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Excluded-volume effects on the intrinsic viscosity of oligomers and polymers of styrene and isobutylene

The intrinsic viscosity [η] was determined for atactic polystyrene (a-PS) in toluene at 15.0°C in the range of molecular weight M w from 2.66×10 2 to 3.84×10 6 and for polyisobutylene (PIB) in n-heptane at 25.0°C in the range of M w from 1.12×10 2 to 1.76×10 6 . These solvents and temperatures have been chosen so that the values of [η] for the unperturbed a-PS and PIB chains in given good solvents may coincide with the respective values of [η],, in cyclohexane at 34.5°C (θ) and in isoamyl isovalerate at 25.0°C (θ). It is then found that the viscosity-radius expansion factor thus determined correctly is a function only of the radius expansion factor in a first approximation, in contrast to literature data