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Proceedings Paper

Novel nonhydrolytic sol-gel route to low-OH- and CH-containing organic-inorganic composites
Author(s): Martin Mennig; Michael Zahnhausen; Helmut K. Schmidt
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Paper Abstract

A new synthesis route to organic-inorganic composites with low OH- and CH-content has been developed. Thus methacrylate- modified chlorosilanes were either homocondensed or cocondensed with fluoroalkyl-modified chlorosilanes by a non- hydrolytic reaction with 2-methyl-2-propanol under formation of an inorganic network and hydrogen chloride and tertiary butyl chloride as well. Remaining chlorosilane groups were reacted by a second alcohol treatment to obtain air-stable, highly condensed, and low OH-containing sols. The condensation was followed by 29Si-NMR-spectroscopy, showing T2- content of up to 60% and T3 content of up to 35% for trichlorosilanes and D2-content of more than 90% for dichlorosilanes respectively. The OH-content, which was estimated by FT-IR-spectroscopy, was lower than 10% referring to materials prepared by the conventional aqueous sol-gel process. For further decrease of the CH-content copolymerization with fluorinated methacrylates was investigated. After addition of a photoinitiator transparent bulk materials with a diameter of 1 cm and a length of 1.5 cm were obtained by photopolymerization in closed UV-transparent containers using a Beltronr UV apparatus with a low pressure Hg-Xe lamp. NIR-absorbance measurements were carried out and optical losses of bulk materials were determined. Cocondensed and copolymerized materials show low optical losses of 0.12 dB/cm at 1300 nm and 0.33 dB/cm at 1550 nm.

Paper Details

Date Published: 6 July 1998
PDF: 11 pages
Proc. SPIE 3469, Organic-Inorganic Hybrid Materials for Photonics, (6 July 1998); doi: 10.1117/12.312906
Show Author Affiliations
Martin Mennig, Institut fuer Neue Materialien GmbH (Germany)
Michael Zahnhausen, Institut fuer Neue Materialien GmbH (Germany)
Helmut K. Schmidt, Institut fuer Neue Materialien GmbH (Germany)

Published in SPIE Proceedings Vol. 3469:
Organic-Inorganic Hybrid Materials for Photonics
Liliane G. Hubert-Pfalzgraf; S. Iraj Najafi, Editor(s)

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