动态共价型两亲聚合物聚集体稳定的Pickering乳状液及其刺激响应性机理研究

对Pickering乳状液的稳定性进行可控调节，实现乳化剂的循环回收利用，是Pickering乳状液在应用领域面临的一大挑战，而发展环境刺激响应性乳化剂是解决这一难题的有效手段。本项目基于“亲亲相疏”的理念，提出了一种利用动态共价键原位制备两亲聚合物聚集体乳化剂的策略，通过环境因素调控水溶性前驱体与乳化剂之间的转变，实现Pickering乳状液在稳定和破乳间的可控调节。本项目系统研究此类动态共价型两亲聚合物的溶液自组装行为与影响因素，揭示聚集体形成与转变的机理。以动态共价型两亲聚合物聚集体为乳化剂，制备并研究影响Pickering乳状液性质的因素与机制，阐明稳定Pickering乳状液与刺激诱导破乳的一般性规律，进而探索刺激响应性聚集体在石油领域的应用。本项目的实施不仅为刺激响应性乳化剂的开发提供了新思路，而且为该类Pickering乳状液的应用奠定理论基础。

The development of Pickering emulsions with controlled stability to recycle emulsifiers is still a big challenge especially in the fields of application. The employment of stimuli-responsive emulsifiers is an efficient way to overcome the difficulty. In this project, a new method is proposed to develop amphiphilic polymers in situ by the dynamic covalent bond, in which the amphilicity of polymers comes from the mixtures of hydrophilic chemicals. Accordingly, the transition between the hydrosoluble precursors and amphiphilic polymers could be controlled by various environmental factors, and thereby endowing Pickering emulsions with the controlled stability. Herein, the self-assembly behaviors of dynamic covalent amphiphilic polymers will be studied in detail, the formation and transition mechanisms of amphiphilic polymer aggregates will be clarified. In order to reveal the general rule of the stability and stimuli-induced demulsification of Pickering emulsions, the properties of Pickering emulsions stabilized by amphiphilic polymer aggregates at different conditions will be studied systematically, and the application of those amphiphilic polymer aggregates in the crude oil field will also be performed. This project not only provides a new way to develop stimuli-responsive emulsifiers, but also benefits the application of the new Pickering emulsions with scientific foundation.