流场下纳米粒子的分布对不相容共混物形态结构的影响

Effects of Nanoparticle Dispersion on the Morphology Evolution of Immiscible Blends in Flow

探讨了剪切流场下二氧化硅(SiO2)纳米粒子表面性质(亲水或疏水)及复配对聚异丁烯(PIB)/聚二甲基硅氧烷(PDMS)不相容共混物形态演变的影响。结果表明,加入单一表面性质(亲水或疏水)的粒子均能有效抑制分散相的凝聚,亲水粒子的尺寸细化效应与其分布有关,而疏水粒子与其分布无关。对于混杂粒子填充的PIB/PDMS共混体系,不同配比的混杂粒子均能阻碍分散相的凝聚。但是,当其中的疏水粒子分布在界面处且处于基体相中时比分布在分散相且处于界面能更有效地阻碍分散相的凝聚。

Effects of silica nanoparticles （SiO2） with different surface properties and their hybrid nanoparticles on the morphology evolution of polyisobutylene （PIB）/polydimethylsiloxane （PDMS） immiscible were are investigated. It shows that the coalescence of dispersed phases can be effectively inhibited by separately adding hydrophilic and hydrophobic nanoparticles. Moreover, adding different ratios of hydrophilic and hydrophobic nanoparticles induces different refinement effects on the droplets of PIB/PDMS 20/80 and 80/20 blends. It is ascribed to the different selective distribution of nanoparticles with different surface properties for PIB/PDMS 20/80 and 80/20 blends. It is suggested that the coalescence of dispersed phases is inhibited by hydrophobic nanoparticles which are dispersed at the interface but located in the matrix phase more effectively than which are dispersed at the interface but located in the dispersed phase.