Wang Ying, Deng Yulin
School of Chemical and Biomolecular Engineering and IPST@GT, Georgia Institute of Technology, 500 10th Street N.W., Atlanta, Georgia 30332-0620, USA.
Biotechnol Bioeng. 2009 Apr 1;102(5):1398-405. doi: 10.1002/bit.22160.
The dissolution kinetics of cellulose in sodium hydroxide in the presence and absence of urea at low temperature was studied. High molecular weight cotton linter with degree of polymerization of 850 was used for dissolution study. The cotton linter was separated from the dissolution slurry at different dissolution times, and the change of the crystal structure of cotton linter was characterized by Powder X-Ray Diffraction. The rate of decrystallization of cellulose was obtained and the activation energy for cellulose decrystallization in sodium hydroxide solution was derived using Eyring equation. The effect of urea additive was discussed.
研究了在低温下，有无尿素存在时纤维素在氢氧化钠中的溶解动力学。使用聚合度为850的高分子量棉短绒进行溶解研究。在不同溶解时间从溶解浆液中分离出棉短绒，并用粉末X射线衍射表征棉短绒晶体结构的变化。获得了纤维素的脱结晶速率，并使用艾林方程推导了纤维素在氢氧化钠溶液中脱结晶的活化能。讨论了尿素添加剂的影响。
