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首页> 外文期刊>Journal of Applied Polymer Science >Aerogel of Nitrate Glycerol Ether Cellulose Based on Phase Separation in Acetone/Ethanol Mixed Solvents System
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Aerogel of Nitrate Glycerol Ether Cellulose Based on Phase Separation in Acetone/Ethanol Mixed Solvents System

机译：丙酮/乙醇混合溶剂体系中基于相分离的硝酸甘油醚纤维素气凝胶

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摘要

Nitrate glycerol ether cellulose (NGEC) alcogels are formed in the ternary NGEC/acetone/ethanol system. NGEC aerogels are prepared from NGEC alcogels after solvent exchange and drying under supercritical CO2 (scCO(2)). The aerogels are prepared with various densities and porosities, relating directly to the initial ethanol content. NGEC aerogels had surface areas of up to 183 m(2) g(-1) and large mesopore volumes with a combination of large macropore volumes and a wide range of mesopore sizes. The aerogels with larger pore size distribution range, average pore diameter, and mesopore and macropore volume were obtained from system with higher ethanol content. The aerogels were further characterized by X-ray diffraction, Brunauer-Emmett-Teller analysis, electron microscopy, and thermogravimetric analysis. The results showed that the NGEC aerogels clearly retained the crystalline structure from NGEC. Compared with NGEC powders, the thermal decomposition of NGEC aerogel is accelerated and this process becomes more acute. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41405.
机译：在三元NGEC /丙酮/乙醇体系中形成硝酸甘油醚纤维素（NGEC）醇凝胶。 NGEC气凝胶由溶剂交换后在超临界CO2（scCO（2））下干燥后由NGEC凝胶制备而成。制备具有各种密度和孔隙率的气凝胶，其直接与初始乙醇含量有关。 NGEC气凝胶的表面积高达183 m（2）g（-1），中孔体积大，大孔体积大，中孔尺寸范围广。从具有较高乙醇含量的体系中获得了孔径分布范围，平均孔径以及中孔和大孔体积较大的气凝胶。通过X射线衍射，Brunauer-Emmett-Teller分析，电子显微镜和热重分析进一步表征气凝胶。结果表明，NGEC气凝胶清楚地保留了NGEC的晶体结构。与NGEC粉末相比，NGEC气凝胶的热分解得以加速，并且这一过程变得更加尖锐。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41405。

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