Abstract
A copolymer of acrylonitrile (AN) and methyl acrylate (MA) was prepared by use of a redox catalyst and was separated into 16 fractions by successive solution fractionation, using dimethyl sulfoxide as the solvent and toluene as the precipitant. Except for the first few, all fractions had essentially the same composition: 92±0.5 weight percent in AN. Viscosity, light scattering and osmotic pressure were measured for these fractions in dimethylformamide (DMF), an ethylene carbonate (EC)/water mixture containing 82.5 wt% EC, and aqueous nitric acid of various compositions. This EC/water mixture at 25°C and 51 wt% aqueous nitric acid at 25°C were found to be Flory’s theta solvents for the AN/MA copolymer with 92 wt% AN. The Mark–Houwink–Sakurada equations for this polymer were [η]=2.13×10−2 Mw0.74 in DMF, [η]=0.152 Mw0.50 in the EC/water mixture, and [η]=0.215 Mw0.50 in 51 wt% aqueous nitric acid, all at 25°C. The molecular weight dependence of the radius of gyration ‹S2›z1/2 in DMF at 25°C was represented by ‹S2›z1/2/cm=2.13×10−9 Mw58. Flory’s viscosity parameter Φ was found to be 2.5×1023 in DMF at 25°C and 2.9×1023 in the EC/water mixture at 25°C. The unperturbed chain dimensions A determined by both thermodynamic and hydrodynamic methods were 0.93 in DMF, 0.86 in the EC/ water mixture, and 1.11 in 55 wt% aqueous nitric acid, all at 25°C, in units of 10−8 cm.
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Kamide, K., Miyazaki, Y. & Kobayashi, H. Dilute Solution Properties of Random Acrylonitrile/ Methyl Acrylate Copolymer. Polym J 14, 591–602 (1982). https://doi.org/10.1295/polymj.14.591
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DOI: https://doi.org/10.1295/polymj.14.591