The inhibiting water uptake mechanism of main-chain type N-spirocyclic quaternary ammonium ionene blended with polybenzimidazole as anion exchange membrane

脱质子化 堆积 化学 氢键 静电学 分子动力学 离子交换 溶剂 化学工程 高分子化学 离子 分子 计算化学 有机化学 物理化学 生物化学 工程类
作者
Guangxu Zhang,Ruyu Li,Xin Wang,Xiaoli Chen,Yinghua Shen,Yizheng Fu
出处
期刊:Separation and Purification Technology [Elsevier BV]
卷期号:291: 120950-120950 被引量:18
标识
DOI:10.1016/j.seppur.2022.120950
摘要

• Electrostatic interactions play the key role in inhibiting water uptake. • Electrostatic interactions are affected by PBI deprotonation and its flexibility. • Weak hydrogen bonding and π-π stacking also contribute to inhibiting water uptake. Molecular dynamics (MD) and density functional theory (DFT) were utilized to evaluate the effect of deprotonation degree and flexibility of polybenzimidazole (PBI) on the inhibiting water uptake mechanism of main-chain type N-spirocyclic quaternary ammonium ionene (SI) as anion exchange membranes (AEMs). Results show that the electrostatic interactions play a key role in inhibiting water uptake of the blend membranes, which is mainly originated from the N + of SI and the N - of deprotonated PBI and partly from the inter-molecular weak hydrogen bonding C-H···N and C-H···π. The E ele between SI and PBI of SI/NP-50 and SI/NP-100 increases by 745.6% and 1291.8% compared with SI/NP-0 at λ =40, respectively, which exhibits the PBI deprotonation enhances the electrostatic interactions. And the E ele between SI and PBI increases as the flexibility of PBI decreases. Furthermore, the π-π stacking interactions contribute to the inhibiting water uptake of SI AEMs. The AEM of SI blended with low flexible poly[2,2′-(1,4-naphthalene)-5,5′-bibenzimidazoles] (NPBI) exhibits excellent dimensional stability due to strong electrostatic interactions. Our work deepens the understanding of the inhibiting water uptake mechanism of SI blended with PBI as AEMs from a microscopic viewpoint, and provides guidance for the selection of PBI structure.
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