The preparation of 20–40 g. quantities of sharply defined fractions of poly‐α‐methylstyrene, for use as standards in the correlation of molecular weight methods, is described. The procedure involves a moderately careful synthesis and fractionation. Differences in the light‐scattering second virial coefficient appear to be indicative of differences in the stereoregularity of the polymers prepared by different initiators. The intrinsic viscosities of all of the polymers studied are expressed by a Mark‐Houwink equation that is the same in all cases.
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Burge et al. (1963) studied this question.
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