聚苯乙烯磺酸钠在1-烯丙基-3-甲基咪唑氯盐中的流变行为

发布时间：2018-04-25 05:42

本文选题：聚电解质 + 离子液体　；参考：《高分子学报》2016年09期

【摘要】：研究了聚苯乙烯磺酸钠(Na PSS)在1-烯丙基-3-甲基咪唑氯盐(AmimCl)中的流变行为,并与其在AmimCl/H_2O混合溶剂中的流变行为进行了对比.聚合物浓度单位为每升溶剂中所含链段单元的摩尔数(mol/L).研究发现,Na PSS在AmimCl中表现出与其在无盐、有盐水溶液以及中性聚合物在离子液体(ILs)溶液中不同的流变行为.Na PSS在AmimCl含量不同的AmimCl/H_2O混合溶剂中的流变行为也不相同,随着AmimCl含量的增加,Na PSS在混合溶剂中的特性黏数[η]逐渐降低,表明分子线团逐渐塌缩,溶液的增比黏度随Na PSS浓度变化的标度所表现出的性质由聚电解质无盐水溶液特点逐渐变为中性聚合物溶液在θ状态下特点.当溶剂为纯AmimCl时,0.007~0.8 mol/L的浓度范围在0.29 mol/L处被分成2个浓度区.动态流变行为研究表明c0.29 mol/L浓度区为稀溶液区,溶液的增比黏度和弛豫时间随Na PSS浓度变化的标度关系为:ηsp~c1.4p和τ~c0p,与无盐聚电解质水溶液在缠结区的行为相似;c0.29 mol/L浓度区为溶液的亚浓非缠结区,溶液在该浓度区内增比黏度和弛豫时间随Na PSS浓度变化的标度关系为:ηsp~c3.5p和τ~c1.9p,接近于中性聚合物良溶液在亚浓缠结区的行为.这一特殊现象可能由混合体系中强烈的长程静电耦合作用引起.
[Abstract]:The rheological behavior of sodium polystyrene sulfonate sodium PSS in 1-allyl-3-methyl imidazolium chloride (AmimCl) was studied and compared with that in AmimCl/H_2O mixed solvent. The unit of polymer concentration is the mole number of the chain unit in each liter of solvent. It was found that the rheological behavior of Na PSS in AmimCl was different from that in salt-free, brine solution and neutral polymer solution. Na PSS showed different rheological behavior in AmimCl/H_2O mixed solvent with different AmimCl content. With the increase of AmimCl content, the intrinsic viscosity [畏] of Na PSS in mixed solvents decreases gradually, indicating that the molecular coils gradually collapse. The properties of the scaling of the increasing viscosity of the solution with the concentration of Na PSS changed from the characteristics of the polyelectrolyte brine free solution to the neutral polymer solution in 胃 state. When the solvent was pure AmimCl, the concentration range of 0. 0070. 8 mol/L was divided into two concentration regions at 0. 29 mol/L. The dynamic rheological behavior shows that the concentration range of C0.29 mol/L is dilute solution. The scaling relationship between the specific viscosity and relaxation time of the solution with the concentration of Na PSS is 畏 sp~c1.4p and 蟿 C 0p. The concentration region of C 0.29 mol/L is the subconcentrated non-entangled region of the solution, which is similar to the behavior of the aqueous solution of non-salt polyelectrolyte in the entangled region. The scaling relationship between the specific viscosity and relaxation time of the solution with Na PSS concentration is 畏 sp~c3.5p and 蟿 C 1.9p, which is close to the behavior of good neutral polymer solution in the subconcentrated entanglement region. This special phenomenon may be caused by the strong long-range electrostatic coupling in the mixed system.
【作者单位】：山西大学环境科学研究所;中国科学院化学研究所;
【基金】：国家自然科学基金(基金号21374127)资助项目山西大学人才建设项目(项目号205533801001)资助
【分类号】：O631.21

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