Novel nonhydrolytic sol-gel route to low-OH- and CH-containing organic-inorganic composites

Martin Mennig; Michael Zahnhausen; Helmut K. Schmidt

doi:10.1117/12.312906

6 July 1998 Novel nonhydrolytic sol-gel route to low-OH- and CH-containing organic-inorganic composites

Martin Mennig, Michael Zahnhausen, Helmut K. Schmidt

Proceedings Volume 3469, Organic-Inorganic Hybrid Materials for Photonics; (1998) https://doi.org/10.1117/12.312906
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

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 Beltron^r 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.

Citation Download Citation

Martin Mennig, Michael Zahnhausen, and Helmut K. Schmidt "Novel nonhydrolytic sol-gel route to low-OH- and CH-containing organic-inorganic composites", Proc. SPIE 3469, Organic-Inorganic Hybrid Materials for Photonics, (6 July 1998); https://doi.org/10.1117/12.312906

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