聚芴类共轭聚合物(PFs)从溶液到薄膜凝聚态演变过程中的定量构效关系

Quantitative Structure-property Relationship of Polyfluorene Conjugated Polymers Condensed State from Solution to Film

聚芴(polyfluorenes,PFs)是一类具有高荧光效率和良好热稳定性的经典蓝光共轭聚合物.本研究组近年来集中于聚芴类共轭聚合物溶液中单链构象-聚集态结构-薄膜凝聚态结构-器件性能间的定量构效关系研究,利用静/动联用激光光散射等表征手段,结合标度率研究方法,对PFs成膜前体溶液复杂的单链和聚集的形态结构进行了系统的研究.结合光谱与电镜等方法,揭示出PFs在溶液中孤立单链、凝聚态结构、β构象及其过渡态结构形成的动力学过程、机理及规律,构建出成膜前体溶液单链构象-薄膜中链构象-器件性能之间的定量构效关系.旨在从高分子本征性质入手,提高其光电效率.本研究不仅对聚芴类高分子,而且对整个共轭聚合物类材料的设计与加工都将具有重要的指导意义.

Polyfluorenes are not only a class of classical blue conjugated polymers with high fluorescence efficiency and good thermal stability, but also a hairy-rod polymer model due to their rigid main chain and flexible side chain. Therefore, PFs have received attention and related reports are continuing. Most of the research on PFs has focused on the synthesis of new functional materials and the improvement of device structure to improve their photoelectric properties. However, the research on single chain conformation, chain aggregation structure, film condensed structure and photovoltaic devices performance in the process of precursor solution to film are rarely reported. In recent years, our research group focused on the quantitative structure-property relationship of polyfluorene conjugated polymers condensed state from solution to film. The complex single chain and aggregate shape characteristics of PFs precursor solutions were studied by static/dynamic laser scattering and other methods. Combining spectroscopy, electron microscopy and other methods, the kinetic evolution of PFs in isolated single chain, aggregation condensed-structures, transition state and the mechanism and regularity of β-conformation are revealed. Quantitative structure-property relationship of single-chain conformation of precursor solution, aggregate structure of thin film and optoelectronic device performance is established. The aim is to improve the photoelectric efficiency of the polymer from the intrinsic properties. The research will have important guiding significance not only for polyfluorene-based polymers but also for the design and processing of the entire conjugated polymer materials.