Abstract
Monomer reactivity ratios r1 and r2 can be determined from a single sample of a copolymer if the mole fraction of each dyad is given. Similar treatment is possible for ratios r11, r12, r21, and r22 if the mole fraction of each triad is given. According to this method of determination of monomer reactivity ratios r12 and r22 were obtained for acrylonitrile (M1)–methyl methacrylate (M2) system based on the values of mole fraction of three kinds of triad, namely, 121, 122 (and 221), and 222, which were evaluated from the relative intensities among corresponding three OCH3 peaks in its NMR spectrum. These ratios were insensitive to the feed ratios of monomers, slightly affected by the species of penultimate units, and considerably affected by the homogeneity of the system. These monomer reactivity ratios decreased with polymerization temperature. These conclusions could not be obtained if the monomer reactivity ratios were not determined from a single sample, because the estimated errors were comparable order of magnitude with the difference among experimental values in traditional methods.
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Chûjô, R., Ubara, H. & Nishioka, A. Determination of Monomer Reactivity Ratios in Copolymerization from a Single Sample and Its Application to the Acrylonitrile–Methyl Methacrylate System. Polym J 3, 670–674 (1972). https://doi.org/10.1295/polymj.3.670
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DOI: https://doi.org/10.1295/polymj.3.670
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