Abstract
Abstract Coiling macromolecules, such as polystyrene, of narrow molecular weight distributions in a theta solvent exhibit the same critical properties in terms of critical exponents, such as β, γ, and v, as those of binary fluid systems. In addition, the same polymer coils in a fair (marginal) solvent reveal a pseudotransition behavior, absent in binary fluids of small molecules. This unique pseudo-transition occurs at a concentration which is roughly a few times lower than either the de Gennes' overlap concentration C* or the critical solution concentration. It disappears for polymer solutions either in a theta solvent where polymer coils are fairly contracted or in a good solvent where excluded volume effects play a dominant role. Static properties of polystyrene (M.W. = 13×106) in carbon tetrachloride (a fair solvent) at 14°, 18°, and 25°C near such a pseudo-transition are reported.
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