Cloud‐point curves for polystyrenes of low polydispersity in cyclohexane solution

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Abstract
Cloud‐point curves and relative volumes of the coexisting phases just below the cloud‐point temperatures were observed for a commercial sample of “monodisperse” polystyrene and one of its fractions. As expected from theoretical considerations, the cloud‐point curve for the more monodisperse sample was flatter near the peak over a greater concentration range than that of the parent sample. Furthermore, the critical point for the fraction appeared to be closer to the peak of the cloud‐point curve than was that of the unfractionated polymer. In addition, it was learned that one type of impurity could be detected with extraordinary sensitivity by means of the cloud‐point curve.

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