基于无机纳米粒子/高分子基体/环氧树脂/聚硫醇的自修复材料的制备及力学性能的研究

A series of inorganic nanoparticles with a variety of types, sizes and morphologies will be synthesized systematically, and modified by either surface chemical or physical modification. The nanoparticles will be dispersed into the mixtures of photo-polymerizable monomers/photoinitiator/epoxy and photo-polymerizable monomers/photoinitiator/polymercaptan/tertiary ammonium, separately. Then, these two mixtures will be irradiated by ultraviolet light to induce the crosslinking between the polymeriazable molecules to form micro- phase separation, and thus polymer matrix/epoxy/nanoparticles and polymer matrix/polymercaptan/tertiary ammonium/nanoparticles composites will be obtained individually. If these two composite films is overlapped and some crack occurs within them, the epoxy and the polymercaptan and the tertiary ammonium will fill the crack and incur thermal crosslinking between the molecules of the epoxy and the polymercaptan resulting in self-healing function. The effects of types, sizes, morphologies, contents and surface modification methods of the nanoparticles on the dispersion of the nanoparticles in the composites and on the mechanical properties of the composites as well as the related mechanism will be investigated, to explore a novel preparation method for self-healing system with high mechanical properties.

本课题拟系统的制备一系列不同种类、粒径和形貌的无机纳米粒子，并通过使用表面修饰剂或物理包覆有机化合物的方法对其进行表面修饰，然后将所制备的无机纳米粒子分别分散到含有光聚合单体/光引发剂/环氧树脂和光聚合单体/光引发剂/聚硫醇/叔胺催化剂的混合物中。两种混合物中光聚合单体经紫外光引发聚合形成微相分离后，可分别得到高分子基体/环氧树脂/纳米粒子和高分子基体/聚硫醇/叔胺/纳米粒子两种复合材料。如果将两种材料薄膜进行叠加、两种薄膜某一区域出现裂纹，那么两层薄膜中的环氧树脂和聚硫醇/叔胺将扩散到一起，发生交联反应，从而具有自修复功能。本项目将研究纳米粒子的种类、粒径、形貌、含量和表面修饰方法等对纳米粒子在上述材料中的分散性及对材料力学性能的影响规律和相关作用机理，探索一种新型的具有优异力学性能的可修复材料体系的制备方法。

本课题系统的制备了一系列不同种类、粒径和形貌的无机纳米粒子，并通过使用表面修饰剂或物理包覆有机化合物的方法对其进行表面修饰，然后将所制备的无机纳米粒子分别分散到含有光聚合单体/光引发剂/环氧树脂和光聚合单体/光引发剂/聚硫醇/叔胺催化剂的混合物中。两种混合物中光聚合单体经紫外光引发聚合形成微相分离后，分别得到了高分子基体/环氧树脂/纳米粒子和高分子基体/聚硫醇/叔胺/纳米粒子两种复合材料。而后，将两种材料薄膜进行叠加、两种薄膜某一区域出现裂纹，那么两层薄膜中的环氧树脂和聚硫醇/叔胺将扩散到一起，发生交联反应，从而具有自修复功能。本项目将研究纳米粒子的种类、粒径、形貌、含量和表面修饰方法等对纳米粒子在上述材料中的分散性及对材料力学性能的影响规律和相关作用机理，探索一种新型的具有优异力学性能的可修复材料体系的制备方法。