成果简介：Hardness and toughness are usually contradictive for sol-gel derived coatings. In this article, thick (~15 mm) silicon-oxo-dominated nanocomposite coatings with high transparency were fabricated by incorporation of 3-methacryloxypropyltrimethoxysilane (MPS)-modified silica alcosol into the moisture-curable polysiloxane oligomer and curing with aid of 3-aminopropyltriehtoxysilane (APS). Effects of MPS-to-SiO2 molar ratio, SiO2 nanoparticles content, APS dosage, and curing process on the mechanical properties were thoroughly investigated using a pencil hardness tester, a flexibility tester, and a nano-indentation tester. Simultanously enhanced hardness (pencil hardness: 7H, and microhardness: 626 MPa) and toughness (flexibility: 5 mm) was achieved for the coating prepared with appropriate MPS-to-SiO2 molar ratio (0.1:1), silica nanoparticles content (10 wt%), and APS dosage (30 wt%). Due to the aza-Michael reaction, further mechanical enhancement, namely, hardness (9H and 1087 MPa) and flexibility (10 mm), was amazingly exhibited with the optimized curing process. Such mechanical properties are really prominent and rarely reported in the sol-gel derived silicon-oxo coating at such low drying temperature (≤ 185 °C).
论文引用方式：Ting He, Shuxue Zhou*, Preparation of Tough Siloxane-oxo Coatings with Enhanced Hardness from Moisture-curable Polysiloxane and Silica Alcosol, Journal of Coatings Technology and Research, 2015, 12(4), 767-776
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