Effect of some anions of some nickel salts on the aqueous polymerization of methyl methacrylate

摘要

AbstractThe aqueous polymerization of methyl methacrylate in the absence and in the presence of some anions of nickel salts was carried out at temperatures of 40°C, 50°C, and 60°C using sodium bisulfite as initiator. The nitrate anion (NO −3) was found to have the highest catalytic effect and resulted in polymers having the least average molecular weights, while the sulfate anion (SO −24) was found to have the least catalytic effect and resulted in polymers having the highest average molecular weights. The apparent activation energy for the polymerization process was found to be 4.3, 3.6, 3.8, and 4.8 × 104J/mol in the absence and in the presence of Ni(NO3)2, NiCl2, and NiSO4containing the same amount of nickel (0.00587 g).13C‐NMR spectra for the polymers obtained in the absence and in the presence of different nickel anions were found to result in nearly the s