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A statistical-mechanical theory of dilute polymer solutions is developed following the solution theory of McMillan and Mayer, and the osmotic second virial coefficient A 2 is calculated taking account of the intra- and intermolecular interactions. The final expression for A 2 is expressed in terms of the molecular constants such as the molecular weight, segment size and bond length. The molecular weight dependence of A 2 is improved at least in the vicinity of the Flory point in comparison with the theories of Flory-Krigbaum and Isihara-Koyama.
Hiromi Yamakawa (Wed,) studied this question.