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Preparation of tough silicon-oxo coatings with enhanced hardness from moisture-curable polysiloxane and silica alcosol

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Abstract

Hardness and toughness are typically contradictive for sol–gel-derived coatings. In this article, thick (~15 μm) silicon-oxo-dominated nanocomposite coatings with high transparency were fabricated by incorporating 3-methacryloxypropyltrimethoxysilane (MPS)-modified silica alcosol into a moisture-curable polysiloxane oligomer and curing with the aid of 3-aminopropyltriehtoxysilane (APS). Effects of MPS-to-SiO2 molar ratio, SiO2 nanoparticle content, APS dosage, and curing process on the mechanical properties were thoroughly investigated using a pencil hardness tester, a flexibility tester, and a nanoindentation tester. The best properties were achieved by a coating with an MPS-to-SiO2 molar ratio of 0.1:1, a silica nanoparticle content of 10 wt%, and an APS dosage of 30 wt%. This coating demonstrated enhanced hardness (pencil hardness = 7H and microhardness = 626 MPa) and toughness (excellent flexibility of 5 mm in the mandrel bend test). Additional curing via aza-Michael addition between amino groups from APS and C=C groups from the polysiloxane oligomer can be accomplished at elevated temperatures. This enables further mechanical enhancement, namely hardness (9H and 1087 MPa), with adequate flexibility (10 mm). Such properties are superior to those reported for other sol–gel-derived silicon-oxo coatings produced at low drying temperatures.

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Authors and Affiliations

  1. Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Advanced Coatings Research Center of Ministry of Education of China, Fudan University, Shanghai, 200433, China

    Ting He & Shuxue Zhou

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  1. Ting He
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  2. Shuxue Zhou
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Correspondence to Shuxue Zhou.

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He, T., Zhou, S. Preparation of tough silicon-oxo coatings with enhanced hardness from moisture-curable polysiloxane and silica alcosol. J Coat Technol Res 12, 767–776 (2015). https://doi.org/10.1007/s11998-015-9676-1

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  • DOI: https://doi.org/10.1007/s11998-015-9676-1

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