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(Liquid  +  liquid) equilibria of (polystyrene  +  nitroethane). Molecular weight, pressure, and isotope effects

✍ Scribed by Hermı́nio C. de Sousa; Luı́s P.N. Rebelo

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
359 KB
Volume
32
Category
Article
ISSN
0021-9614

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✦ Synopsis

We report experimental cloud-point and spinodal data on the solubility of (polystyrene + nitroethane) as a function of temperature (265 < T /K < 345), weight fraction of polystyrene (0 < w ps < 0.30), pressure (0 < p/MPa < 6.5), polystyrene (PS) molecular weight (13 000 < M w /a.m.u. < 130 000), and H/D isotope substitution on PS and/or nitroethane. A new high-precision apparatus based on a LASER light scattering technique was built and is described. Only phase transitions of the UCS type have been experimentally observed. Apparently, nitroethane degrades at high temperatures (T ≈ 420 K). Results show that the effects of increasing pressure or increasing the degree of deuteration on the polymer increase miscibility. In contrast, solvent deuteration decreases miscibility. Nitroethane seems to be a theta-solvent for polystyrene and therefore does not present any hypercritical temperature within the range of conditions of the experimental measurements, which have included the study of solutions slightly under tension.

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