Abstract
AbstractThe aqueous pseudoheterogeneous polymerization of methyl methacrylate in the absence and presence of some metal chlorides or sulfates was carried out in nitrogen atmosphere at 40°C using sodium bisulfite as initiator. The metal chlorides or sulfates were found to catalyze the rate of polymerization of methyl methacrylate to different extents. The highest effect was obtained in the presence of copper salts, a moderate effect was obtained when iron salts were used, and the least effect was caused by the others. All 13C‐NMR spectra for the polymers obtained in the absence and presence of some metal salts were those to be expected for radically initiated poly(methyl methacrylate)s of conventional, slightly syndiotactic‐rich microstructures prepared at normal temperature. The spectra were found to be very similar to that for a radical poly(methyl methacrylate) first analyzed by Inoue et al. The ratios of isotactic (mm): heterotactic (mr,rm): syndiotactic (rr) triads were found to be close to 6 : 32 : 62. The polydispersity for some poly(methyl methacrylate)s determined by gel permeation chromatography technique was found here to vary rather widely and ranges between 1.8 and 8.92.
Published Version
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