Preparation and aging effects in PEO-based nanocomposites

在这个项目中，我们建议调查的形成和制备和老化依赖的性能的吸附和可能接枝的聚合物界面在强烈的相互作用的情况下，聚氧化乙烯（PEO）在球形二氧化硅纳米粒子在散装和水悬浮液。在界面的PEO，形成一个吸附（Guiselin）刷，最终决定了粒子之间的相互作用，并与其他成分的研究系统。我们将使用各种固态NMR和互补技术的组合，突出的小角散射和流变学，研究吸附的PEO的动态性能之间的关系，二氧化硅颗粒的排列，和复合材料的机械性能，分别。该项目旨在进一步阐明末端官能化PEO与单分散二氧化硅球的混合物形成胶体FCC超晶格的条件，这是在初步实验中观察到的一种新现象。

In this project, we propose to investigate the formation and the preparation- and aging-dependent properties of adsorbed and possibly grafted polymeric interphases in the strongly interacting case of polyethyleneoxide (PEO) on spherical silica nanoparticles in bulk and aqueous suspension. The PEO in the interphase, forming an adsorption (Guiselin) brush, ultimately determines the interactions of the particles among each other and with other components of the studied system. We will use a combination of various solid-state NMR and complementary techniques, prominently small-angle scattering and rheology, to study the relation between the dynamic properties of the absorbed PEO, the arrangement of the silica particles, and the mechanical properties of the composites, respectively. The project seeks to further elucidate the conditions under which mixtures of end-functionalized PEO with monodisperse silica spheres form colloidal FCC superlattices, a novel phenomenon observed in preliminary experiments.