丙三醇改性对电流变液性能的影响

Effect of glycerol on electrorheological properties of gly-O-Ti suspensions

以丙三醇和钛酸四丁酯为原料,采用沉淀法制备丙三醇改性氧钛系(gly-O-Ti)电流变液颗粒,通过实验研究丙三醇加入量对颗粒形态及电流变性能的影响。颗粒结构及形态测试结果表明,gly-O-Ti颗粒呈无定形态,其粒径随丙三醇量增加而增大。电流变性能采用MCR301旋转流变仪测得,结果表明,当丙三醇与钛酸四丁酯摩尔比为2.5时,所制备的gly-O-Ti颗粒具有最佳的电流变效应;以此颗粒为分散相制备颗粒质量浓度为70%的电流变液,其在2.5kV/mm的电场强度下,剪切屈服强度达150kPa,呈低场高强特性。

Glycerol modified titanium oxide （gly-O-Ti） particles were prepared with glycerol and tetrabutyltitan ate （TBOT） by using a precipitation method. The effect of the glycerol on morphology and electrorheological properties of the gly-O-Ti particles was studied experimentally. The X-ray diffraction （XRD） results indicated that the gly-O-Ti particles were amorphous. The microstructure of the particles were observed by scanning electron microscope （SEM）, which indicated that the particle size increases with increasing content of the glyc- erol in reactant. MCR301 rheometer was used to test the electorheological properties of the electorheological fluids （ERFs） prepared with different gly-O-Ti particles. The results indicated that the ER fluid prepared with the particles in a mol ratio （n（gly）/n（TBOT）） of 2.5 presented the best ER performance. Therefore, ER fluid with 70wt% particles in the optimal tool ratio was prepared. Its yield strength reached 150kPa at 2.5kV/mm, indicated that the glycerol modified titanium oxide could be used to prepare ER fluids with large yield strength at low electric field levels.