Abstract
Dilute through semidilute solutions of a semiflexible polymer, poly(n-hexyl isocyanate) (PHIC), dissolved in a good solvent, dichloromethane (DCM), were studied by static light scattering as well as by sedimentation equilibrium. The solutions showed the following characteristic features, which were distinct from those of flexible polymer-good solvent systems. (1) The second virial coefficient was independent of the molecular weight. (2) The reduced third virial coefficient was much smaller than that for a flexible polymer in a good solvent. (3) The concentration dependences of the osmotic compressibility (∂c/∂II) and correlation length ξ did not obey the scaling law nor the prediction of the renormalization group theory that was successful for flexible polymer-good solvent systems
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