The equilibrium volume‐temperature relationship for solid polystyrene has been investigated by a dilatometric method. The results show that, under equilibrium conditions, the volume is a strictly linear function of the temperature in the range 50–120° and that an apparent transition point is observed only when non‐equilibrium conditions obtain, thus confirming claims of previous workers over which there has been some controversy.
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Millane et al. (1952) studied this question.
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