It is well recognized that a polymer is under theta conditions if the second virial coefficient A2 is zero and the mean square radius of gyration of the polymer is proportional to the square root of its molecular weight. For any single solvent or a mixture of solvents, this condition prevails at a certain temperature, the theta temperature. Here, the polymer chains are said to be unperturbed as they are not affected by long-range interactions. In this note we report the theta composition for chlorosulfonated polyethylene (CSP) in a solvent-nonsolvent mixture, viscometric data under theta conditions, and the expansion coefficients. Different theoretical expressions are also examined in terms of the present data.
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Das et al. (1987) studied this question.
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