Determination of Paraformaldehyde Reactivity and Its Relationship to PRF Resin Gelation

Authors

  • Paul R. Steiner

Keywords:

Paraformaldehyde, PRF, titration, gelation reactivity

Abstract

A titration procedure is described for determining paraformaldehyde reactivity in aqueous solution using common chemical reagents of Na2SO3 and NaH2PO4. This reactivity is a measure of the monomeric formaldehyde released by the depolymerization of paraformaldehyde. Under certain experimental conditions, a curvelinear relationship was established between paraformaldehyde titration values and gelation times in a PFR resin. By utilizing a stepwise version of this titration method, the total reactivity distribution within paraformaldehyde samples could be determined and compared.

References

Chow, S. 1977. A curing study of phenol-resorcinol-formaldehyde resins using infrared and thermal analysis. Holzforschung 31(6):200-205.nWalker, J. F. 1964a. Paraformaldehyde. Pages 145-158 in Formaldehyde. ACS Monogram Series 159. American Chemical Society, Washington, D.C.nWalker, J. F. 1964b. Quantitative analysis. Pages 486-488 in Formaldehyde. ACS monogram series 159. American Chemical Society, Washington, D.C.n

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Published

2007-06-28

Issue

Number 1 / January 1992

Section

Research Contributions

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