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  • 纤维素膜实现绿色合成
  • 更新时间：2014-05-07；信息类型：国内研究进展
  • 中化新网讯 传统粘胶法纤维素膜生产工艺将被一项名为离子液体直接溶剂法的绿色清洁新工艺所取代。上周，由中科院化学研究所和潍坊恒联玻璃纸有限公司合作开发的绿色纤维素膜清洁生产新工艺在北京通过鉴定。专家认为，由我国科研人员首创的离子液体直接溶剂法纤维素膜新工艺符合绿色化学和清洁生产的发展要求，具有显著的节能和环保特点，其综合技术水平国际领先。
  • 链接地址：http://www.ionike.com/research/2014-05-07/298.html
  • Dialkoxy functionalized quaternary ammonium ionic liquids as potential electrolytes and cellulose solvents
  • 更新时间：2014-04-10；信息类型：SCI论文
  • 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 cm1, Mw: 249) vs. [HMIm]BF4 (220 cP and 1.2 mS cm1, Mw: 256) at 25 ℃. 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.
  • 链接地址：http://www.ionike.com/download/article/2014-04-10/143.html