FT-IR and 29Si-NMR Studies on UV-Curable DDS-MPTMS/SiO2 Hybrid Coating |
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| Authors: | Jinna Lin Youjun Hou |
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| Affiliation: | 1. College of Materials Science and Engineering, South China University of Technology , Guangzhou, China;2. College of Traffic, Fujian Agriculture and Forestry University , Fuzhou, China;3. College of Materials Science and Engineering, South China University of Technology , Guangzhou, China |
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| Abstract: | Ultraviolet (UV)-curable DDS-MPTMS/SiO2 hybrid coating was prepared by sol-gel process from tetraethylorthosilicate (TEOS), dimethyl diethylorthosilicate (DDS), and methacrylate propyl trimethoxysilicate (MPTMS). The formation of inorganic–organic hybrid network was studied by FT-IR and 29Si-NMR during UV curing. It was found that the three-dimensional (3D) inorganic networks were formed mainly by condensation of TEOS, and the linear Si-O-Si bonds were also formed by condensation of DDS. The organic networks were formed by the polymerization of C[dbnd]C bonds in methacrylate units and the silanol groups were further condensed when the hybrid coating was cured by UV light. The steric hindrance of organic–inorganic hybrid networks resulted in incomplete polymerization and condensation. When the UV curing time was 240 s, the conversion degree of C[dbnd]C bonds was 81.0% and the condensation degree of silanol groups in TEOS and MPTMS was 81.8% and 91.5%, respectively. |
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| Keywords: | Dimethyl diethylorthosilicate (DDS) Hybrid network Methacrylate propyl trimethoxysilicate (MPTMS) Sol-gel process Tetraethylorthosilicate (TEOS) UV curing |
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