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.
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Hersh, L.S., Onyiriuka, E.C. & Hertl, W. Amine-reactive surface chemistry of zinc phosphate glasses. Journal of Materials Research 10, 2120–2127 (1995). https://doi.org/10.1557/JMR.1995.2120
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DOI: https://doi.org/10.1557/JMR.1995.2120