Please use this identifier to cite or link to this item: doi:10.22028/D291-24628
Title: Photochromic organic-inorganic hybrid nanocomposite hard coatings with tailored fast switching properties
Author(s): Mennig, Martin
Fries, Kira
Schmidt, Helmut K.
Language: English
Year of Publication: 1999
OPUS Source: Organic/inorganic hybrid materials II : symposium held April 5 - 9, 1999, San Francisco, California, U.S.A. / ed.: Lisa C. Klein ... - Warrendale, Pa. : Materials Research Society, 1999. — (Materials Research Society symposium proceedings ; 576), S. 409-414
SWD key words: Photochromie
Organisch-anorganischer Hybridwerkstoff
Vernetzung <Chemie>
DDC notations: 620 Engineering and machine engineering
Publikation type: Conference Paper
Abstract: A recently developed photochromic organic-inorganic nanocomposite (Nanomer) coating system is investigated, which is based on an epoxysilane as network former, different bisepoxides as spacer and an organic amine as thermal cross-linker. This coating system is compatible with different photochromic dyes like oxazines, pyrans and fulgides and also with surface modified ceramic nanoparticles as filler in order to obtain macroscopic hard properties' without changing the photochromic kinetics. In order to investigate the dye-spacer interactions and influence on the switching kinetic behavior, the matrix composition was diminished to the network former, the thermal cross-linker and two types (polar and nonpolar) of spacers in different concentrations. Four commercially available spirooxazines with different molecular sizes and polarities were incorporated into the matrices and coatings on glass slides were prepared by float-coating and cured at 130 °C for 2 h. The half darkening and half fading times of the coatings were measured by a fast diode array spectrometer as a function of spacer type and concentration for the four different dyes. The nonpolar' spacer CHMG did not influence the switching kinetic of the dyes significantly and fast switching times of 2 s-4 s were obtained. The polar' spacer PCF (aromatic character) showed interactions with the dye molecules, which led to an increase in the switching times of up to 25 s. The retardation of the switching process increased with increasing spacer content and with increasing polar character of the dye molecule. From these results, it could be concluded that the photochromic behavior of the spirooxazines could be adjusted to different applications by interactions with polar spacers.
Link to this record: urn:nbn:de:bsz:291-scidok-29367
ISBN: 1-558-99483-1
Date of registration: 23-Aug-2010
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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