Developments of Organic-Inorganic Hybrid Free Radical-Cationic Dual Cured Coatings

• Published in: Polymer bulletin (Berlin, Germany) Germany), 2008-01, Vol.59 (6), p.865-872
• Main Authors: Sangermano, M., Acosta Ortiz, R., Garcia Valdez, A.E., Berlanga Duarte, L., Amerio, E., Priola, A., Rizza, G.
• Format: Article
• Language: English
• Subjects: Alkoxysilanes; Applied sciences; Cations; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Coatings; Complex Fluids and Microfluidics; Composites; Condensation resins; Exact sciences and technology; Forms of application and semi-finished materials; Free radicals; Glass transition temperature; Nanocomposites; Organic Chemistry; Phase separation; Photopolymerization; Physical Chemistry; Polymer industry, paints, wood; Polymer Sciences; Precursors; Soft and Granular Matter; Technology of polymers
• ISSN: 0170-0839; 1436-2449
• DOI: 10.1007/s00289-007-0833-2

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.