Weak interactions and their impact on cellulose dissolution in an alkali/urea aqueous system

doi:10.1039/c7cp02514a

CORC > 武汉物理与数学研究所 > 中国科学院武汉物理与数学研究所 > 磁共振基础研究部

	Weak interactions and their impact on cellulose dissolution in an alkali/urea aqueous system
	Wang, Sen 1; Sun, Peng 2; Liu, Maili 2; Lu, Ang 1; Zhang, Lina 1
刊名	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
	2017-07-21
卷号	19 期号:27 页码:17909-17917
DOI	10.1039/c7cp02514a
文献子类	Article
英文摘要	Weak interactions, though sometimes easily ignored, play an important role in macromolecule dissolution. In this work, the characterization of weak interactions between urea and cellulose in a LiOH/urea aqueous solution was accomplished and confirmed in situ, for the first time, using PFG-SE NMR, FT-IR and solvatochromic methods, etc. The NMR results indicated the binding of urea with cellulose in the solution, demonstrating the existence of the weak interactions between them. Subsequently, the solvatochromic methods revealed that urea hardly affected the hydrogen bond donor (HBD acidity) and hydrogen bond acceptor (HBA basicity) properties of the solvent, but was related to its dipolarity and polarizability, indicating that dispersion forces existed therein, but not likely hydrogen bonding, which was also supported by the FT-IR. Furthermore, the impact of weak interactions between urea and cellulose was demonstrated to facilitate the dissolving process. The fine dispersion and good stability of cellulose in the solution were maintained by mitigating the effect of the hydrophobic portions from all the dilute, semi-dilute and concentrated regimes, supported by the results of dynamic light scattering (DLS), rheology, NMR, etc. Therefore, the transmittance and mechanical properties of the regenerated cellulose materials prepared from the cellulose solution in the alkali/urea aqueous system were enhanced, compared with those in the alkali only system. This work provided significant and new experimental insights into the non-covalent weak interactions between urea and macromolecules from the viewpoints of polymer physics and physical chemistry, which could never be ignored and underestimated. The indispensable weak interactions in the system are also important for the green conversion of natural biomass into new materials via physical processes.
WOS关键词	PHENOLATE BETAINE DYES ; TO-GLOBULE TRANSITION ; IONIC LIQUIDS ; SOLVENT POLARITIES ; RAPID DISSOLUTION ; LOW-TEMPERATURE ; NAOH SOLUTIONS ; UREA ; NMR ; STATE
WOS研究方向	Chemistry ; Physics
语种	英语
WOS记录号	WOS:000405424100043
资助机构	Major Program of the National Natural Science Foundation of China(21334005 ; Major Program of the National Natural Science Foundation of China(21334005 ; Major International (Regional) Joint Research Project(21620102004) ; Major International (Regional) Joint Research Project(21620102004) ; National Natural Science Foundation of China(51573143 ; National Natural Science Foundation of China(51573143 ; 21120102038) ; 21120102038) ; 21505153) ; 21505153) ; Major Program of the National Natural Science Foundation of China(21334005 ; Major Program of the National Natural Science Foundation of China(21334005 ; Major International (Regional) Joint Research Project(21620102004) ; Major International (Regional) Joint Research Project(21620102004) ; National Natural Science Foundation of China(51573143 ; National Natural Science Foundation of China(51573143 ; 21120102038) ; 21120102038) ; 21505153) ; 21505153)
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/11455]
专题	武汉物理与数学研究所_磁共振基础研究部
作者单位	1.Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China 2.Chinese Acad Sci, Wuhan Inst Phys & Math, Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Wang, Sen,Sun, Peng,Liu, Maili,et al. Weak interactions and their impact on cellulose dissolution in an alkali/urea aqueous system[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2017,19(27):17909-17917.
APA	Wang, Sen,Sun, Peng,Liu, Maili,Lu, Ang,&Zhang, Lina.(2017).Weak interactions and their impact on cellulose dissolution in an alkali/urea aqueous system.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,19(27),17909-17917.
MLA	Wang, Sen,et al."Weak interactions and their impact on cellulose dissolution in an alkali/urea aqueous system".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 19.27(2017):17909-17917.