摘要
用3,3′,4,4′-二苯醚四羧酸二酐(ODPA)和4,4′-二氨基二苯甲烷(MDA)为单体合成聚酰亚胺(PI)膜,测定了PI膜在单组分溶剂(甲醇、乙醇、异丙醇、叔丁醇、水)和质量分数88%双组分溶液(甲醇/水、乙醇/水、异丙醇/水、叔丁醇/水)中的溶胀特性,并考察了不同醇浓度对PI膜溶胀特性的影响.实验结果表明,PI膜在不同醇/水溶液体系中的溶胀度顺序为甲醇>乙醇>异丙醇>叔丁醇.PI膜的溶胀度(SR)和溶解选择因子(αs)均随着溶液中醇的质量分数增加呈现先增加后减小的趋势,并且膜从优先溶醇转化为优先溶水.
Polyimide （PI） membrane was made by the polymerization of 3,3＇4,4＇ -biphenyltetracarboxylic dianhydride （ODPA） and 4,4＇ - diaminodiphenylmethane （MDA） monomers. The swelling ratios （SR） of the PI membrane in unitary solvents and 88 % aqueous alcohol solutions containing different types of alcohols were determined, which are in the order of methanol 〉 ethanol 〉 isopropyl alcohol 〉 tert - butanol for both cases. The changes of SRs and the swelling selectivity factors （as） of the membrane exhibited the same trend with the increase in the alcohol concentration： first increase and then decrease. The increase in alcohol concentration also caused water to be preferentially dissolved in the membrane. A maximum valued of as can be obtained at 88 % of alcohol in aqueous solutions, which are 5. 929 and 11.73 for methanol/water and ethanol water solutions separately.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2008年第2期44-47,共4页
Membrane Science and Technology
基金
国家重点基础研究发展项目“973”计划资助(2003CB6157019)
关键词
渗透汽化
膜
聚酰亚胺
溶胀
pervaporation
membrane
polyimide
swelling
