Add time:08/06/2019         Source:sciencedirect.com

The copolymerization of 2-naphthyl methacrylate (2-NM) with methyl methacrylate (MMA) initiated by 2,2′-azoisobutyronitrile in carbon tetrachloride, chloroform, benzene, acetone and acetonitrile was investigated. The reactivity ratios determined by the methods of Fineman-Ross and Kelen-Tüdős are: in carbon tetrachloride—r2-NM = 2.46 ± 0.25, rMMA = 0.61 ± 0.06; chloroform—r2-NM = 2.71 ± 0.30, rMMA = 0.60 ± 0.06; benzene—r2-NM = 2.62 ± 0.44, rMMA = 0.63 ± 0.11; acetone—r2-NM = 4.13 ± 0.45, rMMA = 0.60 ± 0.06 and acetonitrile—r2-NM = 3.70 ± 0.30, rMMA = 0.62 ± 0.05.The dependence of the reactivity ratios on the solvent is explained on the basis of formation of complexes between the electron-donating naphthalene rings and the electron-accepting methacrylic double bonds, as indicated by NMR studies.

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