聚合物/CuInS2三元量子点纳米复合材料通用合成方法研究及应用

聚合物/量子点纳米复合材料具有优异光学稳定性和可加工性，在生命科学和光电子领域具有较高商业价值，但因缺乏通用简便的合成方法而限制其广泛应用。本项目拟采用RAFT活性自由基聚合技术，构建一种制备聚合物共价修饰量子点（QDs）纳米晶的通用方法，并解决低活性及复杂结构聚合物不易稳定结合QDs的问题。通过在低毒性CuInS2量子点表面键合双硫酯衍生物制备QDs链转移剂，并采用RAFT技术实现多种具有代表性乙烯基单体在CuInS2表面的均聚和共聚；在此基础上系统研究每种复合物的分子量、微观结构和光学性能与单体结构间相互关系，揭示聚合物结构对QDs光学性能的影响及变化规律，验证通用合成方法的普适性。利用复合物在生物和光电器件领域的研究，检验该方法的实际应用效果。本研究不仅为设计合成新型纳米晶复合材料提供新的设计思路，简化材料研发过程，缩短周期，且对聚合物/量子点纳米复合材料的产业化及应用奠定坚实基础。

Polymer / quantum dots nanocomposite has a great commercial value in life science and optoelectronics fields owing to its excellent optical stability and workability. But，at present, because there is lack of versatile and convenient synthetic approach, the wide application of polymer / quantum dots nanocomposites is limited. A versatile and convenient synthetic approach of polymer / quantum dots (QDs) nanocomposite will be build based on the reversible addition-fragmentation chain transfer polymerization (RAFT), which can also solve the problem of the unstable combination between less reactive or complex polymer and QDs. A new QDs-chain transfer agent will be synthesized after a dithioester derivative is bonded on the surface of lower toxic CuInS2 QDs. Then, some typical homopolymer and copolymer will be stably connected on the surface of CuInS2 QDs by the way of homopolymerisation and copolymerization of vinyl monomers. The correlations between molecular weight, dispersion, microstructure, optical performance, grafting density of each nanocomposites and monomer structure are studied systematically. And the universality of versatile synthetic approach will be verified by finding the effects and change rules between the polymer structure and optical performance. Moreover, the effect of practical application of versatile synthetic approach is tested by the application researches of nanocomposites in life science and optoelectronics fields. The study can not only offer a new thinking for designing and synthesizing novel polymer / quantum dots nanocomposite, which will simplify the process of research and invention materials to reduce time, but also can build stable foundation for the industrialization and application of these polymer / quantum dots nanocomposites.