Donor-Acceptor Complexes in Copolymerization. XVII. NMR Analyses of Random and Alternating Styrene–α-Chloroacrylonitrile Copolymers

The NMR spectra of random and equimolar alternating copolymers of styrene with a-chloroacrylonitrile were studied. The monomer sequence distribution in the random copolymers, prepared in the presence of free radical catalysts, as determined from NMR analyses, was in accordance with the values expected from the r1 and r2 values derived from the conventional copolymerization theory. The alternating structure of the copolymer prepared by complexation with AlEt1-5 Cl1-5 was confirmed. The equimolar random copolymer, prepared by free radical initiation, was shown to contain essentially alternating sequences.