Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (10): 1730-1735.DOI: 10.3724/SP.J.1088.2012.20427

• Research papers • Previous Articles     Next Articles

Preparation of Hyperbranched Polyethyleneimine Composite Membrane Using Interfacial Polymerization Catalyzed by 4-Dimethylamiopryidine

ZHANG Lin1, LIN Saisai1, WEI Ping1, CHENG Lihua2,*, CHEN Huanlin1   

  1. 1Department of Chemical and Biological Engineering, Engineering Research Center of Membrane & Water Treatment Technology MOE, Zhejiang University, Hangzhou 310027, Zhejiang, China; 2Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, Zhejiang, China
  • Received:2012-06-15 Revised:2012-07-30 Online:2012-09-28 Published:2012-09-28

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Abstract: The promoting effect of 4-dimethylaminopyridine (DMAP) on the interfacial polymerization between trimesoyl chloride (TMC) and hyperbranched polyethyleneimine (PEI) was investigated. The solubility of DMAP in organic phase and aqueous phase was examined and the mass fraction of DMAP to PEI was optimized to 8%. Fourier transform infrared spectroscopy and scanning electron microscopy results showed that when catalyzed by DMAP, almost all the amino groups of PEI were cross-linked with TMC into amide groups, and thus a smooth and integrated layer was formed on the polysulfone support membrane. The rejection of PEI/TMC composite membrane against NaCl was improved to 85.4% as compared with 45.2%. Combined with the donating electron effects of 1-tertiary amine and 4-methylamino groups, the catalytic mechanism for DMAP in this PEI-based interfacial polymerization was proposed.

Key words: 4-dimethylamiopryidine, hyperbranched polyethyleneimine, interfacial polymerization, steric hindrance, composite membrane