不同维度SiO2@PMMA核壳纳米颗粒改性环氧树脂的结构与热/力学性能研究

环氧树脂/SiO2纳米复合材料因其优异的粘结性和热/力学等性能而被广泛应用于机械制造、航空航天和建筑装饰等领域。在该纳米复合材料的制备中，利用核壳结构SiO2纳米颗粒可以改善纳米SiO2在基体中的单独分散和增加SiO2与树脂基体之间的界面相容性，从而使复合材料的热/力学等性能得到一定提升。目前的报道主要围绕球形的纳米SiO2改性环氧树脂展开，而关于纳米SiO2的维度对复合材料热/力学等性能的影响关系尚未有系统研究。该问题的解决对于深入理解改性聚合物基体用纳米填料的选择有着重要的理论和实验指导意义。基于此，本项目拟从可凝胶化两嵌段共聚物出发，获得零维（球形）、一维（线形）和二维（片形）等三个维度的SiO2@PMMA核壳杂化纳米颗粒，分别作为纳米填料制备环氧树脂/SiO2纳米复合材料，研究不同维度的SiO2@PMMA核-壳结构对环氧树脂复合材料热/力学等性能的影响关系并阐明其作用机理。

Epoxy resin/SiO2 nanocomposites are widely used in mechanical manufacturing, aerospace, architectural decoration and other fields because of their excellent adhesive performance and thermal/mechanical properties. In the preparation of these nanocomposites, SiO2 nanoobjects with core-shell structure can improve the dispersion of nano-SiO2 in the resin matrix and increase the interfacial compatibility between SiO2 and resin matrix, thus improving the thermal/mechanical properties of the composites. The previous reports mainly focused on the spherical nano-SiO2 modified epoxy resin, while the effect of dimension of nano-SiO2 filler on the thermal/mechanical properties of composites has not been systematically studied. The solution of this problem has important theoretical and experimental significance for further understanding the selection of nano-fillers for modification of polymer matrix. Inspired by it, this proposal aims to obtain zero-dimensional (spherical), one-dimensional (cylindrical) and two-dimensional (sheetlike) SiO2@PMMA core-shell hybrid nanoobjects from gelable diblock copolymers, then using them as nanofillers to prepare epoxy resin/SiO2 nanocomposites, respectively. Furthermore, the relationship between core-shell structures in SiO2@PMMA and thermal/mechanical properties of epoxy resin/SiO2 composites will be detailedly investigated, and their mechanism will be clarified.