剪切黏稠液体的制备及其性能

Preparation and properties of shear thickening fluid

剪切黏稠液体(STF)是一种非牛顿流体,采用SiO2作为分散相微粒,极性溶剂聚乙二醇作为分散介质。用流变仪测量了STF分散体系中SiO2固含量为10%、15%、20%、25%、30%、35%、40%和45%的稳态流变性能以及进行了剪切黏稠性能的可逆性分析。结果表明:随着剪切速率的增加,STF分散体系先出现剪切变稀现象,当剪切速率超过某个临界值时,分散体系出现急剧增稠现象;在剪切速率由小到大和由大到小变化时,2条扫描曲线基本重合,表明STF分散体系的剪切增稠效应具有可逆性。

Shear thickening fluid （STF） , which belongs tO a non-Newtonian liquid, was prepared with silicon dioxide as dispersed phase and polyethylene glycol（PEG） as dispersed medium. The steady-state rheological property of STF with the solid content of silicon dioxide of 10%, 15% ,20% ,25% ,30%, 35% ,40% and 45% was tested by a rheometer, respectively, and the irreversible property of shear viscosity was analyzed. It was found that with the increase of the shear rate, the viscosity of STF reduces first, but when the shear rate exceeds a certain critical point, STF exhibits fast thickening; and the two scanned curves of STF with the shear rate going from low to high and, high to low are basically overlapped, indicating that STF has the reversibility of shear thickening effect.