Ionic liquid-silica precursors via solvent-free sol-gel process and their application in epoxy-amine network: a theoretical/experimental study

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F17%3A00474629" target="_blank" >RIV/61389013:_____/17:00474629 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1021/acsami.7b02631" target="_blank" >http://dx.doi.org/10.1021/acsami.7b02631</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acsami.7b02631" target="_blank" >10.1021/acsami.7b02631</a>

Result language

angličtina

Original language name

Ionic liquid-silica precursors via solvent-free sol-gel process and their application in epoxy-amine network: a theoretical/experimental study

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10404 - Polymer science

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

ACS Applied Materials and Interfaces

ISSN

1944-8244

e-ISSN

—

Volume of the periodical

9

Issue of the periodical within the volume

19

Country of publishing house

US - UNITED STATES

Number of pages

14

Pages from-to

16474-16487

UT code for WoS article

000401782500062

EID of the result in the Scopus database

2-s2.0-85019596517