Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (05): 565-569. Previous Articles     Next Articles

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镁铝类水滑石/阳离子淀粉分散体系流变学振荡行为研究

李燕*,1,毕浩宇2,申双龙1   

  1. (1长治学院化学系 长治 046011)
    (2长治医学院生物医学工程系 长治 046000)
  • 投稿日期:2010-07-18 修回日期:2010-10-31 发布日期:2010-11-01
  • 通讯作者: 李燕 E-mail:liyan_china@126.com
  • 基金资助:

    国家自然科学基金项目;国家自然科学基金;山西省高校科技开发资助项目

Rheological Fluctuation Behavior of Suspensions Containing Aluminum Magnesium Hydrotalcite-like Compound and Cationic Starch

Li Yan*,1 Bi Haoyu2 Shen Shuanglong1   

  1. (1 Department of Chemistry, Changzhi College, Changzhi 046011)
    (2 Department of Biomedicine Engineering, Changzhi Medical College, Changzhi 046000)
  • Received:2010-07-18 Revised:2010-10-31 Published:2010-11-01
  • Contact: Yan Li E-mail:liyan_china@126.com

The rheological properties of aqueous suspensions containing cationic starch (CS) and positively charged aluminum magnesium hydrotalcite-like compound (Mg-Al HTlc) were investigated by steady shear and oscillatory shear experiments. In the range of pH tested, all of the suspensions exhibit shear-thinning behavior. The rheological fluctuation behavior was discovered in the suspensions, i.e., the apparent viscosity of the suspensions oscillated with time at a constant low shear rate after pre-shearing. The fluctuation mechanism is proposed in terms of the periodic transformation of CS molecular (chain) conformation. Because pH, interaction between HTlc and CS molecule and shear rate can affect the energy and frequency of transformation of CS molecular conformation, the oscillation amplitude and period can change with pH, HTlc content and shear rate.

Key words: aluminum magnesium hydrotalcite-like compound, cationic starch, suspensions, rheology, fluctuation

CLC Number: