标题： 界面二氧化硅纳米颗粒稳定双连续聚合物共混物 显示英文标题

标题： Interfacial silica nanoparticles stabilize cocontinuous polymer blends

摘要： 我们研究了聚合物混合物中连续结构的形成。 这些聚合物双连续胶体（bicontinuous interfacially jammed emulsion gels）由聚苯乙烯低聚物、聚丁烯和荧光疏水二氧化硅纳米颗粒组成。 微米级的连续形态通过界面处的单层二氧化硅纳米颗粒得到稳定。 首次通过激光扫描共聚焦显微镜实现了对由界面粒子稳定的连续聚合物混合物融合动力学的实时观察。 我们证明，融合的抑制是由于纳米颗粒覆盖了界面。 此外，通过将共聚焦显微镜与流变学结合，我们将连续结构的流变响应与其形态变化相关联。 我们发现，流变行为可以归因于界面收缩与粒子网络形成的竞争。 此外，我们还表明，在高于旋节点的温度下两种聚合物相重新混合后，粒子骨架仍然保持。 最后，我们还讨论了粒子稳定的连续结构与普通胶体凝胶的剪切响应之间的差异：在剪切作用下，前者比后者更脆弱。 显示英文摘要

摘要： We investigated the formation of cocontinuous structures in polymer blends. These polymeric bijels (bicontinuous interfacially jammed emulsion gels) were composed of polystyrene oligomer, polybutene and fluorescent hydrophobic silica nanoparticles. A micron-sized cocontinuous morphology was stabilized by a monolayer of silica nanoparticles at the interface. Real-time observation of coalescence dynamics in co-continuous polymer blends stabilized by interfacial particles was for the first time achieved via laser scanning confocal microscopy. We demonstrated that suppression of coalescence arises from coverage of interfaces by nanoparticles. Furthermore, by combining confocal microscopy with rheology, we correlated the rheological response of a cocontinuous structure with its morphology change. We found that the rheological behavior can be attributed to competition between interface shrinkage and particle network formation. In addition, we showed that a particle scaffold is maintained even after the remixing of two polymer phases above the spinodal point. Finally, we also discussed differences between the shear response of the particle-stabilized cocontinuous structure and normal colloidal gels: the former one is more fragile than the latter under shear.