物理化学学报 >> 2009, Vol. 25 >> Issue (04): 752-756.doi: 10.3866/PKU.WHXB200904171

研究论文 上一篇    下一篇

表面活性剂对海藻酸钠稀水溶液剪切粘度的影响

杨继生 陈生碧 方云   

  1. 江南大学化学与材料工程学院, 江苏 无锡 214122; 扬州大学化学化工学院, 江苏 扬州 225002
  • 收稿日期:2008-10-08 修回日期:2008-12-15 发布日期:2009-03-31
  • 通讯作者: 杨继生; 方云 E-mail:yzyjs_cn@126.com;yunfang@126.com

Effect of Surfactants on the Shear Viscosity of Dilute Aqueous Solutions of Sodium Alginate

 YANG Ji-Sheng, CHEN Sheng-Bi, FANG Yun   

  1. School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, Jiangsu Province, P. R. China; School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu Province, P. R. China
  • Received:2008-10-08 Revised:2008-12-15 Published:2009-03-31
  • Contact: YANG Ji-Sheng; FANG Yun E-mail:yzyjs_cn@126.com;yunfang@126.com

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摘要： 通过粘度法考察了不同pH值时, 阴离子聚电解质海藻酸钠(NaAlg)与阴离子表面活性剂十二烷基硫酸钠(SDS)、阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)、非离子表面活性剂辛基酚聚氧乙烯醚(TritonX-100)以及它们的复配体系的相互作用. 研究表明, 在酸性条件下, SDS和TritonX-100与NaAlg之间主要是疏水作用, 随着表面活性剂浓度的增加, 体系粘度下降直到基本不变, CTAB与NaAlg主要发生静电作用和疏水作用, 体系粘度随CTAB浓度的增加呈现先上升后下降的趋势. 在实验条件下, TritonX-100浓度为0.05 mmol·L-1时, SDS的加入, 使得NaAlg/TritonX-100体系的零剪切粘度下降, 而CTAB的加入, 在pH=3.0和5.0时, NaAlg/TritonX-100体系的零剪切粘度出现上升, 在pH=6.4时, 该体系零剪切粘度下降.

关键词: 海藻酸钠, 表面活性剂, 聚合物-表面活性剂作用, 剪切粘度

Abstract: Interactions between the anionic polyelectrolyte sodium alginate (NaAlg) and the anionic surfactant sodium dodecyl sulfate (SDS), the cationic surfactant cetyltrimethylammoniumbromide (CTAB), non-ionic surfactants octylphenol polyethoxylates (TritonX-100) as well as their compounded system were investigated by viscosity measurement techniques at different pH values in dilute solution. A hydrophobic interaction was observed in NaAlg/SDS and NaAlg/TritonX-100 aqueous solutions. By increasing the surfactant concentration the zero-shear viscosity initially decreased and then remained almost unchanged. However, the strong association between NaAlg and CTAB was affected by an electrostatic attraction and also a hydrophobic interaction. In acidic solution, the zero-shear viscosity initially increased and then decreased as the CTAB concentration increased. At a TritonX-100 concentration of 0.05 mmol·L-1, the zero-shear viscosity decreased upon addition of SDS for the NaAlg/TritonX-100 system under laboratory conditions. Upon addition of CTAB, the zero shear viscosity of NaAlg/TritonX-100 system increased at pH 3.0 and 5.0 but decreased at pH 6.4.

Key words: Sodium alginate, Surfactant, Polymer-surfactant interaction, Shear viscosity

MSC2000: 

  • O648