Values of the unperturbed dimensions of poly(2-hydroxyethyl methacrylate) have been determined in five non-ideal solvents using viscometric data and a number of different theoretical treatments. Values of the steric factor 0, the characteristic ratio C, and the expansion factor r were also calculated. There was some variation of all these parameters with solvent but on the whole they were comparable to values for polymethacrylates with non-polar side groups of a similar size.
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