新型聚苯并咪唑磷酸掺杂膜制备工艺的研究

发布时间：2018-03-28 22:03

  本文选题：杂萘联苯　切入点：聚苯并咪唑　出处：《西北工业大学学报》2017年04期

【摘要】：以NMP为溶剂,通过溶液浇铸法,将主链含杂萘联苯结构的聚苯并咪唑(PPBI)铺制成膜。采用不同磷酸浓度、掺杂温度和掺杂时间,对PPBI膜进行磷酸掺杂,得到不同掺杂程度的膜。PPBI膜的磷酸掺杂程度分别随着磷酸浓度、掺杂温度和掺杂时间的增加而呈现增大的趋势。当掺杂时间超过20 h,掺杂程度趋于最大值而不再随时间的增大而增大,较优掺杂时间为30 h。在180℃温度条件下14.7 M的浓磷酸中掺杂能够得到最高掺杂度(15.2 mol H_3PO_4)的PPBI膜。将不同掺杂度的膜进行力学性能、质子传导率和耐氧化性的测试,发现膜的力学性能、传导性能和耐氧化性均依赖于掺杂程度。PPBI膜的质子传导率随着磷酸掺杂程度的增大而增大,尤其在高掺杂程度下这种趋势更加明显。PPBI膜的机械强度和耐氧化性随着掺杂程度的增大而降低,此系列PPBI膜的机械强度和耐氧化性均能够满足燃料电池质子交换膜的要求。
[Abstract]:Using NMP as solvent, the polybenzimidazolium polybenzimidazolium (PPBI) with main chain structure containing naphthalene biphenyls was prepared by solution casting method. The PPBI film was doped with phosphoric acid with different phosphoric acid concentration, doping temperature and doping time. The phosphoric acid doping degree of PPBI film with different doping degree was determined with the concentration of phosphoric acid. With the increase of doping temperature and doping time, the doping degree tends to be the maximum when the doping time is more than 20 h, but no longer increases with the increase of time. The optimum doping time is 30 h. The PPBI films with the highest doping degree of 15.2 mol H _ 3PO _ 4 can be obtained by doping 14.7 M concentrated phosphoric acid at 180 鈩，

本文编号：1678243