Summary Organic-inorganic nanocomposite hybrid coatings were prepared through a dual-cure process involving free-radical and cationic
photopolymerization of a methacrylic-epoxy functionalized resin and subsequent condensation of organo-alkoxysilane inorganic
precursor. All the formulations investigated gave rise to photocured films characterized by a high gel content values. A lower
decrease on glass transition temperature is observed in the presence of MEMO or GPTS compared with a monofunctional methacrylic
monomer. The dual-cured hybrid films were optically transparent evidencing that the organic-inorganic phase separation is
in the scale of smaller than 400 nm. The formation of nanometric size inorganic domains (in the range between 10–30 nm), both
in the presence of MEMO or GPTS as silica precursor, were further confirmed by TEM analysis. 相似文献
Hybrid nanocomposite coatings were prepared by the UV‐curing technique with a methacrylic oligomer and multifunctional methacrylic polyhedral oligomeric silsesquioxane blocks (POSS®). The results obtained from the polyhedral compounds were compared with those of a disordered framework obtained by the condensation of a silica precursor (MEMO). The inorganic domains generated during synthesis created constraints in movement of polymer segments, which reflected in an increase in Tg of the hybrid nanocomposite coatings. The films were transparent. The random structure obtained by the condensation of the MEMO showed a stronger effect on Tg than that observed by introducing POSS®. The effect of inorganic domains reflected on thermal stability, surface hardness and mechanical properties of the hybrid nano‐composite coatings.
