Effects of additives on dissolution of cellobiose in aqueous solvents

Effects of additives on dissolution of cellobiose in aqueous solvents
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添加剂对纤维二糖在水性溶剂中溶解的影响

DOI:
10.1007/s10570-015-0627-x
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发表时间:
2015-04
期刊:
影响因子:
5.7
通讯作者:
Huang Yong
Huang Yong
中科院分区:
材料科学2区
文献类型:
--
作者:
Liu Zhijing;Zhang Chao;Liu Ruigang;Zhang Wushou;Kang Hongliang;Che Ning;Li Pingping;Huang Yong

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纤维二糖被用作纤维素的模型化合物以研究在具有添加剂的水性体系中的溶解。纤维二糖在碱溶液中的溶解是一个典型的放热的热力学驱动过程,证实了较低的温度有利于纤维素在NaOH水溶液体系中的溶解。OH−通过形成纤维二糖-OH −氢键复合物在纤维二糖溶解中起重要作用。在水溶液中添加剂与纤维二糖之间形成氢键的能力遵循NaOH/尿素/ZnO > NaOH/尿素/NaAlO 2> NaOH/尿素> NaOH的顺序。OH−、尿素的氨基、Na+水合物和纤维二糖之间的直接相互作用导致纤维二糖、OH−、Na+水合物和尿素之间形成稳定的氢键复合物。ZnO或NaAlO 2的加入可以提高溶剂体系对纤维素的溶解能力。本工作阐明了纤维素在水溶液体系中与添加剂通过氢键相互作用的相互作用和溶解机制。
Cellobiose was used as a model compound for cellulose to study dissolution in aqueous systems with additives. The dissolution of cellobiose in alkali solutions is a typical exothermic enthalpy-driven process, confirming that lower temperature is beneficial for dissolution of cellulose in NaOH aqueous systems. OH−plays an important role in cellobiose dissolution by forming cellobiose–OH−hydrogen-bonded complexes. The ability to form hydrogen bonds between additives and cellobiose in aqueous solutions follows the order NaOH/urea/ZnO > NaOH/urea/NaAlO2> NaOH/urea > NaOH. Direct interactions between OH−, amino groups of urea, Na+hydrates, and cellobiose result in stable hydrogen-bonding complexes among cellobiose, OH−, Na+hydrates, and urea. Addition of ZnO or NaAlO2can promote the dissolution power of the solvent system for cellulose. This work clarifies the interactions and dissolution mechanisms of cellulose in aqueous solution systems with additives through hydrogen-bonding interactions.
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