目前，基于离子液体的环境响应智能材料是离子液体研究的重要发展方向之一。与温度、压力、光类似，溶液pH值是一种有效的环境响应方式，已在控制释放等过程中发挥了重要的作用。本项目拟通过分子设计，在阳离子、阴离子上引入对pH响应的羧基、氨基等官能团来合成pH响应离子液体。在此基础上，系统研究阳离子的结构、烷基链的长度、官能团的特性、阴离子的类型对这些离子液体在水等分子溶剂中的粘度、摩尔电导、表面张力、pKa值、溶解度、极性、酸碱性等物理化学性质以及离子液体与分子溶剂相互作用的微观本质、阴阳离子之间的缔合、阳离子或阴离子的簇集等微观结构形成的影响规律，分析离子液体在溶液中的微观结构与物理化学性质之间的关系，探索溶液pH值对离子液体溶液微观结构和宏观性质的调控作用，为实现pH响应离子液体溶液结构和控制释放性能的有效调控提供重要信息。

At present, ionic liquids- based environmentally responsive smart materials is one of the important directions in research and development of ionic lquids(ILs). Similar to temperature,pressure and light, solution pH is an effective environmentally responsive way, and has played an important role in controlled release. In this project, pH-responsive ionic liquids with pH-responsive groups such as carboxyl and amino groups in the cations or anions will be synthesized based on the molecular design. The effect of the cationic structure, alkyl chain length, functional group property and anionic type of the ILs on the physicochemical propersities (such as viscosity, molar conductivity,surface tension, pKa value, solubility, polarity, acidic and basic property) of ionic liquids in molcular solvents, the nature of the interaction between ionic lqiuid and molcular solvents, and the microstructures for ion associate of cation with anion and for the aggregate of cation or anion is systhematically investigated. The relationship between the microstructure and physicochemical properties of the ILs in solution is analyzed. The modulated role of the solution pH on the microstructure and macroscopic property of ionic liquids solutions is explored. These results will provide important information for the effective modulation of the structure of ionic liquids in solutions and the performation of controlled release.