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Polyphosphate Chain Stability in Magnesia-Polyphosphate Cements

Published online by Cambridge University Press:  15 February 2011

E. D. Dimotakis,
W. G. Klemperer and
J. F. Young
E. D. Dimotakis
Affiliation:
Departments of Chemistry, Civil Engineering and Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801.
W. G. Klemperer
Affiliation:
Departments of Chemistry, Civil Engineering and Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801.
J. F. Young
Affiliation:
Departments of Chemistry, Civil Engineering and Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801.
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Abstract

Polyphosphates of the general formula NanH2PnO3n+1·H2O, n = 6, 15, 70, where n is the average degree of polymerization, have been synthesized and characterized by 31P NMR and HPLC. Aqueous solutions of these polyphosphates react at room temperature with magnesia to form cement pastes that harden to amorphous materials. The compressive strengths and porosities obtained are similar to those of MgO-(NH4)H2P3O10-H2O cements. Although polyphosphate chain length does not have a significant effect on the strength of the cement, 31P MAS-NMR spectroscopy showed that the degree of polyphosphate chain degradation decreases as the average degree of polymerization, n, increases.

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References

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