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Ionic liquid-silica precursors via solvent-free sol-gel process and their application in epoxy-amine network: a theoretical/experimental study
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SYSNO ASEP 0474629 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Ionic liquid-silica precursors via solvent-free sol-gel process and their application in epoxy-amine network: a theoretical/experimental study Author(s) Perchacz, Magdalena (UMCH-V) RID
Donato, R. K. (BR)
Seixas, L. (BR)
Zhigunov, Alexander (UMCH-V) RID, ORCID
Konefal, Rafal (UMCH-V) RID, ORCID
Serkis-Rodzen, Magdalena (UMCH-V) RID
Beneš, Hynek (UMCH-V) RID, ORCIDSource Title ACS Applied Materials and Interfaces. - : American Chemical Society - ISSN 1944-8244
Roč. 9, č. 19 (2017), s. 16474-16487Number of pages 14 s. Language eng - English Country US - United States Keywords 3D POSS structures ; epoxy-silica hybrid material ; IL-silica precursor Subject RIV CD - Macromolecular Chemistry OECD category Polymer science R&D Projects GA17-08273S GA ČR - Czech Science Foundation (CSF) LO1507 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UMCH-V - RVO:61389013 UT WOS 000401782500062 EID SCOPUS 85019596517 DOI 10.1021/acsami.7b02631 Annotation This work describes the solvent-free sol–gel synthesis of epoxy-functionalized silica-based precursors in the presence of 1-butyl-3-methylimidazolium-based ionic liquids (ILs) containing different anions: chloride (Cl–) and methanesulfonate (MeSO3–). The IL-driven sol–gel mechanisms were investigated in detail using experimental characterizations (29Si NMR and ATR FTIR spectroscopy) and a theoretical computational method based on density functional theory (DFT). We observed complex IL influence on both hydrolysis and condensation steps, involving especially H-bonding and Coulomb coupling stabilization of the process intermediates. The obtained IL–silica precursors and their further xerogels were widely characterized (rheology measurements, MALDI TOF, 29Si NMR, ATR FTIR, and DFT simulation), which allowed observation of their precise silica structures and established their most energetically favorable conformations. The detected silica structures were dependent on the IL type and varied from highly condensed 3D cage-like to branched ladder-like and cyclic ones. The application of prepared IL–silica precursors as reinforcing additives into the epoxy–amine network led to an improvement in the organic/inorganic interphase interactions through chemical and physical bonding. Uniform and well-dispersed silica aggregates, in the size of approximately 30 nm, were formed when <= 6.8 wt % of each IL–silica precursor was applied into the epoxy–amine network. The use of imidazolium-based ILs contributed to a significant improvement in thermomechanical properties of hybrids and reduced their UV absorption ability compared to that of the reference matrix. All hybrids exhibited an increase in energy to break (up to approximately 53%), elongation at break (up to approximately 43%), shear storage modulus in the rubbery region (up to 4 times), and thermo-oxidative stability. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2018
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