以9,9′-双（4-氨基苯基）芴（BAPF）对聚酰胺酸（PAA（BTDA-DMMDA）,PAA-A）修饰,得到Cardo型共聚酰亚胺（PI（BTDA-BAPF-DMMDA）,PI-B）;以TiO2溶胶对其杂化,得到PI-B/TiO2系列纳米复合膜。采用扫描电镜（SEM）和X射线衍射（XRD）对PI-A、PI-B及PI-B/TiO2系列膜进行结构表征。结果表明,TiO2以纳米级别颗粒均匀分散在PI-B中,dPI-A,dPI-B,dPI-B/TiO2分别为0.4770 nm,0.4606 nm,0.4646 nm。气体渗透实验表明,H2和O2在PI-B膜中的透过系数与PI-A膜相差不大,但H2/N2及O2/N2的分离性能增至PI-A膜的2.0倍和2.2倍（达到32.38和8.369）;当TiO2溶胶含量达到24%时,H2和O2在PI-B/TiO2复合膜对透过系数为PI-A膜的3.5倍和5.9倍,达到8.959×105Pa和3.625×105Pa,H2/N2及O2/N2的分离性能增至PI-A膜的2.5倍和4.2倍,达到39.49和15.97。
Cardo ring structure of 9,9-bis（4-aminophenyl） fluorine（BAPF） was used as a co-monomer of polyamide acid（BTDA-DMMDA,PAA-A） to prepare polyimide（BTDA-BAPF-DMMDA,PI-B）and PI-B/TiO2 composite membranes were prepared by the sol-gel method.Scanning electron microscope（SEM） and X-ray diffraction（XRD） were employed to study the physical and chemical structure of the membranes.The results show that TiO2 particles desperate in PI phase homogeneously at nano-level,and d-spacing of PI-A,PI-B,PI-B/TiO2 is 0.4770 nm,0.4606 nm,0.4646 nm,respectively.The pure gas permeation experiments show adding BAPF does not affect pH2 and pO2 of PI-B membrane,but αH2/N2 and αO2/N2 is 32.37 and 8.369（2.0 and 2.2 times of PI-A membrane）;when the content TiO2 increases to 24%,pH2 and pO2 of PI-B/TiO2 is 8.965 Barrer and 3.625 Barrer（3.5 and 5.9 times of PI-A membrane） and αH2/N2 and αO2/N2 is 39.49 and 15.97（2.5 and 4.2 of PI-A membrane）,respectively.
参考文献
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