关键词: 离子液体, 交联剂, 膜, 电导率

Abstract: A new basic dicationic morpholine ionic liquid (IL) was synthesized with Bromodecane, morphline and 1, 4-dibromobutane via a two-step procedure. The structure of new IL was characterized by FTIR, ¹HNMR spectra and the thermal stability was analyzed by TGA. The alkalinity and solubility of the dicationic IL were also measured. Meanwhile, a series of anion exchange membrane (QCS/[Nbmd]OH) were prepared by the casting method with quaternized chitosan (QCS) as raw material and the alkaline ionic liquids ([Nbmd]OH) as dopants. The structure, thermal stability and morphology of the composite membrane prepared in this paper were characterized by FTIR, TGA and SEM. Then the influence of dopping amount of ionic liquid on the water content, mechanical properties and conductivity of the composite membrane was also investigated. It was showed that the water content, ion exchange capacity, anionic conductivity increased and tensile strength, elongation at break decreased with the increases of amount ionic liquids ([Nbmd]OH) in the membranes. The anionic conductivity, tensile strength, ion exchange capacity, water content and wet-swelling rate could respectively reach 1.17 ×10^-2 S/cm, 11.8 MPa, 1.26 mmol/g, 320% and 236% at 70℃ and the mass fraction of ionic liquids of 30%.

Key words: ionic liquid, crosslinking agent, membranes, anionic conductivity