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Copolymerizations of ring-substituted methyl 2-cyano-3-phenyl-2-propenoates, RC,H,CH=C(CN)CO,CH, (R = CtH5, CH30, C1, Br, F) with styrene (M,) were studied in solution in the presence of a radical initiator. Terminal and penultimate kinetic models were applied for best prediction of the copolymer composition. The Alfrey-Price Q and e parameters calculated for the monomers correlate well with the relative reactivity ( l/rl). The relative reactivity showed a tendency to increase with increasing Hammett constant 6, cyclic voltammetric reduction potential, Ep, caIculated atomic charge, and I3C-NMR chemical shift on the olefinic a-carbon of the ring-substituted monomers. 627 Copyright 0 1997 by Marcel Dekker, Inc.