Influence of temperature on the solution rheology of cellulose in 1-ethyl-3-methylimidazolium chloride/dimethyl sulfoxide
Influence of temperature on the solution rheology of cellulose in 1-ethyl-3-methylimidazolium chloride/dimethyl sulfoxide
复制标题
温度对纤维素在1-乙基-3-甲基咪唑氯化物/二甲亚砜中溶液流变性的影响
DOI：
10.1007/s10570-015-0740-x
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发表时间：
2015-10-01
期刊：
影响因子：
5.7
通讯作者：
Huang, Yong
中科院分区：
文献类型：
--
作者：
Lu, Fei;Wang, Lejun;Huang, Yong
研究了各种浓度和温度下纤维素溶液在 1-乙基-3-甲基咪唑氯化物/二甲亚砜（[Emim]Cl/DMSO，7/3，w/w）中的流变特性。纤维素/[Emim]Cl/DMSO 溶液的粘度与复数粘度非常吻合，表明 Cox-Merz 定律对该溶液有效。在 25–100 °C 的温度下，半稀非缠结和半稀缠结状态下，纤维素 (η0–ηs) 和纤维素浓度 (c) 贡献的粘度分别为 (η0–ηs)~cn，范围为 2.00–1.57 和 4.52–3.79。溶液的特性粘度在低于 60 °C 的温度下保持恒定，并随着温度高于 60 °C 的升高而线性下降。纤维素/[Emim]Cl/DMSO溶液的活化能随着纤维素浓度的增加而增加。 [Emim]Cl/DMSO 中纤维素的链动力学在稀释状态（低于 0.5 wt%）和半稀释非缠结状态（0.5 至 2 wt%）下分别遵循 Zimm 模型和 Rouse 模型。
Rheological properties of cellulose solutions in 1-ethyl-3-methylimidazolium chloride/dimethyl sulfoxide ([Emim]Cl/DMSO, 7/3, w/w) in a wide range of concentration and temperature were investigated. The viscosity of cellulose/[Emim]Cl/DMSO solution agrees well with the complex viscosity suggesting Cox–Merz law is valid for the solution. The viscosity contributed by cellulose (η0–ηs) and cellulose concentration (c) scales as (η0–ηs)~cnwithnin the range of 2.00–1.57 and 4.52–3.79 in semidilute unentangled and semidilute entangled regimes, respectively, in the temperature of 25–100 °C. Intrinsic viscosity of the solutions remains constant at temperature below 60 °C and decreases linearly with the increase of temperature above 60 °C. The activation energy of cellulose/[Emim]Cl/DMSO solution increases with the increase in cellulose concentration. The chain dynamics of cellulose in [Emim]Cl/DMSO follows Zimm model and Rouse model in dilute regime (lower than 0.5 wt%) and semidilute unentangled regime (between 0.5 and 2 wt%), respectively.