Abstract
Taking account of the effect of the large side group, the expression of the unperturbed mean-square radius of gyration, S2, is improved from the Lagrange relation. Using the derived relation, the ratio curve, S2/x vs. the logarithm of degree of polymerization x for the atactic poly(methyl methacrylate) (A-PMMA) chain, gives a small bump, which agrees better with experiment data. The characteristic ratio S2/2xl2 and the temperature coefficient dlnS2/dT dependence on the stereoirregularity are also investigated by the derived formula.
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