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题名: Rheological Behaviors of Sodium Polystyrene Sulfonate in 1-Allyl-3-methylimidazolium Chloride
作者: Liu, Fu-yong1, 2; Zhang, Bao-qing2; Zhang, Jun2; Liu, Chen-yang2
关键词: Polyelectrolyte ; Ionic Liquids (ILs) ; Electrostatic interaction ; Rheological behaviors
刊名: ACTA POLYMERICA SINICA
发表日期: 2016-09-20
期: 9, 页:1263-1272
收录类别: SCI
英文摘要: Effect of electrostatic interactions between these ions and the charged monomer of polyelectrolyte on the chain conformation and the rheological behavior is a fundamentally important issue for engineering application of polyelectrolyte/ILs systems. Rheological behavior of a polyelectrolyte, sodium polystyrene sulfonate (NaPSS), in 1-allyl-3-methylimidazolium chloride (AmimCl) has been investigated and compared to that in AmimCl/H2O co-solvent solutions. Mole of chain segment unit per liter (mol/L) is used to define the concentration of NaPSS. The results show that, NaPSS in AmimCl solution shows different rheological behaviors from which in salt-free aqueous solution, added salt aqueous solution and neutral polymer in ionic liquid solution. Rheological behaviors of NaPSS in AmimCl/H2O co-solvent solutions are also different from each other. With increasing AmimCl concentration, intrinsic viscosity [eta] of NaPSS in AmimCl/H2O decreases, indicating the decline of chain coil size of NaPSS. NaPSS in AmimCl/H2O co-solvent show the rheological behaviors changing from salt-free polyelectrolyte solution to neutral polymer in theta solvent with increasing AmimCl concentration. When the solvent changes into pure AmimCl, NaPSS in AmimCl solution is divided into two concentration regimes in the range from 0.007 mol/L to 0.8 mol/L. Dynamic frequency sweep shows that NaPSS chain does not overlap in the concentration regime bellow 0.29 mol/L, where the power laws for the concentration dependence of specific viscosity and terminal relaxation time are eta(sp) similar to c(p)(1.4) and tau similar to c(p)(0), respectively, similar to theoretical prediction for salt-free polyelectrolyte solutions in entangled regime. The concentration regime above 0.29 mol/L is considered as semidilute un-entangled regime, where the power laws for the concentration dependence of specific viscosity and terminal relaxation time are eta(sp) similar to c(p)(3.5) and tau similar to c(p)(1.9), respectively, closing to theoretical prediction for neutral polymer in good solvents in entangled regime. The unique phenomenon may be caused by the high electrostatic coupling of monomer-ion and monomer-monomer.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35654
Appears in Collections:工程塑料实验室_期刊论文

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作者单位: 1.Shanxi Univ, Inst Environm Sci, Taiyuan 030006, Peoples R China
2.Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
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