溶解
纤维素
木质素
化学
氢氧化钠
再生纤维素
结晶度
尿素
水溶液
结晶
碱金属
牛皮纸
化学工程
材料科学
有机化学
工程类
结晶学
作者
Carolina Costa,Bruno Medronho,Alireza Eivazi,Ida Svanedal,Björn Lindman,Håkan Edlund,Magnus Norgren
标识
DOI:10.1016/j.carbpol.2021.118661
摘要
Aqueous sodium hydroxide solutions are extensively used as solvents for lignin in kraft pulping. These are also appealing systems for cellulose dissolution due to their inexpensiveness, ease to recycle and low toxicity. Cellulose dissolution occurs in a narrow concentration region and at low temperatures. Dissolution is often incomplete but additives, such as zinc oxide or urea, have been found to significantly improve cellulose dissolution. In this work, lignin was explored as a possible beneficial additive for cellulose dissolution. Lignin was found to improve cellulose dissolution in cold alkali, extending the NaOH concentration range to lower values. The regenerated cellulose material from the NaOH-lignin solvents was found to have a lower crystallinity and crystallite size than the samples prepared in the neat NaOH and NaOH-urea solvents. Beneficial lignin-cellulose interactions in solution state appear to be preserved under coagulation and regeneration, reducing the tendency of crystallization of cellulose.
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