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Epoxy-silica hybrids by nonaqueous sol-gel process
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SYSNO ASEP 0397559 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Epoxy-silica hybrids by nonaqueous sol-gel process Tvůrce(i) Ponyrko, Sergii (UMCH-V) RID, ORCID
Kobera, Libor (UMCH-V) RID, ORCID
Brus, Jiří (UMCH-V) RID, ORCID
Matějka, Libor (UMCH-V) RIDZdroj.dok. Polymer. - : Elsevier - ISSN 0032-3861
Roč. 54, č. 23 (2013), s. 6271-6282Poč.str. 12 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova epoxy-silica hybrid ; nonaqueous sol-gel process ; gelation Vědní obor RIV CD - Makromolekulární chemie CEP GAP108/12/1459 GA ČR - Grantová agentura ČR Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000326140800002 DOI 10.1016/j.polymer.2013.09.034 Anotace The epoxy-silica hybrids have been prepared by the non-aqueous sol–gel process and the in situ generation of nanosilica from tetraethoxysilane was initiated with borontrifluoride monoethylamine (BF3MEA). The DGEBA based epoxy networks with aliphatic, cycloaliphatic and aromatic amines were used as matrices. The solventless technique made it possible to avoid drawbacks of the classical aqueous procedure. The “non-aqueous” systems show improved homogeneity and thermomechanical properties in particular at the application of the coupling agent glycidyloxypropyl trimethoxysilane. Mechanism of the non-aqueous sol–gel process under BF3MEA action and evolution of the hybrid structure during polymerization, followed by chemorheology, are discussed. The nanosilica structure growth is slower under the non-aqueous procedure thus facilitating a better structure control. The hybrids with both particulate and bicontinuous morphologies were prepared and the epoxy-silica interphase bonding and crosslinking through the formed silica domains was proved. The hybrid hierarchical structure and morphology were determined by NMR, SAXS, TEM and DMA. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2014
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