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Small-angle X-ray scattering studies of semidilute polystyrene-cyclohexane solutions

Author

Listed:
  • Xie, Yonglin
  • Ludwig, Karl F.
  • Bansil, Rama
  • Gallagher, Patrick D.
  • Cao, Xingxiang
  • Morales, Guarionex

Abstract

Small-angle X-ray scattering was used to study semidilute polystyrene-cyclohexane solutions at temperatures from below the coexistence curve to above the Θ point. Deviations from Θ point concentration scaling were observed as the coexistence line was approached. A new scaling form is suggested which combines the concentration scaling near the Θ point with the temperature scaling near a spinodal; it collapses the experimental data. This approach assumes that the “bare” correlation length ge0 scales as c−1. The observed low-angle “excess scattering” is best described by the Debye-Bueche random heterogeneity model, rather than the attractive potential model of Medjahdi and co-workers. The “excess scattering” is virtually independent of temperature, suggesting that the inhomogeneities which cause it are not affected by the approaching phase transformation.

Suggested Citation

  • Xie, Yonglin & Ludwig, Karl F. & Bansil, Rama & Gallagher, Patrick D. & Cao, Xingxiang & Morales, Guarionex, 1996. "Small-angle X-ray scattering studies of semidilute polystyrene-cyclohexane solutions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 232(1), pages 94-108.
    • Handle: RePEc:eee:phsmap:v:232:y:1996:i:1:p:94-108
    DOI: 10.1016/0378-4371(96)00218-X
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    1. Brentjes Burchard, 1984. "Klimawechsel und Siedlungegeschichte im eurasiatischen Steppenraum und am Aralsee," Jahrbuch für Wirtschaftsgeschichte / Economic History Yearbook, De Gruyter, vol. 25(1), pages 195-204, January.
    2. Kaneko, Mamoru, 1975. "Necessary and sufficient conditions for transitivity in voting theory," Journal of Economic Theory, Elsevier, vol. 11(3), pages 385-393, December.
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