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化学学报
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化学学报 ›› 2003, Vol. 61 ›› Issue (1): 129-132. 上一篇    下一篇

研究论文

低剪切速率下聚乙二醇／KCl／蒙脱土分散体系的剪切稠化现象

莫小刚;张春光;刘尚营;孙德军;韩书华   

  1. 山东大学,济南(250100)
  • 发布日期:2003-01-15

Effect on Shear Thickening of Polyglycol/KCL/Montmorillonite Dispersion at Low Shear Rates

Mo Xiaogang;Zhang Chunguang;Liu Shangying;Sun Dejun;Han Shuhua   

  1. Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University,Jinan 250100
  • Published:2003-01-15

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用Hakke RS75流变仪研究了聚乙二醇（PEG）／KCl/蒙脱土分散体系的流变性 。结果发现，当KCl和聚乙二醇浓度在一定范围内时，体系随剪切速率增加，表现 出剪切稀释－剪切稠化－剪切稀释的复杂结构变化，并且剪切稠化发生在低剪切速 率区。KCl浓度继续增加，剪切稠化逐渐减弱。TME表明，蒙脱土分散体系中加入 KCl使得蒙脱土颗粒聚集，而聚乙二醇导致经微絮凝；二者同时加入，体系形成细 枝条状的空间稳定结构。

关键词: 剪切速率, 聚乙二醇, 分散体系(化学), 稠化剂, 流变, 现象, 氯化钾, 透射电子显微术

The viscosity of dispersion of polyglycol/KCl/montmorillonite as shear rate increases is studied by RS75 Haake rheometer. It turns out that the dispersion shows a complex transition process of shear- thinning → shear-thickening → shear-thinning as the increase of shear rate when polyglycol and KCl are present together in a certain range of concentrations, shear thickening weakens gradually. The photographs of TEM indicate that KCl causes montmorillonite to aggregate together and polyglycol solely leads to slight flocculation in montmorillonite dispersion. When both of them are present, the dispersion forms sterically stable state of strip structure.

Key words: SHEAR RATE, POLYGLYCOL, DISPERSE SYSTEM, THICKENERS, RHEOLOGY, PHENOMENA, POTASSIUM CHLORIDE, TRANSMISSION ELECTRON MICROSCOPY

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