Abstract
Temperature coefficients of unperturbed dimensions of three high molecular weight polystyrene stars have been evaluated from intrinsic viscosity measurements in six theta solvents and two solvent/nonsolvent mixtures over a temperature range of 10 to 70°C. Larger values of unperturbed dimensions were found in cyclic aliphatic solvents than in chloroalkanes at similar temperatures. Negative values of the temperature coefficient of unperturbed dimensions were found in both solvent series, values which were in essential agreement with those found for linear polystyrene. The values of the branching index, g′, were found to be independent of both temperature and solvent type.
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