AbstractOsmotic‐pressure, viscosity, and light‐scattering measurements have been carried out on dilute solutions of poly‐N‐vinylcarbazole fractions (4<10‐4M<230) in toluene, dioxane, and benzene. The theta temperature for poly‐N‐vinylcarbazole in toluene solutions has been found to be 37 ± 1°C. The intrinsic viscosity of poly‐N‐vinylcarbazole in toluene at 37°C is represented by [η]θ = 76.2 × 10−3M̄n0.50. Values of the characteristic ratios (〈L2〉0/M)1/2and σ = (〈L2〉0/〈L2〉0f)1/2have been obtained as 633 × 10−11and 2.85, respectively. It appears that the large σ value is due to the