Abstract
The unperturbed dimensions of atactic polybutene-1 have been determined by viscosimetric measurements in θ solvents over the range −46° to +83°. Additional data on unperturbed dimensions, calculated by the Kurata-Stockmayer approximation from studies of solutions in good solvents, are suitable to extend the range of temperature to 100°. From all calculated and measured quantities, the following temperature coefficient is found: d 1 n r 2 0 dT ·10 3=−1·2±0·2 This value is compared with that obtained by thermoelastic measurements, which give a positive value for the coefficient: the possible causes for this fact are discussed.
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