多重响应型Pickering乳液由于能够拓宽乳状液的可控范围和提高控制精度成为近年来人们研究的热点之一，但是绝大多数研究仅限于单一或两重刺激响应相结合的乳状液，另外用于稳定Pickering乳液的固体纳米粒子功能化可控性差且使用后不易回收再利用。基于此，本项目拟基于RAFT技术在磁性纳米粒子表面制备一系列结构明确和链段长度可控的聚合物，使其具有不同亲疏水性和可回收再利用性，旨在拓宽、深化该领域的基础研究。筛选出具有应用前景的聚合物修饰磁性纳米粒子，将其用于构筑pH、温度和磁性三重响应型乳液，分析其分散与粘附到油水界面的作用效果，探究其三重响应性对乳状液中液滴形貌和运动状态的影响，总结出其表面性质及作用行为对稳定乳状液和使乳状液破乳的规律，为其在石油开采和运输等应用领域提供理论支持。

Multi-response Pickering emulsion has been one of the hot topics in recent years because it can broaden the controllable range of emulsion and improve the control accuracy. However, most of the studies are limited to single or double stimulus-response emulsion. In addition, the solid nanoparticles used to stabilize Pickering emulsions are poorly functionalized and difficult to recycle and reuse. In this project, a series of polymers with clean structure and controllable chain length are prepared on the surface of magnetic nanoparticles based on RAFT technology to make them have different hydrophobicity and recyclability, aiming to broaden and deepen the basic research in this field. The polymer modified magnetic nanoparticles with potential applications are screened and used to construct pH, temperature and magnetic three stimuli-responsive emulsions. The effect of dispersion and adhesion on the oil-water interface are analyzed, and the surface properties and action behavior of magnetic nanoparticles on the stability and demulsification of emulsions are summarized. These studies will provide theoretical support for the application of surface functionalized magnetic nanoparticles in oil exploitation and transportation.