【作者】 李双； 王家喜；

【Author】 Shuang Li Jiaxi WangDepartment of Polymer Science and Engineering, Hebei University of Technology,Tianjin 300130

【机构】 河北工业大学化工学院高分子科学与工程系；

【摘要】 <正> 超临界、近超临界流体,尤其是二氧化碳已被认为是环境友好的有机溶剂替代物,其应用研究越来越引起人们的注意。二氧化碳作溶剂给化工过程带来许多新的机遇,同时对现役的一些化工过程,尤其是存在严重的环境污染的工艺过程带来挑战。然而许多高极性化合物、聚合物等在超临界二氧化碳中的溶解度较小,限制了其广泛应用。对二氧化碳具有较大亲和性的两性物质的研究已引起人们的广泛兴趣。Beckman E.J.和O’Neill M.L.等较为详细地研究了许多均聚物、共聚物在超临界二氧化碳中的溶解行为,发现聚环氧丙烷聚醚片段在超临界二氧化碳中具有较大的溶解性,为了进一步研究聚环氧丙烷聚醚衍生物的结构与性能的关系,本文研究了聚环氧丙烷聚醚的端基对其溶解行为的影响。更多还原

【Abstract】 A series of modified poly(propylene oxide) derivatives, which would used as surfactant in supercritical carbon dioxide, have been synthesized. The structure and the glass-transition temperature of the surfactant were measured by FT-IR and DSC respectively. The cloud points of those materials were measured in CO2 at temperature from 35 to 65 ℃ and pressures of 7MPa-25MPa. The results indicated that different end groups have large effects on the glass-transition temperature and the cloud point. The solubility of those poly(propylene oxide) derivatives is strongly dependent upon their molecular weight. The cloud point pressure increases with the amount of the surfactant at first, then decreases with the amount of the surfactant. The solubility of the surfactant becomes sensitive to pressure as the weight of the surfactant increasing.更多还原