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Proceedings Paper

Structural changes during thermally induced polymerization of ormosil films from trimethoxysilylpropylmethacrylate and zirconium-n-propoxide modified with methacrylic acid
Author(s): Kiyoharu Tadanaga; Bryan Ellis; Angela B. Seddon
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Paper Abstract

Structural changes during thermally induced polymerization of the dipped thin films prepared from TMSPM, zirconium n- tetrapropoxide and methacrylate acid were investigated using near- and mid-IR spectroscopy. In the mid-IR spectra, the intensity of the band due to C equals C was decreased by the heat-treatment at 160 degrees C. The intensity of the band due to C equals O in the polymerized methacrylate, was increased. In the near-IR spectra, the intensities of a band due to the first overtone of fundamental (nu) as(CH2equals) and a combination changes show that heat-treatment of the films at 160 degrees C leads to depletion of C equals C bonds, indicating that polymerization has occurred of TMSPM and methacrylic acid. However, in the mid-IR spectra, the intensity of the band at around 3500 cm-1, due to O- H bonds, increased with the progress of polymerization of vinyl groups. Near-IR spectra of the dipped thin films showed that this increase in intensity of the O-H band is due to the increase of monomeric water molecules hydrogen bonded to silanols. This indicates that polymerized samples are more hydrophilic than unpolymerized ones. The refractive index of the dipped films, measured with a prism coupling method, increased from 1.508 to 1.516 with the polymerization for composition Zr/(Zr + Si) of 0.2.

Paper Details

Date Published: 2 May 2000
PDF: 8 pages
Proc. SPIE 3943, Sol-Gel Optics V, (2 May 2000); doi: 10.1117/12.384341
Show Author Affiliations
Kiyoharu Tadanaga, Univ. of Sheffield (Japan)
Bryan Ellis, Univ. of Sheffield (United Kingdom)
Angela B. Seddon, Univ. of Sheffield (United Kingdom)

Published in SPIE Proceedings Vol. 3943:
Sol-Gel Optics V
Bruce S. Dunn; Edward J. A. Pope; Helmut K. Schmidt; Masayuki Yamane, Editor(s)

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