Iranian Polymer Journal ( IF 2.4 ) Pub Date : 2021-07-22 , DOI: 10.1007/s13726-021-00960-7 Ilkay Ozaytekin 1
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Abstract
Flexible membranes of poly(oxyphenylene benzimidazole) (PBIO) polymer with oxygen in the main chain were prepared. Proton conductivity was improved by sulfonation and adding magnetite to the PBIO membrane. A hydrophilic PBIO polymer/polyvinylidene difluoride (PVDF) mixture was used to prepare the membrane. DMF/acetone solvent pair was used to obtain homogeneous solutions of these two polymers. By modifying the PBIO with sulfuric acid, the PBIO membrane and PBIOsm composite membrane were obtained through sulfuric acid modification as well as the addition of magnetite. The structures of the obtained cast PBIO membranes were illuminated by FTIR, TGA, SEM, and EDX analyses. According to XRD analysis, the crystallization percentages of PBIO, PBIOs, and PBIOsm were compared and a synergistic effect of the degree of crystallization on the ability of the ion exchange was observed. The highest degree of crystallinity was determined at 79% for PBIOsm. Upon the addition of magnetite, the water-holding capacity and proton conductivity of the PBIO membranes increased. The proton conductivity values were measured at 90, 120, and 140 °C. The proton conductivity was found to be higher in the sulfonated PBIOs and sulfonated-magnetite doped membranes. The highest proton conductivity of 36.78 mS/cm was obtained from the combination of sulfuric acid and PBIOsm composite membrane. The proton conductivity of the PBIO membrane was measured to be 36.61 mS/cm.
Graphic abstract
中文翻译：
通过磺化和磁铁矿添加提高聚（氧亚苯基苯并咪唑）膜的质子电导率
摘要
制备了主链含氧的聚(氧亚苯基苯并咪唑)(PBIO)聚合物柔性膜。通过磺化和向 PBIO 膜添加磁铁矿来提高质子电导率。亲水性 PBIO 聚合物/聚偏二氟乙烯 (PVDF) 混合物用于制备膜。DMF/丙酮溶剂对用于获得这两种聚合物的均匀溶液。通过硫酸改性PBIO，通过硫酸改性并添加磁铁矿得到PBIO膜和PBIOsm复合膜。获得的浇铸 PBIO 膜的结构通过 FTIR、TGA、SEM 和 EDX 分析进行照明。根据XRD分析，PBIO、PBIOs、比较了 PBIOsm 和 PBIOsm，观察到结晶度对离子交换能力的协同作用。PBIOsm 的最高结晶度为 79%。添加磁铁矿后，PBIO 膜的持水能力和质子电导率增加。在 90、120 和 140 °C 下测量质子电导率值。发现磺化 PBIO 和磺化磁铁矿掺杂膜的质子传导率更高。硫酸和 PBIOsm 复合膜的组合获得了 36.78 mS/cm 的最高质子电导率。PBIO 膜的质子传导率经测量为 36.61 mS/cm。PBIO 膜的持水能力和质子电导率增加。在 90、120 和 140 °C 下测量质子电导率值。发现磺化 PBIO 和磺化磁铁矿掺杂膜的质子传导率更高。硫酸和 PBIOsm 复合膜的组合获得了最高的质子电导率 36.78 mS/cm。PBIO 膜的质子传导率经测量为 36.61 mS/cm。PBIO 膜的持水能力和质子电导率增加。在 90、120 和 140 °C 下测量质子电导率值。发现磺化 PBIO 和磺化磁铁矿掺杂膜的质子传导率更高。硫酸和 PBIOsm 复合膜的组合获得了最高的质子电导率 36.78 mS/cm。PBIO 膜的质子传导率经测量为 36.61 mS/cm。
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