Počet záznamů: 1  

Epoxy-silica hybrids by nonaqueous sol-gel process

  1. 1. 0397559 - UMCH-V 2014 RIV GB eng J - Článek v odborném periodiku
    Ponyrko, Sergii - Kobera, Libor - Brus, Jiří - Matějka, Libor
    Epoxy-silica hybrids by nonaqueous sol-gel process.
    Polymer. Roč. 54, č. 23 (2013), s. 6271-6282 ISSN 0032-3861
    Grant CEP: GA ČR GAP108/12/1459
    Grant ostatní:AV ČR(CZ) M200500903
    Institucionální podpora: RVO:61389013
    Klíčová slova: epoxy-silica hybrid * nonaqueous sol-gel process * gelation
    Kód oboru RIV: CD - Makromolekulární chemie
    Impakt faktor: 3.766, rok: 2013

    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.
    Trvalý link: http://hdl.handle.net/11104/0226331