Dialkoxy functionalized quaternary ammonium ionic liquids as potential electrolytes and cellulose solvents

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	Dialkoxy functionalized quaternary ammonium ionic liquids as potential electrolytes and cellulose solvents
	Deng YQ(邓友全); Zhang QH(张庆华); Liu SM(刘士民); Deng YQ(邓友全)
刊名	New J. Chem.
	2011
卷号	35 页码:1596-1606
ISSN号	1144-0546
通讯作者	邓友全
中文摘要	A series of new ionic liquids, based on dialkoxy-functionalized quaternary ammonium cations {side chains: 1 = CH3, 1O1 = CH3OCH2, 1O2 = CH3OC2H4, 2O2 = C2H5OC2H4; cations: [N11,1O1,1O2], [N11,1O1,2O2], [N11,1O2,1O2], [N11,1O2,2O2] and [N11,2O2,2O2]}, with BF4_, (CF3SO2)2N_ (NTf2) and CH3CO2_ (OAc) as counteranions, have been prepared and characterized. Their basic properties, such as spectroscopic characteristics, melting point, glass transition temperature, thermal stability, electrochemical window, density, refractive index, viscosity and conductivity, were measured and comparatively studied. The incorporation of two flexible alkoxy chains makes the quaternary ammonium salts highly qualified to be low-viscous and high-conductive room temperature ILs, and even some of them have significantly better fluidity than the popular imidazolium ILs with a similar molecular weight, e.g. [N11,1O1,2O2]BF4 (151 cP and 2.11 mS cm_1, Mw: 249) vs. [HMIm]BF4 (220 cP and 1.2 mS cm_1, Mw: 256) at 25 1C. The electrochemical windows of these ILs were evaluated up to 5.5 V. In addition, the dialkoxy OAc ILs were found to have excellent solvent power for cellulose under mild conditions, e.g. a solution of 18 wt% microcrystalline cellulose in [N11,2O2,2O2]OAc at 80 ℃. By precipitation with water, the dissolved cellulose (I crystal structure) was regenerated as nanosized cellulose II particles with increased surface area and decreased crystallinity, determined by FE-SEM and XRD.
学科主题	物理化学
收录类别	SCI
资助信息	the National Natural Science Foundation of China (No. 20533080)
语种	英语
WOS记录号	WOS:000293087200004
公开日期	2012-12-04
内容类型	期刊论文
源URL	[http://210.77.64.217/handle/362003/2359]
专题	兰州化学物理研究所_绿色化学研究发展中心
通讯作者	Deng YQ(邓友全); Deng YQ(邓友全)
推荐引用方式 GB/T 7714	Deng YQ,Zhang QH,Liu SM,et al. Dialkoxy functionalized quaternary ammonium ionic liquids as potential electrolytes and cellulose solvents[J]. New J. Chem.,2011,35:1596-1606.
APA	邓友全,张庆华,刘士民,&邓友全.(2011).Dialkoxy functionalized quaternary ammonium ionic liquids as potential electrolytes and cellulose solvents.New J. Chem.,35,1596-1606.
MLA	邓友全,et al."Dialkoxy functionalized quaternary ammonium ionic liquids as potential electrolytes and cellulose solvents".New J. Chem. 35(2011):1596-1606.