摘要
首创了室温热致胆甾液晶与乙基纤维素共混富氧膜。研究发现制膜溶剂对其富氧性能有一定影响,而操作压力和温度对富氧性能有重大影响,其中操作压力的提高可以显著地加大膜的富氧浓度,而温度的升高可以显著地加大膜的富氧空气透过系数和产率。如在0.65MPa及70℃下,胆甾液晶高聚物与乙基纤维素共混的聚苯砜对苯二甲酰胺复合膜的富氧空气透过系数为1.54×10^(-9)cm^3·cm/cm^2·s·cmHg,一级富氧浓度为41%,富氧空气产率为3.0×10^(-4)ml/cm^2·s。由于这种胆甾液晶膜所需液晶含量很低,成本几乎无增加;尤其它在较高温度下仍然维持高效富氧能力,因此它比普通富氧膜具有更广阔的应用领域。
Oxygen enriching membranes are first prepared from room temperature thermotropic cholesteric liquid crystal and ethyl cellulose.The results show that the oxygen enriching properties are affected by the membrane forming solvents.The oxygen concentration increas es greatly with an increase in the operating pressure,but the permeability coefficient and pro- ductivity of oxygen enriched air increase with the temperature.Under 0.65MPa and 70C,tbe permeability coefficient of oxygen enriched air for the cholesteric liquid crystal/ethyl cellu- lose/polysulfoneamide composite membrane is 1.54×10^(-9)cm^3·cm/cm^2·s·cmHg,the oxy- gen concentration in one step is 41％,the productivity of oxygen enriched air 3.00×10(-4)ml/ cm^2·s.The unique oxygen enriched characteristics of the cholesteric liquid crystalline mem- branes with low liquid crystal content, low cost and high heat resistance lead to the practical application of such liquid crystalline membranes as oxygen enriching membranes to medical and engineering fields.
出处
《水处理技术》
CAS
CSCD
北大核心
1993年第2期57-62,共6页
Technology of Water Treatment
基金
国家青年科学基金
首届天津市21世纪青年科学基金
关键词
胆甾液晶
乙基纤维素
液晶膜
cholesteric liquid crystal
ethyl cellulose
liquid crystalline membrane
oxygen enrichment membrane
heat resistant oxygen enrichment membrane
air separation
