CMS/TiO2杂化材料电流变液的制备及其性能

利用特殊的溶胶凝胶方法原位制备了改性淀粉与无机钛氧化物杂化型电流变材料。实验表明,在强电场下其电流变效应比相同组份的淀粉、二氧化钛混合型电流变液有显著提高,直流电场4 kV/mm,剪切速率5 s-1时,静态剪切屈服强度可达4000 Pa以上。同时,抗沉降性明显改善,静置100 h几乎不沉淀。此外,温度效应也获得一定的优化,在10 ℃~90 ℃的工作温度范围内力学性能保持良好,70 ℃时剪切强度达到最大值。

PREPARATION OF CMS/TiO2 HYBRID MATERIAL ELECTRORHEOLOGICAL FLUID AND ITS PROPERTIES

A new type of organic-inorganic hybrid material,made of carboxyl methyl starch and titanium dioxide, is synthesized by means of modified in-situ sol-gel technique. IR analysis shows that there is somewhat weak interaction between these two components,whose dispersion is almost up to a molecular level. A series of physical properties of suspension of this hybrid in methyl silicone oil are investigated under direct current field. The mechanic performance of this hybrid ERF is much stronger than that of pure starch, titanium oxide and their blends ERF. For example, the static shear stress is above 4 kPa, shear rate 5 s-1,when 4 kV/mm DC is applied at room temperature. In the meanwhile, the temperature effect is optimized; its maximum stress appears at around 70 ℃, and remains a considerable value at even 90 ℃. In addition, by adjusting the displacement ratio of carboxyl in starch, its suspension stability can be much improved.