复合型季铵化聚醚砜碱性聚合物电解质膜的制备及性能

发布时间：2018-04-02 08:53

本文选题：燃料电池　切入点：阴离子交换膜　出处：《高分子学报》2017年06期

【摘要】：利用4,4?-二氟二苯砜(DFDPS)、9,9?-双(4-羟苯基)芴(BHPF)、2,2?-二(4-羟基苯基)丙烷(双酚A)及4,4?-(六氟异丙叉)双酚(双酚AF)为原料,制备了2类具有不同主链刚性的聚醚砜材料.以聚醚砜及其氯甲基化产物按一定质量比采用溶液浇铸法,制备了2类新型共混阴离子交换膜,并避免了成膜过程中的相分离现象.在高分子主链上通过引入双酚芴(BQPAES系列)及双酚A(BQPES系列)结构调整主链的刚性,探讨了主链刚性对性能的影响;表征了共混膜的离子交换容量(IEC)、吸水及溶胀特性与离子电导率,并考察了它们的耐水解和耐碱稳定性.结果表明:2种聚合物相容性良好,共混膜质地均一,柔韧透明,吸水率和溶胀率适中,均随着温度的升高逐渐增加、随着聚醚砜含量增加逐渐减小;在90?C时,离子电导率最高达到89 m S/cm.经过沸水处理24 h后,均保持高机械强度,失重率低于5%;经2 mol/L的Na OH溶液30?C处理168~240 h后离子电导率仍可保持65%~80%.由于含双酚芴结构的高分子主链具有更高的刚性,在类似IEC条件下,BQPAES膜显示了比BQPES膜更好的尺寸稳定性和化学稳定性,同时维持了较高的电导率水平.由此表明,复合处理及适度提高高分子主链的刚性,有利于提高膜的性能.
[Abstract]:Two new types of mixed anion exchange membranes were prepared by solution casting with polyethersulfone and its chloromethylation products at a certain mass ratio, and the phase separation phenomenon was avoided in the process of film formation.The influence of the rigidity of the main chain on the properties of the main chain was studied by introducing the structure of bisphenol fluorene (BQPAES series) and bisphenol A (BQPES series), and the ion exchange capacity, water absorption, swelling property and ionic conductivity of the blend membrane were characterized.Their hydrolysis resistance and alkali resistance were investigated.The results showed that the two kinds of polymers had good compatibility, uniform texture, flexibility and transparency, moderate water absorption and swelling rate, both increasing with the increase of temperature and decreasing with the increase of polyethersulfone content.The ion conductivity is up to 89ms / cm.After treatment with boiling water for 24 h, the mechanical strength was high, the weight loss rate was lower than 5, and the ionic conductivity could still be maintained at 65% after treatment with NaOH solution of 2 mol/L for 1688 ~ 240 h.Due to the higher rigidity of the main chain with diphenol-fluorene structure, the BQPAES film exhibits better dimensional and chemical stability than that of the BQPES film under similar IEC conditions, and maintains a higher conductivity level at the same time.It is shown that the composite treatment and the moderate increase of the rigidity of the main chain of the polymer are beneficial to the improvement of the performance of the membrane.
【作者单位】：南京理工大学环境与生物工程学院;
【基金】：国家自然科学基金(基金号21276128) 江苏省自然科学基金(基金号BK20141398) 中央高校基本科研业务费专项(项目号30920130121014)资助
【分类号】：TM911.4;TQ425.236

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