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Hypercritically enhanced distortion of a phase diagram: The (polystyrene + acetaldehyde) system

✍ Scribed by Luís P. N. Rebelo; Hermínio C. De Sousa; W. Alexander Van Hook

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
189 KB
Volume
35
Category
Article
ISSN
0887-6266

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✦ Synopsis

We report new experimental evidence of the existence of double critical points in a binary system. Pressure-temperature data on the solubility of (polystyrene / acetaldehyde) were obtained using a low-angle light-scattering technique. Phase diagrams change from an UCST/LCST configuration showing a marked double maxima to an hour-glass shape with a ''window of miscibility'' as pressure decreases. Successful modeling of these unusual shapes was achieved by using a computation algorithm which incorporates a temperature-and concentration-dependent interaction parameter.

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