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          • 纖維素膜實現綠色合成
          • 更新時間:2014-05-07;信息類型:國內研究進展
          • 中化新網訊 傳統粘膠法纖維素膜生產工藝將被一項名為離子液體直接溶劑法的綠色清潔新工藝所取代。上周,由中科院化學研究所和濰坊恒聯玻璃紙有限公司合作開發的綠色纖維素膜清潔生產新工藝在北京通過鑒定。專家認為,由我國科研人員首創的離子液體直接溶劑法纖維素膜新工藝符合綠色化學和清潔生產的發展要求,具有顯著的節能和環保特點,其綜合技術水平國際領先。
          • 鏈接地址:http://www.abmbags.com/research/2014-05-07/298.html
          • Dialkoxy functionalized quaternary ammonium ionic liquids as potential electrolytes and cellulose solvents
          • 更新時間:2014-04-10;信息類型:SCI論文
          • 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.
          • 鏈接地址:http://www.abmbags.com/download/article/2014-04-10/143.html
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