Synthesis of Gemini Basic Ionic Liquids and Its Application for Anion Exchange Membranes Based on Pyridine Functionalized Poly(vinyl alcohol)

Yi-fu Wang; He-ting Wan; Dan Wang; Ji-lin Wang; Lu-lu Wang; Rui-jiang Feng

doi:10.11777/j.issn1000-3304.2017.17150

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Synthesis of Gemini Basic Ionic Liquids and Its Application for Anion Exchange Membranes Based on Pyridine Functionalized Poly(vinyl alcohol)

Research Article | 更新时间：2021-01-26

- Synthesis of Gemini Basic Ionic Liquids and Its Application for Anion Exchange Membranes Based on Pyridine Functionalized Poly(vinyl alcohol)
- Acta Polymerica Sinica Issue 4, Pages: 541-552(2018)
- 作者机构：
  
  辽宁石油化工大学化学化工与环境学部抚顺 113001
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.17150
  CLC：
- Published：20 April 2018，
  
  Received：5 June 2017，
  
  Revised：4 July 2017，
扫描看全文
Yi-fu Wang, He-ting Wan, Dan Wang, Ji-lin Wang, Lu-lu Wang, Rui-jiang Feng. Synthesis of Gemini Basic Ionic Liquids and Its Application for Anion Exchange Membranes Based on Pyridine Functionalized Poly(vinyl alcohol). [J]. Acta Polymerica Sinica (4):541-552(2018)
DOI：

Yi-fu Wang, He-ting Wan, Dan Wang, Ji-lin Wang, Lu-lu Wang, Rui-jiang Feng. Synthesis of Gemini Basic Ionic Liquids and Its Application for Anion Exchange Membranes Based on Pyridine Functionalized Poly(vinyl alcohol). [J]. Acta Polymerica Sinica (4):541-552(2018) DOI： 10.11777/j.issn1000-3304.2017.17150.

摘要

通过两步法合成具有Gemini结构的碱性十二烷基吗啉离子液体（[Nbmd]OH）.并将制得的离子液体引入吡啶功能化聚乙烯醇（PVA-FP）为基质的阴离子交换膜制备过程中，通过流延法制备PVA-FP/[Nbmd]

OH复合膜.借助傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、X射线衍射（XRD）、交流阻抗（AC）、热重分析（TGA）及机械性能测试等对复合膜的结构及理化性能进行表征.结果表明，该系列复合膜形貌平整均一，吡啶基团的引入增强了PVA基质膜的热稳定性及耐碱稳定性.[Nbmd]OH离子液体的引入，在提供更多阳离子活性点位的同时，降低了复合膜结晶度，提高了电导率，改善了机械性能.其中，当质量比

（PVA）：

（[Nbmd]OH）=1：2.5时，复合膜的热分解温度较PVA膜提高75℃；70℃时电导率达到4.42×10

-2

S·cm

-1

；在80℃，6 mol/L KOH溶液中进行加速老化实验，浸泡400 h后电导率为初始电导率的1.6倍左右，表现出优异的耐碱稳定性；在30 ℃，3 mol/L甲醇溶液中甲醇透过率仅为Nafion

-117膜的2.5%~5%，表现出很好的阻醇性能.

Abstract

A new Gemini basic morpholine ionic liquid (IL

[Nbmd]OH) was synthesized with morphline

bromodecane and 1

4-dibromobutane

via

a two-step procedure. The structure of the new IL was characterized by

H-NMR and FTIR. A series of anion exchange membranes (PVA-FP/[Nbmd]OH) were prepared by casting method with pyridine functionalized poly(vinyl alcohol) as the polymer matrix. The PVA-FP/[Nbmd]

OH composite membranes were characterized in details by AC-impedance spectroscopy

Fourier transform infrared spectroscopy (FTIR)

X-ray diffraction (XRD)

scanning electron microscopy (SEM)

thermal gravimetric analysis (TGA) and tensile strength test. The results indicated that PVA-FP/[Nbmd]OH composite membranes have uniform morphology

and the introduction of pyridine groups enhance the thermal stability and alkali resistance of PVA matrix

due to the formation of the hyper conjugation structure between

bond (C-H bond in methyl group) and

-bond conjugated region (pyridine group)

therefore enlarging the conjugated region

decreasing the positive charge density of the cations. Meanwhile

[Nbmd]OH ionic liquid not only provided more cationic active sites but also reduced the crystalline of the composite membranes

resulting in an increase of OH

conductivity and an improvement of the mechanical properties. When the weight ratio of[Nbmd]OH to PVA was 2.5

the thermal decomposition temperature of the composite membrane was 75℃ higher than that of the pristine PVA membrane; the maximum OH

conductivity was found at about 4.42×10

-2

S·cm

-1

at 70℃; no obvious decrease in OH

conductivity was observed for the composite membrane after immersing in 6 mol/L KOH solution at 80℃. On the contrary

the OH

conductivity was improved to 1.6 times of the initial OH

conductivity after 400 h immersion time

showing an excellent alkali resistance stability. In addition

the methanol permeability of the composite membrane determined using 3 mol/L methanol solution at 30℃ was only about 2.5%-5% of the commercial Nafion

-117 membrane under the same test conditions

indicating a promising potential use in alkaline direct methanol fuel cells.

关键词

阴离子交换膜聚乙烯醇离子液体耐碱稳定性甲醇透过率

Keywords

Anion exchange membranePoly(vinyl alcohol)Ionic liquidAlkali resistance stabilityMethanol permeability

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