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Nine samples of a polymacromonomer consisting of polystyrene with a fixed side-chain length of 33 styrene residues and ranging in total weight-average molecular weight Mw from 1.9×105 to 1.1×107 have been prepared and studied by light scattering in cyclohexane at temperatures between 25 and 45°C. The second virial coefficient is found to vanish at 34.5 (±2)°C, the Θ temperature for linear polystyrene in cyclohexane. The Mw dependence of z-average mean-square radius of gyration S2z at this temperature is analyzed on the basis of the wormlike chain to obtain 22 nm for Kuhn’s statistical segment length λ−1 and 13000 nm−1 for the molar mass per unit contour length. The chain stiffness as indicated by this λ−1 value is one order of magnitude higher than that of linear polystyrene. Analysis of S2z at temperatures other than the Θ point is also made with the aid of the quasi-two-parameter theory for excluded-volume effects. It is found that λ−1 increases gradually with raising temperature or increasing excluded-volume strength.

Polymacromonomer Consisting of Polystyrene. Light Scattering Characterization in Cyclohexane