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

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.