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Book title: Molecular and Ionic Recognition with Imprinted Polymers
Editors: Bartsch RA, Maeda M
Publisher: The American Chemical Society
City: Washington DC
Series title: ACS Symposium Series
Volume number: 703

Abstract: The origin of the imprinting effects which have been reported for metal ion-templated microspheres with acidic functionalities is probed by examining the acid dissociation properties of non-templated carboxylated resins prepared by emulsion polymerization. The equilibria are compared with those of polyacrylic acid, a linear polymer analog. It is found that: a) a strong and variable electric field is formed at the resin surface due to two-dimensional distribution of the carboxyl groups; b) the salt concentration effect on the acid dissociation equilibria for the resin is much smaller than that for polyacrylic acid, probably because of restricted mobility of the carboxylate groups at the water/polymer interface; and c) the intrinsic acid dissociation reaction at the interface proceeds by a two-step reaction in which hydrogen bonds are formed between two adjacent carboxyl groups. These findings indicate a carboxyl group arrangement which is favorable for the metal ion imprinting