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Effect of some anions of some nickel salts on the aqueous polymerization of methyl methacrylate
Author(s) -
Moustafa A. B.,
Badran A. S.,
AbdElHakim A. A.
Publication year - 1985
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1985.070300514
Subject(s) - polymerization , nickel , aqueous solution , methyl methacrylate , chemistry , tacticity , polymer chemistry , sodium bisulfite , polymer , catalysis , inorganic chemistry , organic chemistry
The 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 −2 4 ) 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 × 10 4 J/mol in the absence and in the presence of Ni(NO 3 ) 2 , NiCl 2 , and NiSO 4 containing the same amount of nickel (0.00587 g). 13 C‐NMR spectra for the polymers obtained in the absence and in the presence of different nickel anions were found to result in nearly the same tacticity.