Weak-base anion exchange membranes by amination of chlorinated polypropylene with polyethyleneimine at low temperatures
Hong, J-H, Li, D. and Wang, H. (2008) Weak-base anion exchange membranes by amination of chlorinated polypropylene with polyethyleneimine at low temperatures. Journal of Membrane Science, 318 (1-2). pp. 441-444.
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Commercial chlorinated polypropylene (CPP) was aminated with polyethyleneimine (PEI) in a solvent mixture of acetone and toluene at low temperatures (30–55 °C), yielding colloidal PEI-aminated CPP suspensions and thus anion exchange membranes. The chemical structure, chemical composition, microstructure, and thermal stability of CPP and PEI-aminated CPP membranes were characterized by Fourier infrared spectroscopy (FT-IR), elemental analysis, scanning electron microscopy (SEM), thermogravimetric analysis (TG), respectively. The ion exchange capacity, water uptake, methanol uptake, and ionic conductivity of PEI-aminated CPP membranes were also determined. The PEI-CPP membranes exhibited high ionic conductivities ranging from 0.89 × 10−2 to 1.36 × 10−2 S/cm, and anion exchange capacities ranging from 7.38 to 9.33 mmol/g dry membrane while the degree of amination was raised from 50.2 to 65.3%. The water uptake of the PEI-CPP membrane increased whereas the methanol uptake dropped with the degree of amination increased. The PEI-CPP membranes developed here may be useful for a range of applications, and can be further converted into quaternary ammonium-based membranes for direct methanol alkaline fuel cells.
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|Copyright:||© 2008 Elsevier B.V.|
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