新型阴离子交换膜的制备及性能研究

发布时间：2018-03-16 05:01

  本文选题：阴离子交换膜　切入点：聚苯醚　出处：《东北大学》2014年硕士论文　论文类型：学位论文

【摘要】：碱性阴离子交换膜燃料电池(AEMFC)作为一种中低温燃料电池,具有价格低廉、甲醇透过率低、氧化速率快等优点,有着广阔的应用前景。阴离子交换膜(AEM)作为其核心组件,其性能直接影响着电池优劣。因此,研发具有高离子传导率、良好化学稳定性及机械稳定性能的阴离子交换膜具有重要意义。本文比较了几种氯甲基化或溴甲基化的不同聚合物(聚苯醚、聚醚醚酮、聚醚砜、聚醚醚砜)的成膜性能,最终选用聚苯醚(PPO)作为基体材料,制备了三种溴化度的溴化聚苯醚,并通过核磁表征其溴化度分别为132%、58%和40%。其中溴化度为132%的聚苯醚成膜性能差,不适宜作阴离子膜材料。文中以溴化度为40%的溴化聚苯醚为膜基体材料,制备了一种咪唑化聚苯醚阴离子膜、两种季铵化聚苯醚阴离子膜以及三种季磷化聚苯醚阴离子膜,并对这几类阴离子交换膜的性能进行了综合比较。制备的咪唑化聚苯醚阴离子膜在60-C下电导率可达到39 mS cm-1;该膜呈现出较好的耐碱性,在3 M KOH溶液中浸泡132 h后电导率为13 mScm-1。制备的带有三乙胺基团的季铵化聚苯醚阴离子膜呈现出较好的机械性能,其室温下的断裂拉伸强度为42.52 MPa；该膜在60℃条件下电导率为21 mS cm-1。
[Abstract]:As a medium and low temperature fuel cell, basic anion exchange membrane fuel cell (AEMFC) has many advantages, such as low cost, low methanol transmittance, fast oxidation rate and so on. Its performance directly affects the quality of the battery. Therefore, R & D has a high ion conductivity, The anion exchange membranes with good chemical and mechanical stability are of great significance. In this paper, the film forming properties of several different polymers (polyether ether, polyether ether ketone, polyether sulfone and polyether ether sulfone) with chloromethylation or bromine methylation are compared. Finally, three kinds of brominated polyphenylene ethers were prepared by using polyphenylene ether (PPO) as matrix material, and their bromination degree was 132wt% and 40wt% respectively by nuclear magnetic resonance (NMR). Among them, the film forming performance of polyphenylene ether with bromination degree of 132% was poor. In this paper, an imidazolized polyphenylene ether anion membrane, two quaternary ammonium polyphenylene ether anionic membranes and three quaternary phosphated polyphenylene ether anionic membranes were prepared with brominated polyphenylene ether (40%) as the membrane substrate. The properties of these anion exchange membranes were compared. The conductivity of the imidazolated polyphenylene ether anion membrane was 39 mS cm-1 at 60-C, and the membrane showed good alkali resistance. After being immersed in 3 M KOH solution for 132h, the conductivity was 13mScm-1.The quaternary ammonium polyphenylene ether anion membrane with triethylamine group showed good mechanical properties. The tensile strength of the film at room temperature is 42.52 MPa, and the conductivity of the film is 21 mScm-1 at 60 鈩，

本文编号：1618414