Preparation and properties of flexible free‐standing films via polyalkoxysiloxanes by acid‐catalyzed controlled hydrolytic polycondensation of tetraethoxysilane and tetramethoxysilane |
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| Authors: | Takahiro Gunji Yuki Hayashi Akemi Komatsubara Koji Arimitsu Yoshimoto Abe |
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| Institution: | 1. Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, , Chiba, 278‐8510 Japan;2. Department of Food Science, Faculty of Health and Nutrition, Tokyo Seiei College, , Tokyo, 124‐8530 Japan |
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| Abstract: | Acid‐catalyzed controlled hydrolytic polycondensation of tetraethoxysilane (TEOS) and tetramethoxysilane (TMOS) provided polyalkoxysiloxanes PEOS and PMOS, with high molecular weight of 1100–12 000 or 2700–31 000, respectively. They were stable to self‐condensation, soluble in organic solvents, and especially characterized by high silica content of up to 62% (PEOS) and 72% (PMOS). Flexible and transparent free‐standing films with tensile strength of 1.6–5.2 MPa (PEOS) or 3.6–11.8 MPa (PMOS) were prepared by heating polyalkoxysilanes at 80°C for one to several days. They are also regarded to be a potential precursor for coatings and binders. Copyright © 2012 John Wiley & Sons, Ltd. |
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| Keywords: | tetraethoxysilane tetramethoxysilane hydrolysis free‐standing film coating film |
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