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Excluded volume and hydrodynamic properties of polystyrene in non-ideal solvents

Abstract

At 298 K, intrinsic viscosity [η], has been measured for fifteen polystyrene, PS, samples of different relative molar masses M in pure toluene T, and seven different binary solvents. These solvents were toluene / methanol (MeOH) mixtures having different volume fractions of MeOH. The θ-composition for the binary solvent system was found to be 77% T / 23% MeOH at 298 K. The dependance of excluded volume of polymer molecules on M and the solvation power was demonstrated. A constant value of 0.633 nm for the effective unit length, b, was obtained under θ-condition. Meanwhile a non-constancy of b, obtained in case of thermodynamically good solvents, was attributed to the neglect of excluded volume effect.

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Abdel-Azim, A.A. Excluded volume and hydrodynamic properties of polystyrene in non-ideal solvents. Polymer Bulletin 30, 579–586 (1993). https://doi.org/10.1007/BF00296478

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Key words

  • polystyrene
  • hydrodynamic
  • excluded volume
  • binary solvents
  • viscosity
  • θ-condition