燃料电池用季铵化壳聚糖/纤维素全互穿网络膜的制备及性能表征

Synthesis and properties of QCS/CM full interpenetrating network anion-exchange membranes for potential fuel cells

以季铵化壳聚糖(QCS)和纤维素(CM)为原料,戊二醛(GA)为交联剂,采用化学交联法制备具有全互穿网络结构的QCS/CM阴离子交换膜,并对其热稳定性、含水率、溶胀度、机械强度、电导率以及离子交换量等相关性能进行表征.结果表明,CM的引入提高了该膜的离子交换量、电导率以及机械强度.将QCS-CM35%置于10mol/L的KOH(60℃)溶液中浸渍240h,该膜的外观、机械性能以及含水率等指标没有明显衰减,同时该膜30℃时的电导率从泡碱前的3.43×10^(-2) S/cm提高到4.60×10^(-2) S/cm,而70℃时的电导率从泡碱前的8.73×10^(-2) S/cm提高到1.009×10^(-1)S/cm.表明该膜具有良好的耐碱性.

The full interpenetrating anion exchange membranes with network structure were prepared based on quaternized-chitosan （QCS） and cellulose （CM） as materials and glutaraldehyde（GA） as crosslinkers. Thermal stability, water uptake, swelling ratio, mechanical properties, electrical conductivity and ion exchange capacity were investigated. The results show that the anionic conductivity, flexibility and mechanical property are highly improved by incorporating CM. No apparent decrease in anionic conductivity, water uptake and tensile stress was observed for the membranes after immersed in 10 mol/L KOH （60 ℃） for 240 h. On the contrary, the anionic conductivity was increased from 3.43×10^-2 S/cm （0 h） to 4.60×10^-2 S/cm （240 h） and 8. 73×10^-2 S/cm （0 h） to 1. 009×10^-1 S/cm （240 h） , which were measured at 30℃ and 70 ℃ respectively. Indicat!ng that the membranes with good alkaline resistance stability, the results are promising for potential use in alkaline direct methanol fuel cells.