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The Incorporation and Thermal Stability of Organic Dyes inDialkylsiloxane-Oxide Matrices

Published online by Cambridge University Press:  21 February 2011

John G. Darabi ,
W. R. Schmidt ,
G. Schwenke  and
R. K. MacCrone
John G. Darabi
Affiliation:
Materials Engineering Department, Center for Glass Science and Technology, Rensselaer Polytechnic Institute, Troy, NY 12180–3590. Current address: Battelle, Pacific Northwest Laboratories, Richland, WA 99352.
W. R. Schmidt
Affiliation:
Materials Engineering Department, Center for Glass Science and Technology, Rensselaer Polytechnic Institute, Troy, NY 12180–3590. Current address: United Technologies Research Center, East Hartford, CT 06108.
G. Schwenke
Affiliation:
Chemical Engineering Department, Rensselaer Polytechnic Institute, Troy, NY 12180–3590.
R. K. MacCrone
Affiliation:
Materials Engineering Department, Center for Glass Science and Technology, Rensselaer Polytechnic Institute, Troy, NY 12180–3590.
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Abstract

The dyes oxazine 725, 7-acetoxy-4-methyl coumarin,O-4-methylcoumarinyl-N-[3-(triethoxysilyl)-propyl] carbamate and2′,7′-dichlorofluorescein were introduced during the acid-catalyzedcohydrolysis of various molar ratios of tetraethoxysilane (TEOS) and the gelmodifers, diethoxydimethylsilane (DEDMS) or diethoxymethylvinylsilane(DEMVS). The morphological features and optical absorption spectra of theresulting dye doped gels were followed during subsequent drying and heating.For DEDMS-TEOS molar ratios less than 1.375, gel cracking during drying wasa problem. DEDMS-TEOS molar ratios greater than 2.750 yielded opticallytransparent monoliths, but did not allow for sufficient incorporation of dyeto be useful. However, the functionalized dye,0-4-methylcoumarinyl-N-[3-(triethoxysilyl)-propyl] carbamate, appeared to besignificantly more soluble in such a highly modified matrix. Compared tomatrices derived from pure TEOS the DEDMS or DEMVS modified matricesprovided oxazine 725 doped with improved thermal stabilities. Finally, the2′,7′-dichlorofluorescein doped dimethylsiloxane-oxide matrix showed goodthermal stability in its optical properties, having significant opticalabsorption and little change in the wavelength of the absorption maximumafter heating to 300°C.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 47
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

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