Organically modified silicates (ormosils) of two systems were coated on polyethyleneterephthalate (PET) substrates. One was the tetraethoxysilane (TEOS)-vinyltriethoxysilane (VTES) system and the other was the TEOS-tetraisopropyltitanate (TIPT)-VTES system. The reactions among the alkoxides were examined by liquid state 29Si nuclear magnetic resonance (NMR) spectroscopy. The chemical bonds between TEOS and VTES, between TEOS and TIPT, and between VTES and TIPT are shown in the spectra and the reaction schemes are proposed. Vickers hardnesses of the ormosil coatings were obtained by using the models developed by Jönsson and Hogmark, and the theoretical models developed by the authors were valuable to predict the hardness values. The ormosil coatings obtained in the present study were much harder than the hardest transparent plastics, and thus are very useful for hard or protective coatings on organic polymers.
KeywordsSilicate Nuclear Magnetic Resonance Liquid State High Hardness Alkoxide
Unable to display preview. Download preview PDF.
- 2.G. L. Wilkes, B. Orler and H. Huang, Polym. Prepr. 26 (1985) 300.Google Scholar
- 3.J. J. Bikerman (Ed.), in “The Science of Adhesive Joints” (Academic Press, New York, 1968).Google Scholar
- 5.T. Iwamoto and J. D. Mackenzie, in “Better Ceramics Through Chemistry VI”, edited by A. K. Cheetham, C. J. Brinker, M. L. Mecartney and C. Sanchez (Elsevier, New York, 1994) p. 397.Google Scholar
- 6.Idem, J. Sol-Gel Sci. Technol. 4 (1995)Google Scholar
- 8.G. C. Levy and J. D. Cargioli, in “Nuclear Magnetic Resonance Spectroscopy of Nuclei Other Than Protons”, edited by T. Axenrod and G. A. Webb (Wiley, New York, 1974) Ch. 17.Google Scholar
- 9.Y. Sugahara, Y. Tanaka, S. Saito, K. Kuroda and C. Kato, in “Better Ceramics Through Chemistry V”, edited by M. J. Hampden-Smith, W. G. Klemperer and C. J. Brinker (Elsevier, New York, 1992) p. 231.Google Scholar
- 11.H. Marsmann, in “NMR-17, Oxygen-17 and Silicon-29”, edited by P. Diehl, E. Fluck and R. Kosfeld (Springer, Berlin, 1981) p. 65.Google Scholar
- 12.A. K. Bhattacharya and W. D. Nix, Int. J. Solids Struct. 24 (1988) 1287.Google Scholar
- 14.K. H. Sun, J. Amer. Ceram. Soc. 30 (1947) 277.Google Scholar
- 16.C. J. Brinker and G. W. Scherer (Eds), in “Sol-Gel Science” (Academic Press, San Diego, 1990) p. 799.Google Scholar
- 18.M. Imaoka, H. Hasegawa, Y. Hamaguchi and Y. Kurotaki, Yogyo Kyokaishi 79 (1971) 164.Google Scholar
- 19.L. Ainworth, J. Soc. Glass Technol. 38 (1954) 501.Google Scholar