聚硅氧烷侧链高分子液晶电流变液体的性能研究

研究聚硅氧烷侧链高分子液晶配制成电流变液体的电流变效应 ,以获得高性能的电流变液体 ,应用德国RV2 0电流变仪测试性能。结果表明 ,该电流变液体 5 2℃ ,电场强度由零增至DC 2 0 0 0V/mm ,剪切速率为 30 0s-1时 ,剪切应力由 2 0 0Pa增至 5 4 0 0Pa ,表观黏度由 2 0 0mPa·s增至 10 0 0 0mPa·s;剪切速率为 4 0 0s-1时 ,剪切应力由 2 0 0Pa增至 6 30 0Pa,表观黏度由 2 0 0 0mPa·s增至 76 0 0mPa·s ;剪切速率为 5 0 0s-1时 ,剪切应力由 2 75Pa增至 6 80 0Pa,表观黏度由5 0 0mPa·s增至 90 0 0mPa·s。 77℃时 ,同样条件下 ,剪切速率为 5 0 0s-1时 ,剪切应力达 80 0 0Pa,具有更高的剪切应力 ,说明温度适应性较强。

Study of Electrorheological Properties of Side-chain Polysiloxane Liquid Crystal

The electrorheological(ER) effect of ER fluid using side chain polysiloxane liquid crystal as dispersed phase was studied. The rheological properties were investigated with Germanic RV20 rheometer. At 52 ℃,as the electric field strength increased from 0 to DC2000 V/mm,the shear stress increased from 200 Pa to 5400 Pa and the viscosity increased from 2000 mPa·s to 10000 mPa·s at shear rate of 300 s -1 ;the shear stress increased from 200 Pa to 6300 Pa and the viscosity increased from 200 mPa·s to 7600 mPa·s at shear rate of 400 s -1 ;the shear stress increased from 275 Pa to 6800 Pa and the viscosity increased from 500 mPa·s to 9000 mPa·s at shear rate of 500 s -1 .At 77 ℃and shear rate of 500s -1 ,the shear stress reached 8000Pa,indicating that the fluid can be used in wide temperature range.