Abstract
An ion-exchange packing for use in gas—solid chromatography was prepared with a high temperature stable polymer and characterized in Cu 2+ form using several aromatic amines. Silica glass beads were coated at 2.2% (w/w) with poly-2,6-diphenyl- p-phenylene oxide which was then sulfonated and exchanged using Cu 2+. Capacity of the material was determined through titration as 0.16 mequiv./g of packing or 7.4 mequiv./g of polymer. Selectivity of amines versus aromatic hydrocarbon analogs was exhibited by the packing in Cu 2+ form and t′ R increased for aromatic amines: primary > secondary > tertiary. These results are consistent with steric hindrance in group specific interactions such as complexation. Changes in k′ for aniline and N,N.-dimethylaniline were less than 5–6% for the Cu 2+ form during a 48h period with column temperature of 250°C. No shrinkage of the column packing was observed under these conditions. Properties of thermal stability and specificity exhibited by this material are satisfactory for further characterization as a selective absorbent for amines in atmospheric samples.
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