化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (10) : 170-172.

科学研究

不同粒径剪切增稠液的制备及流变性能研究

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Study on preparation and rheological behavior of shear thickening fluid with different particle diameter

Fan Jianhui¹,Cao Haijian¹,Xu Shanqing¹,Chen Hongxia²,Huang Xiaomei²

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摘要

分别以直径12nm、2μm的SiO₂作为分散相,聚乙二醇-200(PEG-200)作为分散介质,通过机械和超声震荡的方式制备不同体系的剪切增稠液(STF)。采用透射电镜观察纳米SiO₂粒子的外观形貌及团聚情况,采用流变仪测试STF的稳态流变性能。结果表明:直径12nm的SiO₂粒子团聚现象明显,直径2μm的SiO₂粒子没有团聚现象;STF黏度随着剪切速率的增加呈现先变稀、再增稠的现象,表现为非牛顿流体特性;随着纳米SiO₂含量的增加,STF的临界黏度随之增加,而临界剪切速率则随之下降;直径12nm的SiO₂粒子制备的STF体系剪切增稠效果好于2μm。

Abstract

Nano silica particles (nano-SiO₂ particles) with diameter of 12nm and 2μm used as the dispersed phase and PEG-200 used as the dispersion medium,shear thickening fluid (STF) with different system was prepared by mechanical stirring and ultrasonic shock.The morphology and agglomeration of nano-SiO₂ particles were observed by JEM-2100(HR) type transmission electron microscopy,and the steady state and dynamic rheological properties of STF were tested by DHR rheometer.The results showed that the agglomeration of particles with diameter of 12nm was obvious,and that of 2μm was not obvious.The viscosity of STF exhibited firstly thinning and secondly thickening with the increase of shear velocity,which manifested as non-Newtonian fluid properties.The critical viscosity increased and critical shear velocity decreased of STF with increasing the concentration of particle.Shear thickening effect of particles with 12nm was better than that with 2μm.

关键词

纳米SiO₂粒子 / 剪切增稠液 / 聚乙二醇-200 / 临界剪切速率 / 临界黏度

Key words

nano silica particle (nano-SiO₂ particle) / shear thickening fluid (STF) / PEG-200 / critical shear velocity / critical viscosity

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不同粒径剪切增稠液的制备及流变性能研究[J]. 化工新型材料, 2018, 46(10): 170-172 DOI:

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