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Preparation of carbon membrane from BDAF-PMDA polyimide and its gas separation properties
Authors： Qi Wenbo1，Wang Tonghua1*，Li Lin1，Zhang Pingping1，Sun Meiyue1，Li Jianxin2， Wang Hong 2
Units： 1.State Key Laboratory of Fine Chemicals, Carbon Research Laboratory, R&D Center of Membrane Science, School of Chemical Engineering, Dalian University of Technology, Dalian 116023, China;2.Cultivated Base of State Key Laboratory of Materials and Processes for Hollow Fiber Membrane, Tianjin Polytechnic University, Tianjin 300160, P.R.China
KeyWords： BDAF-PMDA, Polyimide, carbon membrane, chemical structure, gas separation
ClassificationCode：TQ028.8
year,volume(issue):pagination： 2012, 32(3):6-10

Abstract：

The BDAF-PMDA polyimide which synthesized with the monomer of pyromellitic acid dianhydride and 2,2-Bis [4-(4-aminophenoxy)phenyl]-hexafluoropropanane by two step method was used to prepare the  carbon membrane by the pyrolysis at the high temperature. The changes of chemical structure of BDAF-PMDA polyimide during the pyrolysis and gas separation properties of derived carbon membranes were characterized by FTIR, TG, XRD, and gas permeation tests of pure and mixed gas. Results indicate that the carbon membrane prepared from the BDAF-PMDA polyimide precursor exhibits the higher gas permeability for small gas molecules, especially for CO2 which can be permeated faster than H2 in the mixture of CO2/H2. With the increase of carbonization temperature, the pore size of carbon membrane decreased. As a result, the gas permeability of the derived carbon membrane was reduced and the gas selectivity was enhanced. And the separation mechanism of BDAF-PMDA carbon membrane was changed from the surface diffusion mechanism into the coexistence of surface diffusion and molecular sieving mechanism.

Funds：
国家自然科学基金面上与重点项目(20776024,20976021,20836006), 国家863项目2009AA03Z215，天津工业大学中空纤维膜材料与膜过程省部共建国家重点实验室培育基地开放基金

AuthorIntro：
作者简介：祁文博(1985-)，女，甘肃张掖，硕士生，从事炭材料及膜材料的研究

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