不同电解质对海藻酸钠水溶液流变性能的影响  

Effect of Electrolyte on the Rheological Behaviors of Sodium Alginate Solutions

作　　者：张杨[1] 梁洪超[1] 刘海祥[1] 马营营[1] 秦雪[1] 隋坤艳[1] 夏延致[1] 

机构地区：[1]青岛大学纤维新材料与现代纺织国家重点实验室培育基地,青岛266071

出　　处：《青岛大学学报（自然科学版）》2013年第2期57-61,共5页Journal of Qingdao University(Natural Science Edition)

基　　金：国家"863"重点计划(批准号:2010AA093701);国家自然科学基金(批准号:50973047);青岛市自然基金(批准号:10-3-43-3-jch)项目资助

摘　　要：利用旋转流变仪研究氯化钠(NaCl),氯化钾(KCl)和碳酸钠(Na2CO3)3种电解质对海藻酸钠溶液流变行为的影响。研究结果表明:溶液中电解质浓度为0～0.5mol/L时的粘弹性能变化不大。随着电解质浓度的增加3种电解质对海藻酸钠溶液的流变性能影响不同:NaCl和KCl对溶液的流变性能影响比Na2CO3要明显,NaCl对海藻酸钠溶液流变性能影响的响应最快,当溶液中NaCl摩尔浓度在0.9mol/L以下时,随着NaCl浓度的增加溶液的粘度和模量增大,当NaCl浓度为1.1mol/L时溶液的粘度迅速减小。在实验的浓度范围内随着KCl浓度的增加溶液的粘度和模量不断增加且最终形成的凝胶强度最大。Na2CO3对体系流变性能影响较弱,不能形成凝胶。The effect of three kinds of electrolytes （NaCl, KCl and Na2CO3 ） with different valent of anion and cation on the rheological behaviors of sodium alginate（SA） solutions is investigated . Results show that the viscoelastic properties of SA solutions remain stable in the presence of electrolytes with a low concentration at the range of 0-0.5 mol/L. With the increase of the electrolytes concentration, however, the electrolytes show a remarkable influence on rheological behaviors. It is found that NaCl and KCI play a greater role in the viscoelastic behaviors of SA solutions than Na2 CO3. The effects of NaCl on the rheological properties of SA are more pronounced. When the content of NaCl is below 0.9 mol/L, viscosity and modulus of the solution increase with the increasing of NaCl concentration. But it is noted that with the NaCl content reached up to 1.1 mol/L, viscosity and modulus of the solution reduce rapidly. Whereas, the viscosity and modulus of the solution increases with adding KCl into the SA solutions and the gel will be formed with highest strength by adding KCI in this work. The effects of Na2CO3 system are weak and the gel cannot formed.

关 键 词：海藻酸钠 电解质 流变性能 粘弹性能 

分 类 号：TQ314.1[化学工程—高聚物工业]