Abstract
Molecular weight determinations by light scattering and osmometry and also measurements of intrinsic viscosity were made in toluene for fractions of styrene- p-methoxystyrene “random” copolymers with different compositions. Relationships between intrinsic viscosity and molecular weight thus established are compared with those of the parent homopolymers. The values of the Flory constant ( K θ ) and the polymer-solvent interaction parameter ( B) have been evaluated applying the theories of Kurata-Stockmayer-Roig, Stockmayer-Fixman and Berry. On the basis of the experimental data, it was found that the unperturbed dimensions for copolymers are larger than those for homopolymers and that the copolymer of about equimolecular composition shows peculiar behaviour in comparison with copolymers of other compositions.
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