Differently-catalyzed silica-based precursors as functional additives for the epoxy-based hybrid materials

0461315 - ÚMCH 2017 RIV GB eng J - Journal Article
Perchacz, Magdalena - Beneš, Hynek - Zhigunov, Alexander - Serkis, Magdalena - Pavlova, Ewa
Differently-catalyzed silica-based precursors as functional additives for the epoxy-based hybrid materials.
Polymer. Roč. 99, 2 September (2016), s. 434-446. ISSN 0032-3861. E-ISSN 1873-2291
R&D Projects: GA ČR(CZ) GA14-05146S; GA MŠMT(CZ) LO1507
Institutional support: RVO:61389013
Keywords : epoxy-silica hybrid material * solvent-free sol-gel process * silica-based precursor
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 3.684, year: 2016

Two types of liquid pre-condensed silica-based precursors bearing epoxy groups were synthesized using the solvent-free sol-gel process of (3-glycidyloxypropyl)trimethoxysilane (GPTMS), in the presence of either basic (DABCO) or neutral (DBTL) catalyst, and further applied for modification of epoxy (DGEBA) – amine (Jeffamine™ D-230) glassy network. The prepared epoxy-silica hybrid materials were characterized by a set of methods including UV–vis, SAXS, TEM, AFM, DMTA, tensile tests, TGA and XRF. All hybrids were optically transparent regardless to the silica-based precursor type and its content showing an improvement mainly in dynamic shear storage modulus in rubbery region (up to 4.3 times), energy to break (up to similar to 62%), elongation at break (up to similar to 50%) and thermooxidative stability. The developed procedure is particularly suitable for preparation of fully-transparent massive bulk materials in which the presence of water and volatiles from the sol-gel is highly undesirable.
Permanent Link: http://hdl.handle.net/11104/0261206