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- W2051263456 abstract "The information concerning D-units in methyl methacrylate polymer chains has inproved our knowledge about the stereoregularity of the polymer. As an extension of the study, we have examined styrene-methylmethacrylate copolymers prepared under various polymerization conditions. In these cases, the α-methyl resonance of methyl methacrylate does not change, except that the peak position shifts towards a higher magnetic field as the styrene component of the polymer chain increases. A direct evidence of the copolymer structure has been obtained by the analysis of the methoxy resonance. A total of six methoxy resonance lines can be observed if any methyl methacrylate monomer unit in the copolymer chain can be classified only in terms of its placement relative to the neighboring styrene monomer units.Monomer reactivity ratios have been estimated from the NMR spectra. The results are r1 (styrene)=0.56±0.01 and r2 (MMA) = 0.50±0.03." @default.
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- W2051263456 date "1964-11-01" @default.
- W2051263456 modified "2023-09-25" @default.
- W2051263456 title "A High Resolution Nuclear Magnetic Resonance Study of the Styrene-Methylmethacrylate Copolymer" @default.
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- W2051263456 doi "https://doi.org/10.1246/bcsj.37.1630" @default.
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