纳米粒子的功能性依赖于其空间的有序排列。本项目提出构建新型嵌段聚合物接枝纳米粒子刷作为组装单元，利用二元共混体系中粒子表面接枝的AB型和BA型嵌段聚合物之间的“Lock and Key”弱相互作用，即粒子刷内外两侧的A/B嵌段与B/A嵌段间的定向相互作用，控制纳米粒子在组装结构中的排列和间隔。采用一步法合成表面锚固ATRP引发剂的纳米片和纳米球，采用SI-ATRP分别合成AB型和BA型嵌段聚合物接枝的粒子刷。研究嵌段聚合物的组成、聚合度和接枝密度对自组装过程和相分离微区大小的影响。通过研究组装基元间弱键相互作用的协同规律，合理设计材料的结构及组成，引导纳米片层层组装成微观有序的"砖-泥"结构，获得高强高韧聚合物纳米复合材料。拓展到二元量子点粒子刷体系，研究获得一次大面积制备二元超晶格结构的透明二元复合量子点膜。可望获得仿生功能复合材料应用在生物医学、高阻隔/阻燃、光学显示材料等领域。

The functional properties of solid nanoparticles depend on the orderly space arrangement. In this project, by using the "Lock and Key" effect, we will build a novel assembly unit of block copolymer tethered nanoparticle brushes to regulate their space order and to obtain three-dimensional ordered nanoparticle/polymer composites by taking the advantage of the interactions between binary blend systems of AB type and BA type block polymer. That is, by the directional interactions between the A/B blocks and B/A blocks tethered on different nanoparticles, nanoparticles undergo layer-by-layer assembly through the complementary pairing. The arrangement and spacing of nanoparticles in each assembly structure are controlled, and the properties of composites can be regulated by the multiple synergistic effects between components, which is realized in the bottom-up manner. In order to explore the interactions between polymer ligands among nanoparticle brushes, nanoplatelets and quantum dot@silica nanospheres, which are used as the model of assembly units, will first be synthesized and surface modified by one step process to obtain ATRP initiator anchored nanoparticles, then homopolymer A and homopolymer B tethered nanoparticle brushes are synthesized using SI-ATRP technology, respectively. Furthermore, AB type and BA type block copolymer tethered nanoparticle brushes will be prepared by SI-ATRP. By using this strategy, the effects of the chemical composition, degree of polymerization, and grafting density of the block polymers on the self-assembly process and the domain size of the separated phase will be studied. By adjusting the molecular weight of polymer brushes and the density of grafting, the self-organization of microstructure can be achieved by Lock and Key effect, and multi-component, multi-scale and multi-layer composite materials can be obtained. More importantly, the mechanism, method, and technology system can be extended to different grafted copolymer tethered different nanoparticles, such as the quantum dot①-g-A-b-B和quantum dot②-g-B-b-A system, to achieve orderly and controllable distribution of different nanoparticles in polymer matrix, and to obtain self-standing multiple functional hybrid composite materials.