N1C=[CH:5][CH:4]=[CH:3][C:2]=1[C:7]1[CH:12]=[CH:11][CH:10]=CN=1.[CH2:13]([O:15][C:16](=[O:21])[C:17](Br)(C)[CH3:18])C.C(OC)(=O)C=C.C(OC)(=O)C(C)=C>C=CC1C=CC=CC=1>[C:16]([O:15][CH3:13])(=[O:21])[CH:17]=[CH2:18].[CH2:5]=[CH:4][C:3]1[CH:2]=[CH:7][CH:12]=[CH:11][CH:10]=1In a third experiment, 0.063 g of CuBr, 0.205 g of 2,2′-bipyridyl and 0.64 ml of ethyl-2-bromoisobutyrate was added to 10 ml of styrene and the reaction mixture was heated to 95° C. Methyl acrylate was added to the reaction mixture at a rate of addition of 0.05 ml/min such that the final reaction mixture contained 90% of methyl methacrylate. Samples were withdrawn at certain time periods. From the composition data obtained from NMR measurements of these samples and from GPC measurement of the molecular weights relative to polystyrene standards, the compositional gradient along the chain of the final copolymer was calculated (FIGS. 9A-B). The final polymer (3.08 g) was purified by reprecipitation from methanol/THF. DSC measurements of the final copolymer show a single glass transition with Tg=58° C.
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