聚合物-溶剂-超临界CO_2三元体系的相行为

研究了聚合物－超临界二氧化碳二元体系溶解性，并考查了添加共溶剂对溶解性的影响，结果表明，添加共溶剂会大大提高ＣＯ２的溶解度．此外，还研究了聚合物－溶剂－超临界二氧化碳三元体系在高压时的相行为，探讨了组分性质、含量等对温度 压力相图的影响．随着ＣＯ２含量的增加，压力－温度相图Ｌ－ＬＶ（单一液相向液气两相共存）边界线的斜率会出现突变点，发生由Ｌ－ＬＶ边界线向Ｌ－ＬＬ（单一液相向液液两相共存）边界线的过渡，而Ｌ－ＬＶ边界线对不同聚合物并不敏感．

Phase Behavior of Polymer-Solvent-Supercritical CO_2 Ternary System

The solubility of polymer-supercritical CO2 binary systems was studied, and the effects of co-solvent on the solubility were discussed. The polymers used in this experiment were from commercial coating resins, and AR toluene and cyclohexane produced domestically were used as co-solvent. The results show that the addition of co-solvent increases the solubility remarkably (see Tab. 1). The high-pressure phase behavior of poly- mer- solvent-supercritical CO2 ternary systems was also investigated experimentally. The effects of component's character and their concentration on p - T Phase diagram were discussed. It was found that as CO2 concentration increases, the diagram changed from L-LV boundary to steeper L-LL boundary. the L-LV boundary was not sen- sitive to different polymers.