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The temperature dependence of log a of poly(styrene ‐co‐ sodium methacrylate) was analyzed by means of the relation based on the free volume and the hole theories of liquids. For the near‐Tg region the relation becomes a single parameter equation of T/Tg. The analysis revealed a transition in flow pattein at TT associated with disintegration of the ion multi plets. The Tt‐transition was previously detected in other theological functions, viz, relaxation modulus, mechanical and dielectric tan δ plots.
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L. A. Utracki (1982) studied this question.
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