AbstractThe possibility of utilizing cloud point titrations for obtaining theta‐cosolvent compositions for PVC solutions was examined for a range of THF—nonsolvent systems. Hansen's1–3“radii of solubility spheres” were calculated for the various solvents and cosolvent solutions and compared with the observed solubility behavior. The application of theta‐cosolvent solutions for simplifying the determination of the number‐average molecular weight was
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