Abstract
Nanostructured hybrid clearcoats were produced using sol–gel based organic/inorganic precursors. To this end, clearcoats containing mixtures of a network former (tetraethyl ortosilicate; TEOS) and a network modifier (methacryloxy propyltrimethoxysilane; MEMO) and their hydrolyzed forms were prepared. Scanning electron microscope and atomic force microscope were utilized in order to investigate the morphology of different sol–gel prepared films. The mechanical properties of the bulk and surface of the clearcoats were studied by dynamic mechanical thermal analysis and nanoindentation techniques. The scratch resistance of the hybrid clearcoats was also studied by a laboratory carwash simulator. Decrease in glass transition temperature (Tg), cross-linking density, hardness and elastic modulus were seen for the clearcoat composed of hydrolyzed network modifier combined with hydrolyzed and non-hydrolyzed network former. However, a reverse effect was seen when the hydrolyzed TEOS and non-hydrolyzed MEMO was used. No improvement was observed using hydrolyzed MEMO in the clearcoat composition. Generally, results revealed improved mechanical properties of the clearcoat when the hydrolyzed network former was used together with non-hydrolyzed MEMO. Greater phase separation and silica cluster formation were seen for the clearcoats loaded with hydrolyzed MEMO compared with hydrolyzed TEOS.
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Tahmassebi N, Moradian S, Ramezanzadeh B, Khosravi A, Behdad S (2010) Effect of addition of hydrophobic nano silica on viscoelastic properties and scratch resistance of an acrylic/melamine automotive clearcoat. Tribol Int 43:685–693
Yari H, Moradian S, Ramazanzade B, Kashani A, Tahmasebi N (2009) The effect of basecoat pigmentation on mechanical properties of an automotive basecoat/clearcoat system during weathering. Polym Degrad Stab 94:1281–1289
Nichols ME, Gerlock JL, Smith CA, Darr CA (1999) The effects of weathering on the mechanical performance of automotive paint systems. Prog Org Coat 35:153–159
Bertrand-Lambotte P, Loubet JL, Verpy C, Pavan S (2002) Understanding of automotive clearcoats scratch resistance. Thin Solid Films 420–421:281–286
Hara Y, Mori T, Fujitani T (2000) Relationship between viscoelasticity and scratch morphology of coating films. Prog Org Coat 40:39–47
Ramezanzadeh B, Mohseni M, Yari H, Sabbaghian S (2009) An evaluation of an automotive clear coat performance exposed to bird droppings under different testing approaches. Prog Org Coat 66:149–160
Ramezanzadeh B, Mohseni M, Yari H (2011) Studying the effects of the chemical structure of an automotive clearcoat on its biological degradation caused by tree gums. J Coat Technol Res 8(3):375–387
Amerio E, Fabbri P, Malucelli G, Messori M, Sangermano M, Taurino R (2008) Scratch resistance of nano-silica reinforced acrylic coatings. Prog Org Coat 62:129–133
Jardret V, Ryntz R (2005) Visco-elastic visco-plastic analysis of scratch resistance of organic coatings. JCT Res 2(8):591–598
Bauer DR (1982) Degradation of organic coatings. I. Hydrolysis of melamine formaldehyde/acrylic copolymer films. J Appl Polym Sci 27:3651–3662
Bauer DR (1994) Chemical criteria for durable automotive topcoats. J Coat Technol 66(835):57–65
Jalili MM, Moradian S, Dastmalchian H, Karbasi A (2007) Investigating the variations in properties of 2-pack polyurethane clear coat through separate incorporation of hydrophilic and hydrophobic nano-silica. Prog Org Coat 59:81–87
Ramezanzadeh B, Moradian S, Tahmasebi N, Khosravi A (2011) Studying the role of polysiloxane additives and nano-SiO2 on the mechanical properties of a typical acrylic/melamine clearcoat. Prog Org Coat 72(4):621–631
Allen NS, Edge M, Ortega A, Liauw CM, Stratton J, McIntyre RB (2002) Behaviour of nanoparticle (ultrafine) titanium dioxide pigments and stabilisers on the photooxidative stability of water based acrylic and isocyanate based acrylic coatings. Polym Degrad Stab 78(3):467–478
Shen X, Chena YC, Lin L, Lin CJ, Scantlebury D (2005) Study on a hydrophobic nano-TiO2 coating and its properties for corrosion protection of metals. Electrochim Acta 50:5083–5089
Torro-Palau AM, Fernandez-Garcıa JC, Orgiles-Barcelo AC, Martın-Martınez JM (2001) Characterization of polyurethanes containing different silicas. Int J Adhesion Adhesives 21(1):1–9
Presting H, König U (2003) Future nanotechnology developments for automotive applications. Mater Sci Eng C 23(6–8):737–741
Yahyaei H, Mohseni M, Bastani S (2011) Using Taguchi experimental design to reveal the impact of parameters affecting the abrasion resistance of sol–gel based UV curable nanocomposite films on polycarbonate. J Sol Gel Sci Technol 59:95–105
Ramezanzadeh B, Mohseni M, Karbasi A (2012) Preparation of sol–gel-based nanostructured hybrid coatings; part 1: morphological and mechanical studies. J Mater Sci 47:440–454
Hernandez-Padron G, Rojas F, Garcia-Garduno M, Canseco MA, Castano VM (2003) Development of hybrid materials consisting of SiO2 microparticles embedded in phenolic-formaldehydic resin polymer matrices. Mater Sci Eng A 355:338–347
Hsu YG, Chang LF, Wang CP (2004) Organic–inorganic hybrid materials based on the incorporation of nanoparticles of polysilicic acid (nPSA) with organic polymers: 2. Curing of unsaturated poly(amide-ester) resin in the presence of nPSA. Mater Sci Eng A 367:205–217
Castelvetro V, De Vita C (2004) Nanostructured hybrid materials from aqueous polymer dispersions. Adv Colloid Interface Sci 108:167–185
Messoria M, Tosellib M, Pilatia F, Fabbria E, Fabbria P, Busolia S, Pasqualia L, Nannarone S (2003) Flame retarding poly(methyl methacrylate) with nanostructured organic–inorganic hybrids coatings. Polymer 44:4463–4470
Omrani A, Afsar S, Safarpour MA (2010) Thermoset nanocomposites using hybrid nano TiO2–SiO2. Mater Chem Phys 122:343–349
Smith S, Mukundan P, Krishna Pillai P, Warrier KGK (2007) Silica–gelatin bio-hybrid and transparent nano-coatings through sol–gel technique. Non-hydrolytic sol–gel synthesis of epoxysilane-based inorganic–organic hybrid resins. Mater Chem Phys 103:318–322
Jana S, Lim MA, Baek IC, Kim CH, Seok SI (2008) Non-hydrolytic sol–gel synthesis of epoxysilane-based inorganic–organic hybrid resins. Mater Chem Phys 112:1008–1014
Miao X, Ben-Nissan B (2000) Microstructure and properties of zirconia-alumina naolaminate sol-gel coatings. J Mater Sci 35(2000):497–502
Ferchichi A, Calas-Etienne S, Smaihi M, Prévot G, Solignac P, Etienne P (2009) Relation between structure and mechanical properties (elastoplastic and fracture behavior) of hybrid organic–inorganic coating. J Mater Sci 44:2752–2758
Zhu Y, Sun DX, Zheng H, Wei M, Zhang LM (2007) Improvement in properties of epoxy-based electrophoretic coating by silica/polyurethane nanocomposites. J Mater Sci 42:545–550
Ballarre J, Jimenez-Pique E, Anglada M, Pellice SA, Cavalieri AL (2009) Mechanical characterization of nano-reinforced silica based sol–gel hybrid coatings on AISI 316L stainless steel using nanoindentation techniques. Surf Coat Technol 203:3325–3331
Chou TP, Chandrasekaran C, Limmer SJ, Seraji S, Wu Y, Forbess MJ, Nguyen C, Cao GZ (2001) Organic–inorganic hybrid coatings for corrosion protection. J Non Cryst Solids 290:153–162
Sanchez C, Soler-Illia GJDAA, Ribot F, Grosso D (2003) Design of functional nano-structured materials through the use of controlled hybrid organic-inorganic interfaces. Comptes Rendus Chim 6(8–0):1131–1151
Sanchez C, In M (1990) Molecular design of alkoxide precursors for the synthesis of hybrid organic-inorganic gels. J Non Cryst Solids 147–148:1–12
Schmidt H, Wolter H (1990) Organically modified ceramics and their applications. J Non Cryst Solids 121:428–435
Novakvak BM, Eksworth MW, Verrier C (1995) Nanostructural organic-inorganic hybrid materials synthesized through simultaneous processes. ACS Symp Ser 585:86–96
Frings S (1994) Organic-inorganic coatings: based on polyester resins and in situ formed silica, Ph. D Thesis, University of Endhoven, ISBN 90-2771-8
Xue G, Koenig JL, Wheeler DD, Ishida H (1983) Reinforcement mechanism of polyester-fiber-reinforced rubber: a model study. J Appl Polym Sci 28:2633–2646
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Ramezanzadeh, B., Mohseni, M. Preparation of sol–gel based nano-structured hybrid coatings: effects of combined precursor’s mixtures on coatings morphological and mechanical properties. J Sol-Gel Sci Technol 64, 232–244 (2012). https://doi.org/10.1007/s10971-012-2852-1
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DOI: https://doi.org/10.1007/s10971-012-2852-1