物理化学学报 >> 2001, Vol. 17 >> Issue (08): 757-760.doi: 10.3866/PKU.WHXB20010819

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聚合物-溶剂-超临界CO2三元体系的相行为

曹维;刘鑫;张敬畅   

  1. 北京化工大学理学院,北京 100029
  • 收稿日期:2001-01-10 修回日期:2001-03-28 发布日期:2001-08-15
  • 通讯作者: 张敬畅 E-mail:caowl@buct.edu.cn

Phase Behavior of Polymer-solvent-supercritical CO2 Ternary System

Cao Wei-Liang;Liu Xin;Zhang Jing-Chang   

  1. College of Science, Beijing University of Chemical Technology, Beijing 100029
  • Received:2001-01-10 Revised:2001-03-28 Published:2001-08-15
  • Contact: Zhang Jing-Chang E-mail:caowl@buct.edu.cn

摘要: 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.

关键词: 溶解度, 超临界CO2, 相行为

Abstract: 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 polymer-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 sensitive to different polymers.

Key words: Solubility, Supercritical CO2, Phase behavior