Stiff-Chain Nature of Poly(1-phenyl-1-propyne) in Dilute Solution

Abstract

Light scattering and viscosity measurements were made on twelve narrow-molecular weight distribution samples of poly(1-phenyl-1-propyne) in toluene and in cyclohexane. In cyclohexane at 36°C, the second virial coefficient A2 vanished, the mean-square radius of gyration increased linearly with weight-average molecular weight Mw, but the intrinsic viscosity was not proportional to Mw1/2. Thus poly(1-phenyl-1-propyne) in cyclohexane at 36°C is an unperturbed semiflexible polymer. A2 in toluene was positive, indicating significant intermolecular excluded volume effect. However the intramolecular excluded volume effect became appreciable only at Mw higher than 3×105. Analysis of the light scattering and viscosity data in terms of the wormlike chain model gave persistence lengths of 3.8 and 3.9 nm in cyclohexane and toluene, respectively. The Flory viscosity factor in the unperturbed-coil limit was 2.17×1023 and 2.35×1023 mol−1 in the two solvents.

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Hirao, T., Teramoto, A., Sato, T. et al. Stiff-Chain Nature of Poly(1-phenyl-1-propyne) in Dilute Solution. Polym J 23, 925–932 (1991). https://doi.org/10.1295/polymj.23.925

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Keywords

  • Semiflexible Polymer
  • Wormlike Chain
  • Persistence Length
  • Stiffness
  • Flory Viscosity Factor
  • Excluded Volume Effect
  • Poly(1-phenyl-1-propyne)
  • Substituted Polyacetylene

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