Please use this identifier to cite or link to this item:
|Title:||A novel non-hydrolytic sol-gel route to low OH- and CH-containing organic-inorganic composites|
Schmidt, Helmut K.
|Year of Publication:||1998|
|OPUS Source:||Organic-inorganic hybrid materials for photonics : 19-20 July 1998, San Diego, California / Liliane G. Hubert-Pfalzgraf ... chairs, eds. - Bellingham, Wash. : SPIE, 1998. - (SPIE proceedings series ; 3469), S. 68-78|
|SWD key words:||Sol-Gel-Verfahren|
|DDC notations:||620 Engineering and machine engineering|
|Publikation type:||Conference Paper|
|Abstract:||A new synthesis route to organic inroganic composites with low OH- and CH-content has been developed. Thus methacrylate-modified chlorosilanes were either homocondensed or cocondensed with fluoroalkyl-modifed 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 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 conventionel 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 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.|
|Link to this record:||urn:nbn:de:bsz:291-scidok-28924|
|Date of registration:||16-Jun-2010|
|Faculty:||SE - Sonstige Einrichtungen|
|Department:||SE - INM Leibniz-Institut für Neue Materialien|
SciDok - Der Wissenschaftsserver der Universität des Saarlandes
Items in SciDok are protected by copyright, with all rights reserved, unless otherwise indicated.