剪切场下两亲性棒状粒子对聚异丁烯/聚二甲基硅氧烷共混物相形态的影响

摘要

Silica rods with amphiphilic surface properties were synthesized and their effects on the morphology of immiscible polyisobutylene(PIB)/polydimethylsiloxane(PDMS) blends were investigated via online flow-{visualization} technique and rheology.Confocal laser scanning microscopy revealed that amphiphilic silica rods tended to distribute at the interface and within the PIB phase.In addition, the flow-induced coalescence {behavior} of droplets was found to strongly depend on the particle content and the blending composition ratio.The addition of a small amount of amphiphilic silica rods could promote the coalescence of droplets, while {coalescence} was suppressed effectively at high particle loadings.%合成了具有两亲表面性质的棒状SiO2粒子, 借助共聚焦激光扫描显微镜研究了两亲性棒状SiO2粒子在共混物中的选择性分布, 并通过在线剪切-显微技术和流变技术研究了其对聚异丁烯/聚二甲基硅氧烷(PIB/PDMS)不相容共混物形态结构的影响.研究表明, 两亲性棒状SiO2粒子倾向于分布在两相界面处及PIB相中.分散相的剪切诱导凝聚行为强烈依赖于粒子的含量和共混物的组成比.少量两亲性SiO2粒子会促进分散相的凝聚, 而加入足够量的粒子则能抑制分散相凝聚.