Article Dans Une Revue Journal of Sol-Gel Science and Technology Année : 2012

Organic–inorganic tandem route to polymer nanocomposites: kinetic products versus thermodynamic products

Résumé

We report a facile single-step photochemical methodology to afford alkylsiloxane-polymer hybrid films which relies on the tandem photoacid-catalyzed polymerization of n-alkyltrimethoxysilane precursors and a diglycidyl ether organic monomer. Photoacids liberated by the UV decomposition of iodonium salt triggers simultaneously the sol-gel process and epoxy cationic polymerization. Such conditions are intended to favour the formation of kinetic products trapped by cross-linking reactions instead of the thermodynamically most stable structures, whose preference would be for macrophase segregation. Organosilane precursor exhibiting different structures and chain lengths (n-butyl, n-octyl, n-dodecyl, n-hexadecyl, isobutyl and isooctyl) were systematically investigated to afford a range of transparent alkylsiloxane-polyether hybrids. The competitive organic-inorganic reaction kinetics were investigated using in situ real-time Fourier transform infrared spectroscopy. A main emphasis has been on discussing the effect of the alkyl substituent structure on the photoinduced polymerization kinetics and the silicate networks characterized by Si-29 solid-state NMR. To avoid phase separation, the rate of formation of the two phases was tailored to favour concomitancy upon modulating several experimental parameters: film thickness, alkyl structure, photoacid generator concentration. Finally, the viscoelastic and surface properties were also assessed by dynamic mechanical analysis and water contact angle measurements, respectively.

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Dates et versions

hal-04383911 , version 1 (09-01-2024)

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Citer

Lingli Ni, Nadia Moreau, Abraham Chemtob, Celine Croutxe-Barghorn. Organic–inorganic tandem route to polymer nanocomposites: kinetic products versus thermodynamic products. Journal of Sol-Gel Science and Technology, 2012, 64 (2), pp.500-509. ⟨10.1007/s10971-012-2882-8⟩. ⟨hal-04383911⟩
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