摘要
探讨了纤维素在离子液体中的溶解,发现在室温离子液体AmimCl中纤维素发生一定程度的降解,纤维素聚合度由1276.6降低至933.8。通过纤维素均相衍生化反应发现,无需添加任何催化剂,纤维素在室温离子液体AmimCl中即可与PA发生均相衍生化反应,纤维素的取代度随反应时间、酸酐用量、反应温度的提高而提高。FT-IR和固体CP/MAS13C-NMR分析表明,反应后的纤维素衍生物中富含羧基。研究还发现,纤维素在C6、C2和C3位置的游离羟基均参与了化学反应。
Dissolution and homogeneous modification of sugarcane bagasse cellulose was performed in room-temperature ionic liquid 1-allyl-3-methylimidazolium chloride （AmimC1） with phthalic anhydride in the absence of any catalyst. The results showed the dissolution of cellulose in AmimC1 resulted in a noticeable degradation by reducing its degree of polymerization from 1276.6 to 933.8. The degree of substitution of phthalated cellulosic derivatives increased with the increment of reaction temperature, reaction time, and the molar ratio of phthalic anhydride/anhydroglucose units in cellulose under the conditions given. The products were characterized by FT - IR and solidstate CP/MAS13 NMR spectroscopy, and the results revealed that the phthalation reaction of hydroxyl groups at C - 6, C -2, and C -3 positions of the cellulose all occurred.
出处
《造纸科学与技术》
2007年第6期37-40,55,共5页
Paper Science & Technology
关键词
离子液体
纤维素
绿色溶剂
均相衍生化
ionic liquids
cellulose
green solvents
homogeneous modification
