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Authors
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Sangermano, M. ; Elsayed, H. ; Voit, B.
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Title
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Ethoxysilyl-modified hyperbranched polyesters as multifunctional coupling agents for expoxy-silicia hybrid coatings
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Date
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28.04.2011
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Number
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27322
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Abstract
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Partially ethoxysilyl-modified hyperbranched aliphaticaromatic polyesters (HBPs) were effectively used as toughening as well as multi-site coupling agents in the preparation of organicinorganic UV-thermal dual-cured epoxy/TEOS coatings. Through chain transfer reaction of the phenolic terminal units of the HBPs effective incorporation in the epoxy resin is achieved in the photo-initiated cationic polymerization whereas the ethoxysilane groups allow effective formation of a strongly interconnected inorganicorganics network during the in-situ sol-gel process with TEOS by binding the organic to the inorganic phase. Under those conditions, the addition of the inorganic precursor to the epoxy/HPB (20 wt%) system induced an increase of the storage modulus and more important, an improvement of the viscoelastic properties by extending the performance of the elastic modulus to higher temperatures. Thus, highly transparent hybrid coatings with enhanced thermal-mechanical and surface hardness properties resulted by the use of the partially ethoxysilyl-modified HBPs as multifunctional coupling agents.
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Publisher
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Polymer
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Wikidata
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Citation
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Polymer 52 (2011) 2103-2109
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DOI
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https://doi.org/10.1016/j.polymer.2011.03.047
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Tags
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hyperbranched polymers cationic photopolymerization organicinorganic hybrid coatings photoinitiated cationic-polymerization sol-gel process polymers photopolymerization additives monomers
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