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Solubility of polystyrene in liquid sulfur dioxide
Author(s) -
Albihn P.,
Hedman K.,
Kubát J.
Publication year - 1979
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1979.070231001
Subject(s) - solubility , polystyrene , fractionation , extraction (chemistry) , phase (matter) , mass fraction , analytical chemistry (journal) , sulfur , supercritical fluid , chemistry , sulfur dioxide , supercritical fluid extraction , chromatography , materials science , organic chemistry , polymer
The two‐phase equilibrium in the system polystyrene (PS)‐liquid sulfur dioxide [SO 2 ( l )] was investigated, mainly at room temperature. The system consisted of an upper PS‐rich phase, concentration (30–50)% depending on the way of preparation, and a lower phase containing less than 1% PS. The range of molecular weights of the PS samples used was 22,000–350,000 (M̄ w ). PS with an M̄ w value of 22,000 dissolved homogeneously in SO 2 ( l ). In systems forming two phases a fractionation of PS with respect to molecular weight was observed. The M̄ w value of the PS fraction dissolved in the lower PS lean phase was always substantially lower than that of the upper phase. When increasing the temperature to 90–95°C, the two phases disappeared and the PS component formed a jellylike mass with a very low solubility in SO 2 ( l ). Also in the supercritical dense SO 2 gas, the solubility of PS was a few tenths of a percent only. Experiments with Soxhlet extraction indicated an extractability of a few percent.