Sutradhar Sabuj Chandra, Yoon Sujin, Ryu Taewook, Jin Lei, Zhang Wei, Kim Whangi, Jang Hohyoun
Department of Applied Chemistry, Konkuk University, Chungju 27478, Korea.
Department of Liberal Art, Konkuk University, Chungju 27478, Korea.
Membranes (Basel). 2021 Feb 27;11(3):168. doi: 10.3390/membranes11030168.
Improved proton conductivity and high durability are now a high concern for proton exchange membranes (PEMs). Therefore, highly proton conductive PEMs have been synthesized from branched sulfonimide-based poly(phenylenebenzophenone) (SI-branched PPBP) with excellent thermal and chemical stability. The branched polyphenylene-based carbon-carbon backbones of the SI-branched PPBP membranes were attained from the 1,4-dichloro-2,5-diphenylenebenzophenone (PBP) monomer using 1,3,5-trichlorobenzene as a branching agent (0.1%) via the Ni-Zn catalyzed C-C coupling reaction. The as-synthesized SI-branched PPBP membranes showed 1.00~1.86 meq./g ion exchange capacity (IEC) with unique dimensional stability. The sulfonimide groups of the SI-branched PPBP membranes had improved proton conductivity (75.9-121.88 mS/cm) compared to Nafion 117 (84.74 mS/cm). Oxidation stability by thermogravimetric analysis (TGA) and Fenton's test study confirmed the significant properties of the SI-branched PPBP membranes. Additionally, a very distinct microphase separation between the hydrophobic and hydrophilic moieties was observed using atomic force microscopic (AFM) analysis. The properties of the synthesized SI-branched PPBP membranes demonstrate their viability as an alternative PEM material.
提高质子传导率和高耐久性是目前质子交换膜（PEMs）备受关注的问题。因此，已经通过具有优异热稳定性和化学稳定性的支化磺酰亚胺基聚（苯撑二苯甲酮）（SI-支化PPBP）合成了高质子传导性的PEMs。SI-支化PPBP膜的支化聚苯撑基碳-碳主链是由1,4-二氯-2,5-二苯撑二苯甲酮（PBP）单体使用1,3,5-三氯苯作为支化剂（0.1%），通过Ni-Zn催化的C-C偶联反应得到的。合成的SI-支化PPBP膜显示出1.00~1.86 meq./g的离子交换容量（IEC），具有独特的尺寸稳定性。与Nafion 117（84.74 mS/cm）相比，SI-支化PPBP膜的磺酰亚胺基团具有更高的质子传导率（75.9-121.88 mS/cm）。通过热重分析（TGA）和芬顿试验研究的氧化稳定性证实了SI-支化PPBP膜的显著性能。此外，使用原子力显微镜（AFM）分析观察到疏水和亲水部分之间非常明显的微相分离。合成的SI-支化PPBP膜的性能证明了它们作为替代PEM材料的可行性。
