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Abstract
An acrylonitrile-dimethylaminoethyl methacrylate copolymer has been synthesised by a straightforward procedure. The cationic nature of the copolymer permits ready attachment of heparin and reaction of the copolymer with ethylene oxide gas allows a controlled alteration in chemical structure. These features of the copolymer are discussed with respect to the influence of polymer properties on blood compatibility as exemplified by blood platelet retention.