纳米SiO2/ BMIm BF4剪切增稠液的制备及性能研究

摘要

合成了1-丁基-3-甲基咪唑四氟硼酸盐离子液体([ BMIm ] BF4),考察了浓度、温度、频率对纳米 SiO2/[ BMIm] BF4分散体系流变性能和粘弹性能的影响。结果表明,SiO2/[ BMIm] BF4分散体系表现出剪切增稠特性,且随SiO2固相含量增加、体系温度降低,其剪切增稠效果更加明显；SiO2/[ BMIm] BF4分散体系的损耗模量( G″)始终大于储能模量( G′),为耗散体系,且随SiO2固相含量和角频率的增加、温度的降低,G″、G′增加。相比PEG400作为分散介质,[ BMIm] BF4具有更加突出的剪切增稠特性。%1-Butyl-3-methylimidazolium tetrafluoroborate was synthesised. The effect of concentration, tremperature and frequency on the rheological and viscoelastic properties of dispersions of silica in [ BMIm] BF4 have been studied. The result showed that the system shows reversible shear thickening be-havior. Under steady shear test,as the SiO2 concentration increasing and the temperature decreasing,the shear thickening phenomena are more obvious. Under oscillation shear test,the magnitude of loss modulus G″is larger than that of storage modulus G′, which shows that these suspensions mainly possess viscous property. As the SiO2 concentration,angular frequency increasing and the temperature decreasing,G′and G″increase. [ BMIm] BF4 as dispersion medium has a stronger thickening effect than PEG400 as disper-sion medium.