Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 19, Pages 9939-9948Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm30830d
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Funding
- Grant Agency of the Czech Republic [P108/12/1459]
- Academy of Sciences of the Czech Republic [M200500903]
- National Council of Scientific and Technological Development (CNPq) of the Brazilian government
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Imidazolium ionic liquids (ILs) have the capacity to exert multiple functions as additives for the formation of epoxy-silica nanocomposites, via the simultaneous sol-gel process and epoxy network build-up. This study addresses the effect of ILs on the reinforcement of tensile properties in rubbery epoxy-silica nanocomposites, allowing property tailoring. The use of ILs together with the coupling agent 3-glycidyloxypropyltrimethoxysilane (GTMS) created a synergic action between physical and chemical interfacial bonding, enabling an increase in toughness without a considerable loss of stiffness. The best tensile property balance was obtained with IL 1-triethylene glycol monomethyl ether-3-methylimidazolium methanesulfonate and GTMS. The rubbery nanocomposite produced was remarkably both stiffer and tougher than the unmodified epoxy-silica system, displaying ca. 6 times higher modulus and tensile strength as well as more than 10 times higher energy to break.
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