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Revised Manuscript Received May 2, 1995 Three decades ago Stockmayer1 first suggested that a flexible polymer chain can transit its conformation from an expanded coil to a collapsed globule on the basis of Flory’s mean-fieldtheory. 2 Since his prediction, theoretical and experimental studies of this coil-toglobule transition have been extensively conducted. 3-12 The majority of the reported works were based on polystyrene in various organic solvents because of two very special requirements for the studied polymer chain; namely, its molecular weight should be as high as possible and its molecular mass distribution should be as narrow as possible. Many useful experimental results have been obtained by using improved modem equipment, 11· 12 especially laser light scattering (LLS) which includes static and dynamic LLS, interpreted by a well-developed theory. 8· 9

Grosberg13 et al. in one of their recent …