Abstract
The intrinsic viscosities [η] of fractions of the statistical copolymer of acrylonitrile with vinyl acetate in DMFA and the binary solvent DMFA-THF (1 : 1 by volume) have been measured. The method of approximation to sedimentation equilibrium in DMFA has been used to determine the weight average molecular masses M w and the second viraal coefficients A 2 and in DMFA-THF the sedimentation constants S 0. From the values of [η], A 2 and M w the authors calculate the unperturbed dimensions for fractions of different composition; on average, the length of the Kuhn segment is ∼ 25 A ̊ . Some anomalies of the hydrodynamic behaviour of solutions of acrylonitrile-vinyl acetate copolymers are explicable only by taking into account the microstructure of the chains—the stereoregularity of the acrylonitrile blocks and the distribution by the lengths of the sequences of the vinyl acetate units determined by the method of IR spectroscopy.
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