Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (6): 943.

• Articles • Previous Articles    

Structure/Permeability Rdlationship of BPDA-based Polyimides

LI Yue-Sheng1, DING Meng-Xian2, XU Ji-Ping2   

  1. 1. Institute of Polymer Science and Engineering, Zhejiang Univerrsity, Hangzhou, 310027;
    2. Changchun Institute of Applied Chemistry, Academia Sinica
  • Received:1993-06-07 Revised:1993-09-30 Online:1994-06-24 Published:1994-06-24

Abstract: Aseries of BPDA-based polyimldes from 4, 4'-oxyl dianiline and 4, 4'-methane dianiline derivatives was prepared by a conventional procedure.Gas permeabilities and permselectivitis of 7 homoand copolyimides for gas pairs H2/N2 and O2/N2 have been measured at the temperature from ambient up to 150℃.The permeability and permselectivity of BPDA-based polyimides are dominantly controlled by free volume. BPDA-DMMDAand BPDA-TMMDAhave higher permselectivity compared with BPDA-3MPDA/ODAand BPDA-4MPDA/ODA.BPDA-DMMDAand BPDA-TMMDAwith higher permeability and permselectivity are favorablegas separation membrane materials.

Key words: Polyetherimide, Membrane, Gas separation, Permeability, Permselectivity

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