新型共轭铁电聚合物的设计制备与性能

铁电聚合物作为一类重要的功能材料在电子技术领域潜力巨大。当前种类单一（以聚偏氟乙烯及其共聚物为主）的现状限制了其发展，探索新型铁电聚合物具有重要的理论和现实意义。共轭聚合物结构丰富、聚合度和骨架刚性可调、局域有序性可控以及高通量设计合成的物理化学特性有望为新型铁电材料的开发提供全新的设计思路。本申请项目拟以分子工程和聚集态结构调控为主要策略，开展基于功能基元序构的新型共轭聚合物铁电材料的探索。系统研究功能基团、分子链结构、聚集态立体构型等调控对共轭聚合物电极化行为的影响；着重研究共轭聚合物在外电场作用下的偶极排列方式、电畴运动、铁电相变温度以及局域晶体对称性转变规律。希望通过创新材料设计思路并结合机制方面的深入研究，探明共轭聚合物能否产生铁电效应及其机理，重点建立新型共轭铁电聚合物合成的通用方法学，力争在共轭聚合物的铁电新功能构筑方面取得突破。

Ferroelectric polymer as an important functional material has great potential in the field of electronic technology. At present, the single species (mainly focus on polyvinylidene fluoride (PVDF) and its copolymers) limit its development, therefore, it is of great theoretical and practical significance to explore new ferroelectric polymers. The features of conjugated polymers, such as abundant structure, adjustable degree of polymerization and skeleton rigidity, controlled local order and high-throughput design and synthesis, are expected to provide a new design idea for the development of new ferroelectric materials. This project intends to carry out the exploration of new conjugated polymer ferroelectric materials based on the strategy of order structure with functional units. The effects of functional groups, molecular chain structures and stereoscopic configurations on the polarization behavior of conjugated polymers were systematically studied. The dipole arrangement, domain motion, ferroelectric phase transition temperature and symmetry transformation of local crystals of conjugated polymers under external electric field were investigated. It is hoped that the mechanism of the ferroelectric effect of conjugated polymers can be explored through innovative material design and in-depth research on the mechanism. We also hoped that a new general method for the synthesis of conjugated ferroelectric polymers can be established to achieve a breakthrough in the construction of new ferroelectric functions of conjugated polymers.