Preparation and characterization of high ionic conducting alkaline non-woven membranes by sulfonation

A novel method has been proposed for the preparation of alkaline, high ionic conducting membrane separators with lower cost using non-woven polypropylene/polyethylene (PP/PE) core–shell sheet membranes. Sulfonation was employed to enhance the membrane anionic conductivity by improved hydrophilicity and more amorphous structure of the polymer. The characteristic properties of these membrane separators have been studied by ac impedance, contact angle measuring system, differential scanning calorimeter (DSC), thermogravimetric analysis (TGA), infrared spectroscopy (IR), elemental analysis (EA), stress–strain test, X-ray diffraction (XRD) and scanning electron microscope (SEM). The incorporation of sulfonic acid groups in the polymer membranes was evidenced by the IR spectroscopy. The results showed that the sulfonation treatment reaction was very effective in increasing the surface hydrophilicity of the non-woven membranes. The suitable sulfonation process could increase the room temperature anionic conductivity of the membranes from 0.0088 to 0.0175 S cm−1. The sulfonated membranes showed limited decline in thermal resistance (4%) and mechanical strength (21%). In addition, the further study on the solid-state zinc-air cells assembled from these membrane separators also exhibited an improved battery power density by 69%, from 16 to 27 mW/cm2.

[1]  Chun–Chen Yang,et al.  Preparation and characterization of PVA/PAA membranes for solid polymer electrolytes , 2006 .

[2]  Chun–Chen Yang,et al.  Study of ionic transport properties of alkaline poly(vinyl) alcohol-based polymer electrolytes , 2005 .

[3]  Jyoji Ihata Formation and reaction of polyenesulfonic acid. I. Reaction of polyethylene films with SO3 , 1988 .

[4]  K. Schmidt-Rohr,et al.  Characterization of a Major Fraction of Disordered All-Trans Chains in Cold-Drawn High-Density Polyethylene by Solid-State NMR , 2006 .

[5]  P. Gómez‐Romero,et al.  Sulfonated poly(2,5-benzimidazole) (SABPBI) impregnated with phosphoric acid as proton conducting membranes for polymer electrolyte fuel cells , 2004 .

[6]  D. Bergbreiter,et al.  Annealing and reorganization of sulfonated polyethylene films to produce surface-modified films of varying hydrophilicity , 1991 .

[7]  C. Fonseca,et al.  Sulphuric acid etching of polyethylene surfaces , 1985 .

[8]  S. Brückner,et al.  X-ray scattering , 1999 .

[9]  R. D. Falb,et al.  THREE YEARS' EXPERIENCE IN VIVO AND IN VITRO WITH SURFACES AND DEVICES TREATED BY THE HEPARIN COMPLEX METHOD , 1972, Transactions - American Society for Artificial Internal Organs.

[10]  Takeshi Kobayashi,et al.  Proton-conducting polymers derived from poly(ether-etherketone) and poly(4-phenoxybenzoyl-1,4-phenylene) , 1998 .

[11]  Hisaya Sato,et al.  Sulfonation of Poly(propylene) Films with Fuming Sulfuric Acid , 2005 .

[12]  B. Smitha,et al.  Solid polymer electrolyte membranes for fuel cell applications¿a review , 2005 .

[13]  S. Han,et al.  Thermal degradation of crosslinked high density polyethylene , 1999 .

[14]  C. Linder,et al.  Intermediate reverse osmosis ultrafiltration (RO UF) membranes for concentration and desalting of low molecular weight organic solutes , 1989 .

[15]  G. Sasikumar,et al.  Optimum Nafion content in PEM fuel cell electrodes , 2004 .

[16]  Jean-François Fauvarque,et al.  Electrochemical properties of an alkaline solid polymer electrolyte based on P(ECH-co-EO) , 2000 .

[17]  Hiroshi Tanaka 13C NMR spectra and magnetic relaxation times of isotactic polypropylene treated with fuming nitric acid , 1995 .

[18]  H. Mantsch,et al.  FT-IR PAS DEPTH PROFILING INVESTIGATION OF POLYETHYLENE SURFACE SULFONATION , 1996 .

[19]  Keonkuk Kim,et al.  Preparation and evaluation of sulfonated-fluorinated poly(arylene ether)s membranes for a proton exchange membrane fuel cell (PEMFC) , 2004 .

[20]  J. Karger‐Kocsis,et al.  Polypropylene : structure, blends and composites , 1995 .

[21]  J. Varga Crystallization, melting and supermolecular structure of isotactic polypropylene , 1995 .

[22]  J. Karger‐Kocsis Polypropylene : an A-Z reference , 1999 .

[23]  F. Picchioni,et al.  Ionomeric membranes based on partially sulfonated poly(styrene): synthesis, proton conduction and methanol permeation , 2000 .

[24]  F. Lam,et al.  Study of selected thermal characteristics of polypropylene/polyethylene binary blends using DSC and TGA , 2002 .

[25]  B. Smitha,et al.  Synthesis and characterization of proton conducting polymer membranes for fuel cells , 2003 .

[26]  Dukjoon Kim,et al.  Sulfonated polystyrene grafted polypropylene composite electrolyte membranes for direct methanol fuel cells , 2003 .

[27]  Xianfeng Li,et al.  Electrochemical properties of sulfonated PEEK used for ion exchange membranes , 2005 .

[28]  Kang Li,et al.  Preparation of porous PVDF hollow fibre membrane via a phase inversion method using lithium perchlorate (LiClO4) as an additive , 2005 .

[29]  H. Tada,et al.  Conformational change restricted selectivity in the surface sulfonation of polypropylene with sulfuric acid , 1997 .