Potentiometrie pH Response of Membranes Prepared with Various Aminated - Poly ( Vinyl Chloride ) Products *

The preparation and potentiometric pH response properties of membranes formulated with various aminated-poly(vinyl chloride) (PVC-NH2) products are described. Products containing secondary and/or primary amino functional groups are obtained by modifying PVC with monoand/or diamines, respectively. Blank membranes prepared with either type of aminated-polymer exhibit nearly Nernstian potentiometric pH responses over different pH ranges. In general, membranes based on diamino products exhibit pH response over a wider range (5-10.5) than membranes formulated with monoamino products (< 8.0). These potentiometric results are used to estimate the basicity of the various primary and secondary amino sites in the membrane phases.