Experimental investigation of phase equilibria in the system polystyrene/cyclohexane/carbon dioxide

被引：0

作者：

Bungert, B ^{[1
]}

Sadowski, G ^{[1
]}

Arlt, W ^{[1
]}

机构：

[1] Tech Univ Berlin, Inst Verfahrenstech, Fachgebiet Thermodynam & Therm Verfahrenstech, D-10623 Berlin, Germany

来源：

HIGH PRESSURE CHEMICAL ENGINEERING | 1999年 / 6271卷

关键词：

D O I：

暂无

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

In the present work, the influence of a dense gas (carbon dioxide) on the phase behavior of polymer/solvent systems is examined. For this purpose, a high-pressure autoclave was built which allows measurements at temperatures up to 250 degrees C and pressures up to 200 bar. Samples can be taken even from very high-viscous phases. At first, the influence of CO(2) on the LCST curve of the model system polystyrene/cyclohexane was investigated. An increasing amount of CO(2) shifts the LCST curve to lower temperatures and higher pressures. At a gas content of about 22 weight % the LCST curve merges with the UCST curve. The composition as well as the polymer distribution in each of the coexisting phases in the two-phase region was determined. The elimination of a low-molecular-weight additive from the polymer using gas-induced liquid-liquid separation is examined for the model system polystyrene/dioctyl phthalate/ cycylohexane/carbon dioxide.

引用

页码：51 / 53

页数：3

共 4 条

[1] Separation of non-volatile components by expansion with high-pressure gases [J].