th  - 1987 - 51st ENC Conference

MF37
A Unique Method for the Quantitative Determination of Mixed Liquid
and Solid Phases Using Solid-State NMR Techniques
Evan H. Williams
Varian Associates, 611 Hansen Way, Palo Alto, California 94303
Many apparently solid materials axe, in fact, mixtures of both solid and liquid
phase components. It is not easy to investigate the morphology of such systems,
particularly in a non-invasivc way. NMR provides such a means for both solid and
liquid phases, but suffers from a lack of a readily acccssiblc, absolute quantitation.
An NMR technique has been developed that overcomes this problem, allowing
simultaneous observation of both phases in a manner that allows quantitation. Among
other possibilities, use of spectral editing allows the separation of the two phases into
separate subspectra. Such subspectra allow the observation of adsorption in the
presence of excess material in a quantitative way. Another use of the technique has
been found in the investigation of the kinetics of curing of network polymers 1.
A detailed description of the methodology and its application to a number of
representative systems will be presented.
1p.E.M. Allen, etal, Eur. Polym. J., 22. 549, (1986).