Preparation and Conducting Behavior of Amphibious Organic/Inorganic Hybrid Proton Exchange Membranes Based on Benzyltetrazole

Abstract

Abstract: A series of novel amphibious organic/inorganic hybrid proton exchange membranes with H₃PO₄ doped which could be used under both wet and dry conditions was prepared through a sol-gel process based on acrylated triethoxysilane(A-TES) and benzyltetrazole-modified triethoxysilane(BT-TES). The dual-curing approach including UV-curing and thermal curing was used to obtain the crosslinked membranes. Polyethylene glycol(400) diacrylate(PEGDA) was used as an oligomer to form the polymeric matrix. The molecular structures of precursors were characterized by ¹H, ¹³C and ²⁹Si NMR spectra. The thermogravimetric analysis(TGA) results show that the membranes exhibit acceptable thermal stability for their application at above 200 oC. The differential scanning calorimeter(DSC) determination indicates that the crosslinked membranes with the mass ratios of below 1.6 of BT-TES to A-TES and the same mass of H₃PO₄ doped as that of A-TES possess the –T_gs, and the lowest T_g(–28.9 oC) exists for the membrane with double mass of H₃PO₄ doped as well. The high proton conductivity in a range of 9.4―17.3 mS/cm with the corresponding water uptake of 19.1%―32.8% of the membranes was detected at 90 oC under wet conditions. Meanwhile, the proton conductivity in a dry environment for the membrane with a mass ratio of 2.4 of BT-TES to A-TES and double H₃PO₄ loading increases from 4.89×10^–2 mS/cm at 30 oC to 25.7 mS/cm at 140 oC. The excellent proton transport ability under both hydrous and anhydrous conditions demonstrates a potential application in the polymer electrolyte membrane fuel cells.

Key words: Amphibious, Benzyltetrazole, Organic/inorganic hybrid membrane, Phosphorus acid, Proton conductivity

QIAO Li-gen, SHI Wen-fang. Preparation and Conducting Behavior of Amphibious Organic/Inorganic Hybrid Proton Exchange Membranes Based on Benzyltetrazole[J]. Chemical Research in Chinese Universities, 2012, 28(2): 345-352 .

References

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