Abstract
Small angle X-ray scattering and light scattering from linear and branched polymers in a good solvent were measured to study the concentration dependence of correlation length ξ over a wide range of concentration and the effects of branching on ξ. The concentration dependence of ξ of linear polymers in semidilute solutions is well explained by the scaling theory and the reduced correlation length ξ/‹s2›1/2 of linear polymers is found to be an universal function of the degree of coil-overlapping C/C* over wide ranges of molecular weight and concentration in semidilute solutions as predicted by the scaling theory. The effects of branching are found to be not so remarkable that ξ of branched polymers is almost equal to that of linear polymers in the same concentration.
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