Abstract
At 371.5 K, which is the θ-temperature for polystyrene (PS) in 3-methyl cyclohexanol (MC), intrinsic viscosities [η] have been measured for PS samples of different relative molar mass M in mixtures of MC with a thermodynamically good solvent 1,2,3,4-tetrahydronaphthalene over the whole range of solvent composition. Eleven graphical procedures have been utilised and assessed in deriving the unperturbed polymer dimensions expressed as K θ (in the relation [η] = K θM 1 2 α 3 where α is the expansion factor). For those procedures concluded to be the most reliable, there was no influence of binary solvent composition: the value of K θ = 78 (±1) × 10 −3 dm 3 kg −1 was the same as that obtained directly under θ-conditions.
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