以溴代正丁烷、N,N,N′,N′-四甲基胍(TMG)为原料,通过两步法合成新型氢氧型N,N,N′,N′-四甲基-N″-丁基胍离子液体([BTMG]OH).以聚乙烯醇为制膜原料、戊二醛为交联剂、离子液体[BTMG]OH为掺杂物,通过流延法制备了PVA/[BTMG-] OH复合膜.实验过程中,通过红外光谱、热重分析对所制备的复合膜的结构、热稳定性进行表征.同时考察了离子液体含量对PVA/[BTMG]OH复合膜的含水率、溶胀性能、离子交换容量、机械性能及电导率的影响.其中,当离子液体质量分数为38.07％时,复合膜具有良好的综合性能,此时膜的含水率和拉伸强度分别为139.6％和19.6 MPa;60℃时,该膜的电导率为2.33×10-2 S/cm.另外,该膜经过60℃、400 h、KOH(6 mol/L)的耐碱性测试,60℃时的电导率为2.25×10-2S/cm,降幅仅为3.3％,且外观形貌无明显变化,表现出优异的耐碱稳定性.%N,N,N′,N′-tetramethyl-N″-butyl guanidinium ionic liquids ([BTMG]OH) was synthesized with N,N,N′,N′-tetramethyl-guanidine (TMG) and 1-butyl bromide.Meanwhile,a series of anion exchange membrane(PVA/[-BTMG]OH) were prepared by the tape casting method with polyvinyl alcohol (PVA) as raw material and the alkaline ionic liquid ([BTMG]OH) as dopant,glutaraldehyde (GA) as the cross-linking agent.During the experiment,the structure of composite membrane was characterized by FTIR,and the thermal stability was analyzed by TGA.The water uptake,swelling ratio,ion exchange capacity (IEC),mechanical properties and electrical conductivity of the composite membrane were investigated with different content of [BTMG]OH.When the content of ionic liquid is 38.07％ (mass fraction),water uptake and tensile strength are 139.6％ and 19.6 MPa respectively,and the optimum electrical conductivity at 60 ℃ is 2.33 × 10-2 S/cm.In addition,after being immersed into KOH (6 mol/L) for 400 h at 60 ℃,electrical conductivity is 2.25 × 10-2 S/cm,fell by only 3.3％.With no obvious changes in morphology,it performs higth stability to alkali.
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