表面官能化单分散磁性微球的制备与光子晶体的构筑

This project focuses on the synthesis and application of monodisperse surface-functional magnetic microspheres. Various polymer brushes are grafted on the surface of SiO2-magnetic composite nanoparticles via surface-initiated RAFT polymerization in order to prepare highly monodisperse superparamagnetism hybrid microspheres with uniform and controllable size, and then di-block copolymer brushers modified magnetic microspheres will be prepared via post-polymerization modification. We will research and compare the reaction kinetics of magnetic microspheres with different surface properties; explore their self-assembly behaviors in corresponding mediums and even in magnetic field inducing; ascertain the effects of the inner structures of microspheres (grafting density, size, and chain conformations) and environmental conditions (magnetic, pH, temperature) on the self-assembly behaviors. On the basis of above work, we will grope the forming condition of photonic crystals constructed by magnetic microspheres, as well as the regulatory mechanism about their optical performances, so that more references could be provided for the structure design and performance optimization of the environmental responsive photonic crystal materials.

本项目拟就表面官能化单分散磁性微球的制备和应用开展研究工作。通过表面引发的RAFT聚合在二氧化硅复合的磁性纳米粒子表面接枝不同种类的聚合物刷结构，制备单分散性、尺寸均匀可控、且具有超顺磁性的杂化微球，并采用后聚合改性的方式实现两嵌段共聚物在磁性微球表面的接枝聚合。研究并比较具有不同表面性质的磁性微球的反应动力学，考察它们在相应介质中以及在磁诱导作用下的自组装行为，探明微球的内部结构（接枝密度、微球尺寸、链构象等）与外界环境（磁场、pH值、温度等）同自组装行为的内在联系。在此基础上，摸索磁性微球形成光子晶体结构的条件及其光学性能的调控机制，为具有环境响应性光子晶体材料的结构设计和性能优化提供参考依据。

本项目就表面官能化单分散磁性微球的制备和应用开展研究工作。通过表面引发的RAFT聚合在二氧化硅复合的磁性纳米粒子表面接枝不同种类的聚合物刷结构，制备单分散性、尺寸均匀可控、且具有超顺磁性的杂化微球。实验结果表明，聚合物曾能够实现在磁性纳米微球的包覆，且尺寸可控。同时，利用表面接枝官能团的磁性微球，制备系列磁性水凝胶，赋予凝胶多重环境响应性，考察了凝胶的拉伸性能、溶胀性能和温敏性，磁性纳米微球复合的水凝胶具有良好的力学强度、溶胀稳定性和温度响应性。