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Polyimide membranes for pervaporation (Ⅱ) The chemical structure of polyimide pervaporation performance of membranes

The BTDA-ODA in the density, the average molecular chain spacing and free volume small. However,[link widoczny dla zalogowanych], because the molecules PMDA BTDA much larger than the second anhydride molecules in the benzene ring to ask a bridging carbonyl, leading to the difference between ODA and MDA significantly reduced. 3 Conclusion 6 different structures were synthesized polyimide film determined its physical properties and pervaporation performance. Experimental results show that as the liquid temperature, the permeation flux increased while the separation factor changed little. The same dianhydride unit PI, the diamine unit in accordance with the PDA, OI) A,[link widoczny dla zalogowanych], MI) A sequence, average spacing and free volume increase, gradually piling up loose chains, the density decreases, pervaporation separation factor but also with the PDA, ODA, MI) A decrease in the order, the flux increased. In addition, PMI) A series of rigid PI series in BTDA PI, the higher the glass transition temperature, pervaporation flux with temperature higher than the corresponding rate of BTDA series PI. References [1] O'BrienKC, KorosWJ. PolyimidematerialasedonPY-romelliticdianhydridefortheseparationofcarbondioxideandmethanegasmixtures [J]. JMembrSei ,1988,35:217-230. [2] SykesGF, ClairAKS. Theeffectofmolecularstructureonthegastransmissionratesofaromaticpolyimides [J]. JApplPolymSci ,[link widoczny dla zalogowanych],1986,32:3725-3735. [3] Hu Gang, Cui-Xian Chen, Li set, and so on. Polyimide pervaporation membranes (I) Preparation and structure of membrane dynamic adsorption characteristics [J]. Membrane Science and Technology, 2003,23 (5) :5-9. [4] Ding Mengxian, what days of white. Polyimide new materials [M]. Beijing: Science Press ,1998.101-103. Studiesonpolyimidemembranesforpervaporation (1I) TheinfluenceofpolyimidechemicalstructureonmembranePVperformanceCHENZhen, HUGang,[link widoczny dla zalogowanych], CHENCuixian, LJJiding (DepartmentofChemicalEngineering, MembraneCenter, TsinghuaUniversity, Beijing100084,[link widoczny dla zalogowanych], China) Abstract: Sixkindsofhomogeneouspolyimidemembraneswerepreparedbytwokindsofdianhydridesandthreekindsofdiamines. Thechemicalstructuresofthesepolyimidesandthemembranespervaporationperformancewereconfirmed. TheinfluencesofpolyimiderigidityandmolecularstructureonmembranePVperformancewerediscussed. Keywords: polyimide; pervaporation; rigidity; molecularstructure notice two under the April 2004 held in Beijing, the sixth \written English Abstracts, figure caption, table questions are always used in English. The other is, a small amount of editing of the existing 2003 \Wants to buy as soon as possible with the editorial department, please contact Tel :010 -64,452,115 -80,485,240 ,010. \
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