Centre for Advanced Studies in Chemistry of Forest Products, Forest Research Institute, P.O. New Forest, Dehra Dun 248006, India.
Carbohydr Polym. 2013 May 15;94(2):843-9. doi: 10.1016/j.carbpol.2013.02.012. Epub 2013 Feb 18.
The effect on crystalline structure transformation from cellulose I to cellulose II polymorph was studied of the cotton linter treated with NaOH with and without urea as an additive, analyzed by wide-angle X-ray diffraction analysis. Cotton linter treated with increasing NaOH concentration showed at 15 wt% sudden transformation from cellulose I to cellulose II polymorph. But when urea 5 wt% was used as additive along with 15 wt% NaOH concentration the magnitude of the transformation reduced largely. The crystallinity index showed a gradual decrease with increasing concentration of NaOH. The crystallinity index showed a gradual decrease with increasing concentration of NaOH with or without addition of urea, nevertheless with addition of urea a further slight more transformation was also observed.
采用广角 X 射线衍射分析研究了氢氧化钠处理棉绒时，有无尿素作为添加剂对纤维素 I 向纤维素 II 多晶型转变的影响。随着氢氧化钠浓度的增加，用氢氧化钠处理的棉绒在 15wt%时突然从纤维素 I 向纤维素 II 多晶型转变。但是，当 5wt%的尿素作为添加剂与 15wt%的氢氧化钠浓度一起使用时，转变的幅度大大降低。结晶度指数随着氢氧化钠浓度的增加逐渐降低。结晶度指数随着氢氧化钠浓度的增加而逐渐降低，无论是否添加尿素，然而，添加尿素后，还观察到进一步的轻微转变。
