title: Rheological behaviors of cellulose in 1-ethyl-3-methylimidazolium chloride/dimethylsulfoxide.
abstract: Dynamic rheological behaviors of α-cellulose 1-ethyl-3-methylimidazolium chloride ([Emim]Cl)/dimethylsulfoxide (DMSO) solutions were investigated in a large range of cellulose concentrations (0.1-10 wt%) at 25°C. The overlap concentration c* and the entanglement concentration ce for cellulose in [Emim]Cl/DMSO were determined to be 0.5 wt% and 2.0 wt% respectively, and the exponents of the specific viscosity ηsp versus cellulose concentration c were determined as 1.1, 2.1 and 4.7 for dilute, semidilute unentangled and entangled regimes respectively, which were in accordance with the scaling prediction for neutral polymer in θ solvent. Under the same cellulose concentration, the complex viscosity η*, the reptation time τrep and the relaxation time of a segment between entanglements τe all decreased with increasing DMSO content in the solvent, while the number of entanglements of cellulose chains and the molar mass of an entanglement strand Me both remained unchanged.
authors.affiliation: College of Textile, Tianjin Polytechnic University, Tianjin 300387, PR China.
authors.forename: Lejun
authors.initials: L
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin 300387, PR China.
authors.forename: Lei
authors.initials: L
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin 300387, PR China. Electronic address: bowen15@tjpu.edu.cn.
authors.forename: Bowen
authors.initials: B
authors.lastname: Cheng
authors.affiliation: College of Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, PR China; State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin 300387, PR China.
authors.forename: Xiujie
authors.initials: X
authors.lastname: Ji
authors.affiliation: College of Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, PR China; State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin 300387, PR China.
authors.forename: Jun
authors.initials: J
authors.lastname: Song
authors.affiliation: Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory of Molecular Sciences, Institute of Chemistry, Beijing 100190, PR China. Electronic address: lufei2111217@aliyun.com.
authors.forename: Fei
authors.initials: F
authors.lastname: Lu
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D004121:Dimethyl Sulfoxide / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D012212:Rheology; D014783:Viscosity
chemical_list: D007093:Imidazoles; D052578:Ionic Liquids; D002482:Cellulose; C518739:1-ethyl-3-methylimidazolium; D004121:Dimethyl Sulfoxide
keywords: Cellulose; Entanglement; Ionic liquid/DMSO; Rheology; Scaling predictions