Some light‐scattering evidence of critical concentration in dilute polymer solution

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Abstract
Evidence of a critical concentration effect in dilute polymer solution has been obtained from light‐scattering measurements in two ternary systems of the type polymer A–polymer B–solvent S. The root‐mean‐square end‐to‐end distance, (r2)1/2, of A was measured in a series of mixed solvents (B–S), differing from one another only in respect Of CB, the concentration of polymer B. The (r2)1/2 vs. CB curve exhibited a slight dip in the system polystyrene–polyvinyl acetate–benzene and a slight peak in the system polystyrene–polyvinyl acetate–butanone, at values of CB close to but not identical with the critical concentrations determined viscometrically for the same systems. The size, nature, and location of these light‐scattering critical concentration effects are briefly discussed in the light of similar but better established viscosity effects.

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