高压电场作用下聚合物液体射流微观结构演变规律涉及到静电纺纤维的成型过程、机理、精细结构调节机制等问题。当前针对这一问题的研究还存在较大不足，限制了该技术的进一步发展。本项目拟利用同步辐射光源SAXS线站原位研究电纺过程中聚合物液体射流微观结构演变规律，阐明溶液性质与加工参数对射流的运动轨迹的影响规律，建立不同参数条件下射流运行轨迹的数字模拟模型，掌握聚合物射流介稳体系运动轨迹的调控方法；实现聚合物射流沿电场梯度方向上不同位置的SAXS原位观测，明确射流运动过程中其内部微观结构演变的规律，明晰聚合物微纳米纤维成型过程中微观结构演变与射流运动轨迹的关系；构建射流复杂运动过程中高分子溶液三元体系相图，模拟射流运动过程中不同电场梯度下的微观相态结构，明确纤维成型过程中聚合物微观结构演化机制，建立和完善微纳米纤维可控制备和精细结构调控机制，奠定静电纤维成型理论基础，具有重要理论意义与实际应用价值。

The microstructure evolution of polymer liquid jet triggered by a high voltage electric field involves the formation process and mechanism of electrospun fibers as well as the regulatory mechanism of fiber subtle structures, etc. Presently, the seriously insufficient work on above questions has hindered the further development of electrospinning technique. Therefore, we will implement the in-situ investigation on the microstructure evolution of polymer liquid jet triggered by a high voltage electric field via the synchrotron SAXS in this project. In this work, we will clarify the influence of solution properties and processing parameters on the jet trajectory, establish simulation model of the jet trajectory under different conditions, grasp the trajectory regulation and control method of the polymer liquid jet; we will also realize the in-situ observations on the polymer jet along the electric field gradient direction on different locations via SAXS, knowing the microstructure evolution process of the liquid jet, and the relationship between the microstructure evolution and jet trajectory. Based upon the above work, we establish the three-angle phase diagrams of the polymer solutions in liquid jet with a complex motion process, simulate the microstructure phase of the motorial jet under different electric field gradient, illuminate the microstructure evolution mechanism of polymer in the process of fiber formation, establishing and improving the controllable fabrication rules of micro- and/or nanofiber as well as the regulation mechanisms of their fine structures, laying the theoretical foundation on electrospinning technique, which has important theoretical significance and practical value.