Abstract
A copolymer of acrylonitrile (AN) and vinylidene chloride (VDC) was prepared using azobisisobutylonitrile as an initiator and was separated into 20 fractions by successive solution fractionation, using dimethyl sulfoxide (DMSO) as the solvent and toluene as the precipitant. The fractions had essentially the same chemical composition: 59 weight percent in AN. Light scattering for a fraction in dimethylacetamide (DMAc), γ-butyrolactone (γ-BL) and dimethylformamide (DMF) gave the same weight-average molecular weight Mw within an experimental error ±2%, which was evaluated assuming homopolymer. Viscosity and light scattering were measured for 8 fractions in DMAc. The Mark–Houwink–Sakurada (MHS) equations for this polymer at 25 °C were in DMAc, in DMF, in γ-BL, and in 70 wt% aq nitric acid. The molecular weight dependence of the radius of gyration 〈S2〉z1/2 and the second virial coefficient A2 in DMAc at 25°C were represented by 〈S2〉z1/2=3.84×10−9 Mw0.53 and . The unperturbed chain dimension A was determined by Baumann, Stockmayer–Fixman and Kamide–Moore methods. The value of a copolymer of AN and VDC was by ca. 10% smaller than that of polyacrylonitrile.
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Kamide, K., Miyazaki, Y. & Yamazaki, H. Dilute Solution Properties of Acrylonitrile/Vinylidene Chloride Copolymer. Polym J 18, 645–652 (1986). https://doi.org/10.1295/polymj.18.645
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DOI: https://doi.org/10.1295/polymj.18.645