偏氟乙烯聚合物晶体结构调控

项目名称： 偏氟乙烯聚合物晶体结构调控

项目编号： No.21274057

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 沈群东

作者单位： 南京大学

项目金额： 80万元

中文摘要： 铁电高分子电性能多样化且卓越，能够满足现今对能源储存和利用的需求，应用领域正不断扩大。本项目拟围绕偏氟乙烯微结构与能量存储与转换特征的内在关联性这个基础与前沿科学问题。其中极性晶畴是控制铁电高分子电性能的关键结构因子，申请人的思路是将高分子的结晶过程细分为成核和生长过程；通过添加成核剂、化学交联、接枝等方法控制偏氟乙烯共聚物中成核密度或结晶链段的长度和含量，获得不同尺寸与组成的极性晶畴。本项目将研究铁电高分子与非极性高分子形成的二元复合物，利用两相界面效应调控极性组份的结晶过程和电荷分布。本项目采用纳米加工技术，获得具有纳米尺寸的图案、能用于薄膜高密度数据存储器或场效应晶体管的铁电高分子薄膜，研究铁电高分子晶体在精确设计的纳米空间的受限生长情况。本项目意在体现铁电高分子研究从应用和材料物理等向高分子学科基础研究的回归。

中文关键词： 铁电高分子；晶态材料；微结构；电性能；偏氟乙烯聚合物

英文摘要： Ferroelectric polymers have diversified and excellent electrical properties that satisfy the demands of modern energy storage and utilization. The range of their application is significantly expanded. The project aims at the fundamental and frontier issues, which concern about relationship between microstructure and energy storage and transformation. Polar crystalline domains are key structure factor to control the performance of ferroelectric polymers. The idea of the applicant is that nucleation and crystal growth during crystallization should be considered separately. The nucleation density and length/content of crystallizable units in the polymers will be controlled by addition of nucleating agent, crosslinking reaction, and grafting modification. It affords polar domains with different size and composition. The project will also study binary composites of ferroelectric polymers and nonpolar polymers. The interfacial effect can regulate crystallization of polar components and charge distribution in the ferroelectric polymers. The project makes further effort on ferroelectric polymer patterns with nanoscale features, which can be used in thin-film high-density data storages or field-effect transistors, by nanoimprinting technology. The crystal growth of ferroelectric polymers confined in nanoscale space will

英文关键词： Ferroelectric Polymers；Crystals；Microstructure；Electrical Properties；Vinylidene FLuoride Polymers