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Amine-reactive surface chemistry of zinc phosphate glasses

Published online by Cambridge University Press:  03 March 2011

L.S. Hersh ,
E.C. Onyiriuka  and
W. Hertl
L.S. Hersh
Affiliation:
Research and Development Division, Corning, Inc., Sullivan Park, Corning, New York 14831
E.C. Onyiriuka
Affiliation:
Research and Development Division, Corning, Inc., Sullivan Park, Corning, New York 14831
W. Hertl
Affiliation:
Research and Development Division, Corning, Inc., Sullivan Park, Corning, New York 14831
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Abstract

Surface chemical studies on zinc phosphate glasses were carried out with an ammonia probe using FTIR and XPS. Low softening point zinc phosphate glasses can be co-extruded with high softening point polymers to form polymer filled blends. NH3 reacts with P-OH groups (Br⊘nsted acid sites) to form bound NH4+ and with the zinc ions (Lewis acid sites) to form coordinately bound NH3. Bulk nitridation reactions, forming various P-N bonds to >100 nm, occur concurrently. The glass surfaces were depleted in Zn compared to the batch compositions. Exposure to ambient water vapor removed Lewis acid bound ammonia; aqueous washing removed both types. Di- and tri-methyl amines also reacted with surface Br⊘nsted and Lewis acid sites. These amine reactions have the potential for binding polymer chains to the glass surface.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 8 , August 1995 , pp. 2120 - 2127
Copyright
Copyright © Materials Research Society 1995

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