Scratch resistance of nano-silica reinforced acrylic coatings

Abstract Organic–inorganic hybrid coatings were obtained by a dual-curing process combining the sol–gel reaction with the UV-induced polymerization technique by starting from bisphenol A ethoxylate (15 EO/phenol) dimethacrylate (BEMA, as organic network former), methacryloyloxypropyl-trimethoxysilane (MEMO, as coupling agent) and tetraethoxysilane (TEOS, as inorganic silica network precursor). For comparison, TEOS was also substituted with preformed silica nanoparticles. Scratch test was carried out in order to study the scratch resistance of that silica reinforced acrylic resins. Excellent scratch resistant coatings were obtained by UV and sol–gel dual curing process. On the contrary, coatings with very poor scratch resistance were obtained by dispersing preformed nano-silica into the acrylic resin indicating the key role played by the morphology of the inorganic filler and its interaction with the organic matrix.

[1]  P. Fabbri,et al.  Sol–gel derived hybrid coatings for the improvement of scratch resistance of polyethylene , 2007 .

[2]  H. Schmidt,et al.  The Sol-Gel Process as a Basic Technology for Nanoparticle-Dispersed Inorganic-Organic Composites , 2000 .

[3]  Zhu Xiaoguang,et al.  Studies on nylon 6/clay nanocomposites by melt-intercalation process , 1999 .

[4]  J. Fouassier,et al.  Radiation curing in polymer science and technology , 1993 .

[5]  M. Sarkar,et al.  Synthesis and characterization of acrylic rubber/silica hybrid composites prepared by sol‐gel technique , 2004 .

[6]  A. Priola,et al.  Preparation and characterization of acrylic resin/titania hybrid nanocomposite coatings by photopolymerization and sol–gel process , 2006 .

[7]  A. Hult,et al.  Use and interpretation of scratch tests on ductile polymer coatings , 2003 .

[8]  S. Wongkasemjit,et al.  Sol-gel processing of silatranes , 2001 .

[9]  G. Malucelli,et al.  Hybrid nanocomposites containing silica and PEO segments: preparation through dual-curing process and characterization , 2005 .

[10]  P. Supaphol,et al.  Hard-coating materials for poly(methyl methacrylate) from glycidoxypropyltrimethoxysilane-modified silatrane via a sol–gel process , 2006 .

[11]  G. Wilkes,et al.  The Mechanism for 3-Aminopropyltriethoxysilane to Strengthen the Interface of Polycarbonate Substrates with Hybrid Organic–Inorganic Sol-Gel Coatings , 1997 .

[12]  G. Malucelli,et al.  Preparation and Characterization of Hyperbranched Polymer/Silica Hybrid Nanocoatings by Dual‐Curing Process , 2006 .

[13]  P. Fabbri,et al.  Poly(caprolactone)/silica organic-inorganic hybrids as protective coatings for poly(methyl methacrylate) substrates , 2003 .

[14]  Jean Pierre Pascault,et al.  Synthesis, structure, and morphology of polymer-silica hybrid nanocomposites based on hydroxyethyl methacrylate , 1999 .

[15]  G. Malucelli,et al.  Preparation and characterization of hybrid nanocomposite coatings by photopolymerization and sol-gel process , 2005 .

[16]  Jin-Who Hong,et al.  Photocuring kinetics of UV‐initiated free‐radical photopolymerizations with and without silica nanoparticles , 2005 .

[17]  P. Ajayan,et al.  Nanocomposite Science And Technology , 2003 .