Abstract
The effects of polymer concentration on chain dimensions in good solvents is discussed in order to define the boundary between the semi-dilute and concentrated regimes. Based upon the screening principle of Edwards and de Gennes, it appears that chain dimensions should approach their unperturbed values for many systems at polymer volume fractions in the range of 0.05–0.20, independent of molecular weight. From these results we propose a method for correlating viscoelastic properties in the semi-dilute region which takes into account the contraction of dimensions with concentration. We also suggest the use of a concentration-molecular weight diagram to distinguish the several regions of viscoelastic behaviour.
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