektroskopia dielektryczna relaksacja polycyjanuran

Wydawca

De Gruyter

Czasopismo

Materials Science Poland

Rocznik

2006

Tom

Vol. 24, No. 2/2

Strony

477--492

Opis fizyczny

Bibliogr. 28 poz.

Twórcy

autor

Kripotou S.

autor

Pissis P.

autor

Kontou E.

autor

Fainleib A.M.

autor

Grygoryeva O.

autor

Bey I.

Department of Physics, National Technical University of Athens, Zografou Campus, 15780 Athens, Greece, ppissis@central.ntua.gr

Bibliografia

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Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-article-BPW1-0021-0070