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Chen Y, Nishiyama Y, Lu A, Fang Y, Shao Z, Hu T, Ye D, Qi H, Li X, Wohlert J, Chen P. The thermodynamics of enhanced dope stability of cellulose solution in NaOH solution by urea. Carbohydr Polym 2023; 311:120744. [PMID: 37028854 DOI: 10.1016/j.carbpol.2023.120744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 01/10/2023] [Accepted: 02/22/2023] [Indexed: 03/07/2023]
Abstract
The addition of urea in pre-cooled alkali aqueous solution is known to improve the dope stability of cellulose solution. However, its thermodynamic mechanism at a molecular level is not fully understood yet. By using molecular dynamics simulation of an aqueous NaOH/urea/cellulose system using an empirical force field, we found that urea was concentrated in the first solvation shell of the cellulose chain stabilized mainly by dispersion interaction. When adding a glucan chain into the solution, the total solvent entropy reduction is smaller if urea is present. Each urea molecule expelled an average of 2.3 water molecules away from the cellulose surface, releasing water entropy that over-compensates the entropy loss of urea and thus maximizing the total entropy. Scaling the Lennard-Jones parameter and atomistic partial charge of urea revealed that direct urea/cellulose interaction was also driven by dispersion energy. The mixing of urea solution and cellulose solution in the presence or absence of NaOH are both exothermic even after correcting for the contribution from dilution.
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Affiliation(s)
- Yu Chen
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and Engineering, Beijing Institute of Technology, 100081 Beijing, PR China
| | | | - Ang Lu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Yan Fang
- Fujian Key Laboratory of Polymer Materials, College of Chemistry and Materials Science, Fujian Normal University, Fujian 350007, PR China
| | - Ziqiang Shao
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and Engineering, Beijing Institute of Technology, 100081 Beijing, PR China
| | - Tao Hu
- School of Materials Science and Engineering, State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200444, China
| | - Dongdong Ye
- School of Textile Materials and Engineering, Wuyi University, Jiangmen 529020, PR China
| | - Haisong Qi
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, PR China
| | - Xiaodong Li
- School of Materials Science and Engineering, Beijing Institute of Technology, 100081 Beijing, PR China
| | - Jakob Wohlert
- Wallenberg Wood Science Center, Department of Fiber and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56-58, SE-10044 Stockholm, Sweden.
| | - Pan Chen
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and Engineering, Beijing Institute of Technology, 100081 Beijing, PR China.
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Wang W, Li F, Yu J, Navard P, Budtova T. Influence of substitution on the rheological properties and gelation of hydroxyethyl cellulose solution in NaOH-water solvent. Carbohydr Polym 2015; 124:85-9. [PMID: 25839797 DOI: 10.1016/j.carbpol.2015.01.065] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2014] [Revised: 01/24/2015] [Accepted: 01/28/2015] [Indexed: 10/24/2022]
Abstract
The rheological properties of hydroxyethyl cellulose (HEC) with a low molar substitution (MS) dissolved in 8wt% NaOH-water were studied as a function of solution temperature, polymer concentration and molar substitution. Special attention was paid to gelation kinetics. Similar to cellulose dissolved in alkali or ionic liquids, the intrinsic viscosity of HEC decreased with temperature increase, indicating a decrease of solvent thermodynamic quality. The gelation time of HEC solutions decreased exponentially with temperature but the kinetics is much slower than the gelation of microcrystalline cellulose solutions in the same solvent. Higher molar substitution leads to slower gelation. The small amount of introduced hydroxyethyl groups prevented cellulose aggregation thus increasing solution stability.
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Affiliation(s)
- Wencong Wang
- College of Textiles, Donghua University, Shanghai 201620, China; MINES ParisTech, PSL Research University, CEMEF - Centre de Mise en Forme des matériaux, CNRS UMR 7635, CS 10207 rue Claude Daunesse, 06904 Sophia Antipolis Cedex, France
| | - Faxue Li
- College of Textiles, Donghua University, Shanghai 201620, China
| | - Jianyong Yu
- Modern Textile Institute, Donghua University, Shanghai 200051, China
| | - Patrick Navard
- MINES ParisTech, PSL Research University, CEMEF - Centre de Mise en Forme des matériaux, CNRS UMR 7635, CS 10207 rue Claude Daunesse, 06904 Sophia Antipolis Cedex, France.
| | - Tatiana Budtova
- MINES ParisTech, PSL Research University, CEMEF - Centre de Mise en Forme des matériaux, CNRS UMR 7635, CS 10207 rue Claude Daunesse, 06904 Sophia Antipolis Cedex, France.
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Internal surface polarity of regenerated cellulose gel depends on the species used as coagulant. J Colloid Interface Sci 2011; 359:194-201. [DOI: 10.1016/j.jcis.2011.03.038] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Revised: 03/09/2011] [Accepted: 03/11/2011] [Indexed: 11/17/2022]
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MIYAMOTO H, YAMANE C, SEGUCHI M, OKAJIMA K. Structure and Properties of Cellulose-Starch Blend Films Regenerated from Aqueous Sodium Hydroxide Solution. FOOD SCIENCE AND TECHNOLOGY RESEARCH 2009. [DOI: 10.3136/fstr.15.403] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Yang G, Miyamoto H, Yamane C, Okajima K. Structure of Regenerated Cellulose Films from Cellulose/Aqueous NaOH Solution as a Function of Coagulation Conditions. Polym J 2006. [DOI: 10.1295/polymj.pj2006025] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Zhang L, Mao Y, Zhou J, Cai J. Effects of Coagulation Conditions on the Properties of Regenerated Cellulose Films Prepared in NaOH/Urea Aqueous Solution. Ind Eng Chem Res 2005. [DOI: 10.1021/ie0491802] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lina Zhang
- Department of Chemistry, Wuhan University, Wuhan 430072, People's Republic of China
| | - Yuan Mao
- Department of Chemistry, Wuhan University, Wuhan 430072, People's Republic of China
| | - Jinping Zhou
- Department of Chemistry, Wuhan University, Wuhan 430072, People's Republic of China
| | - Jie Cai
- Department of Chemistry, Wuhan University, Wuhan 430072, People's Republic of China
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Zhang L, Ruan D, Gao S. Dissolution and regeneration of cellulose in NaOH/thiourea aqueous solution. ACTA ACUST UNITED AC 2002. [DOI: 10.1002/polb.10215] [Citation(s) in RCA: 240] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Yang G, Zhang L, Han H, Zhou J. Cellulose/casein blend membranes from NaOH/urea solution. J Appl Polym Sci 2001. [DOI: 10.1002/app.1781] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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