Chemical Industry and Engineering Progress ›› 2021, Vol. 40 ›› Issue (4): 2270-2277.DOI: 10.16085/j.issn.1000-6613.2020-0940

• Fine chemicals • Previous Articles     Next Articles

Water effects on physicochemical properties of protic ionic liquid with N-hexylamine as cation and bis(trifluoromethylsulfonyl) imide as anion

LIU Zheng1(), LIU Ran2, HUA Er1,3,4(), JI Jianlong5()   

  1. 1.Chemical Science and Engineering College, North Minzu University, Yinchuan 750021, Ningxia, China
    2.College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
    3.Key Laboratory of Chemical Engineering and Technology, State Ethnic Affairs Commission, Yinchuan 750021, Ningxia, China
    4.Ningxia Key Labaratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, Ningxia, China
    5.College of Information and Computer, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
  • Received:2020-05-28 Online:2021-04-14 Published:2021-04-05
  • Contact: HUA Er,JI Jianlong

水分含量对正己胺-Tf2N型质子化离子液体物理化学性质的影响

刘铮1(), 刘燃2, 花儿1,3,4(), 冀健龙5()   

  1. 1.北方民族大学化学与化学工程学院,宁夏 银川 750021
    2.太原理工大学机械与运载工程学院,山西 太原 030024
    3.国家民委化工技术基础重点实验室,宁夏 银川 750021
    4.宁夏太阳能化学转化技术重点实验室,宁夏 银川 750021
    5.太原理工大学信息与计算机学院,山西 太原 030024
  • 通讯作者: 花儿,冀健龙
  • 作者简介:刘铮(1996—),女,硕士研究生,研究方向为离子液体。E-mail:1003056055@qq.com
  • 基金资助:
    北方民族大学科技创新类重点科研项目(2019 KJ13);国家自然科学基金(51705354)

Abstract:

The effect of water content (w0=0.12, 0.23, 0.47, 0.74, 1.0, 1.28) on physicochemical properties such as density, dynamic viscosity and electric conductivity of HHexam(Tf2N) composed of hexylamine(Hexam) cation and bis(trifluoromethylsulfonyl) imide (Tf2N) anion was studied in the temperature range of T = 303.15~353.15K. In this study, Hexam was Br?nsted base and HTf2N was Br?nsted acid. HHexam(Tf2N) dissolved a small amount of water 6.33% (corresponding to w0=[H2O]/[PIL]=1.44) as it was hydrophobic. The density, dynamic viscosity decreased and the electric conductivity increased with increasing water content at the same temperature range. Meanwhile, the density linearly decreased, dynamic viscosity exponentially decreased, and the electric conductivity exponentially increased with increasing temperature at the same water content. The Walden lines for HHexam(Tf2N) with w0=0.12—1.28 water content were in ΔW=0.5—1.0 range, implying that they could offer a better ionicity. The maximum transconductance (2.79mS) of PEDOT OECT fabricated in HHexam (Tf2N) was 3.4 times as that (0.832mS) of PEDOT:PSS OECT fabricated in aqueous solution at -0.6V of the drain potential.

Key words: protic ionic liquid, water effect, dynamic viscosity, electric conductivity, ionicity

摘要:

通过Br?nsted酸碱中和反应,合成了由碱正己胺(hexylamine, Hexam)与酸双三氟甲基磺酰亚胺[bis(trifluoromethylsulfonyl) imide,HTf2N]形成的质子化离子液体(protic ionic liquids, PILs),简称为HHexam(Tf2N)型PILs,其疏水性较强,但仍溶解少量水,其中饱和水含量可达6.33% (w0=[H2O]/[PIL]=1.44 )。PILs中水分含量的多少对其物理化学性质影响较大,因此本研究在温度T=303.15~353.15K的范围内、不同含水量(w0=0.12、0.23、0.47、0.74、1.0、1.28)条件下,测定了HHexam(Tf2N)的密度、黏度及电导率。结果显示,在相同温度条件下,随着水分含量的增加,其密度和黏度值均降低,电导率升高。在相同含水量条件下,随着温度的升高,其密度值呈直线下降,黏度均呈指数下降趋势,电导率均呈指数上升趋势,并且lnη、lnσ与1000/T之间基本呈线性关系,基本符合Arrhenius方程。在w0=0.12~1.28 范围内,HHexam(Tf2N)的Walden线均在ΔW=0.5~1.0内,离子性较好,并且随着水分含量的增加,其Walden线靠近KCl理想线,即离子化程度增大。另外,当漏极电压为-0.6V时,由HHexam(Tf2N)制备的聚(3,4-亚乙二氧基噻吩)有机电化学晶体管(PEDOT OECT)的最大跨导(2.79mS)为水溶液获得的PEDOT:PSS OECT最大跨导(0.832mS)的3.4倍。

关键词: 质子化离子液体, 水分影响, 黏度, 电导率, 离子性

CLC Number: 

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