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高等学校化学研究 ›› 2009, Vol. 25 ›› Issue (4): 585-589.

• Articles • 上一篇    下一篇

Synthesis of Poly[2,2′-(m-phenylene)-5,5′-bibenzimidazole] andPoly(2,5-benzimidazole) by Microwave Irradiation

HE Rong-huan*, SUN Bao-ying, YANG Jing-shuai and CHE Quan-tong   

  1. Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110004, P. R. China
  • 收稿日期:2008-05-07 修回日期:2008-06-21 出版日期:2009-07-25 发布日期:2009-10-16
  • 通讯作者: HE Rong-huan. E-mail: herh@mail.neu.edu.cn
  • 基金资助:

    Supported by the National High Technology Research and Development Program of China(No.2006AA03Z224) and the Program of New Century Excellent Talents in Universities of China(No.NCET-04-0277).

Synthesis of Poly[2,2′-(m-phenylene)-5,5′-bibenzimidazole] andPoly(2,5-benzimidazole) by Microwave Irradiation

HE Rong-huan*, SUN Bao-ying, YANG Jing-shuai and CHE Quan-tong   

  1. Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110004, P. R. China
  • Received:2008-05-07 Revised:2008-06-21 Online:2009-07-25 Published:2009-10-16
  • Contact: HE Rong-huan. E-mail: herh@mail.neu.edu.cn
  • Supported by:

    Supported by the National High Technology Research and Development Program of China(No.2006AA03Z224) and the Program of New Century Excellent Talents in Universities of China(No.NCET-04-0277).

Abstract:

A rapid way assisted by microwave irradiation was proposed to synthesize poly[2,2′-(m-phenylene)-  5,5′-bibenzimidazole](PBI) and poly(2,5-benzimidazole)(ab-PBI). Synthesis of PBI in polyphosphoric acid is conducted for 20 h or even more. Under microwave irradiation, the polycondensations could be completed in polyphosphoric acid within 3 h from 3,3′-diaminobenzidine tetrahydrochloride(DAB·4HCl·2H2O) and isophthalic acid for PBI, and from 3,4-diaminobenzoic acids(DABA) for ab-PBI, respectively. The conditions for the polymerization including the power of microwave irradiation, temperature, heating time, and concentrations of the reactants in polyphosphoric acid were optimized. The inherent viscosity of the polymers in concentrated sulfuric acid at 30 °C was 0.9766 dL/g for PBI, and 0.6480 dL/g for ab-PBI, respectively. Characterization of the polymer products was made by nuclear magnetic resonance(1H NMR), Fourier transform infrared spectra(FTIR) and thermogravimetric analysis(TGA).

Key words: Microwave irradiation; Polybenzimidazole; Polycondensation; Synthesis