In situ Characterization of Phase Transition of Amorphous Poly(9,9-di-n-octyl-2,7-fluorene) Thin Film During Thermal Annealing

Correlation between Molecular Stereostructure, Film Microstructure, and Electronic Structure of Polyfluorene and Fluorene Based Alternating Copolymers F8BT and PFO–DBT

“…Polyfluorenes have become the focus of interest for chemists and materials scientists due to their potential in display applications, high charge-carrier mobility, good processability, and the possibility to synthesize a variety of tailored polyfluorene-based copolymers with varied backbone and chains structure. A better molecular stacking accompanied by an improved effective intra/intermolecular charge transport was observed in thin films with the rigid coplanar structure of β-phase. , Grazing incidence X-ray diffraction, UV–visible (UV–vis) absorption spectrophotometry, and Fourier transform infrared spectroscopy were used by Meng et al to characterize in situ crystallization of amorphous polyfluorene films via thermal annealing. According to the authors, the side chains’ rearrangement prevailed over the movement of the main chains under lower temperatures, while the rearrangement of the main chains was dominant when the temperature was higher than 80 °C.…”