Abstract
The concentration dependence of screening lengths in polystyrene solutions is determined by light and neutron scattering measurements. The data support the existence of a marginal regime in the temperature-concentration diagram, inside which mean field behaviour is observed. In addition, it is found that polymer solutions conforming to either semidilute good or marginal behaviour can be described universally in terms of two common variables: a reduced correlation length, and a reduced concentration. Experimentally determined concentrations for crossovers between various regimes of solution behaviour are reported, and compared with quantitative predictions from a recent theory of Schaefer.
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