The solubility of cellulose in liquid ammonia/salt solutions
The solubility of cellulose in liquid ammonia/salt solutions
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纤维素在液氨/盐溶液中的溶解度
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
J. Cuculo
中科院分区：
文献类型：
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作者：
S. Hudson;J. Cuculo
讨论了纤维素在液氨和硫氰酸铵溶液中的溶解情况。报告了在一定的剪切速率和剪切应力范围内对纤维素在该溶剂中的稀溶液的粘度的测量。测量使用的是四泡Ubbelohde悬挂式液位粘度计。LOG[η]与LOG M的关系图给出了25℃时[−]的MARK-HOWINK系数为dl/g，a=0.95K=6.686×10η5。结果表明，纤维素在两种溶剂中可能具有相似的构型，而且氨水溶液也是真正的纤维素溶液。还报道了细胞-果糖/氨/硫氰酸铵溶液与有机溶剂(如甘油)的相容性。此外，简要讨论了液氨/铵盐溶液的几个有趣的特征，即方便的沸点、流变性和可获得的较高浓度的纤维素。
The dissolution of cellulose in solutions of liquid ammonia and ammonium thiocyanate is discussed. Viscosity measurements on dilute solutions of cellulose in this solvent over a range of shear rates and shear stresses are reported. A four-bulb Ubbelohde suspended level viscometer was used for the measurements. Plots of log [η] versus log M gave Mark-Houwink coefficients of a = 0.95 and K = 6.686 × 10−5 at 25°C for [η] as dl/g. The Bloomfield equation was used to calculate effective bond lengths (b) from limiting viscosity numbers of cellulose in solutions of ammonia/ammonium thiocyanate and Cuene, respectively. Results indicate that cellulose may have similar configurations in both solvents and also that the ammonia solutions are true cellulose solutions. Miscibility of the cell- ulose/ammonia/ammonium thiocyanate solutions with organic solvents, such as glycerol, is also reported. Further, a few interesting characteristics of the liquid ammonia/ammonium salt solutions, discussed briefly, are the convenient boiling point, the rheological behavior, and the relatively high concentration of cellulose obtainable.