From photophysical evidence, we suggest a structural model based on intrach
ain ordering that can account for the thermoreversible changes of the absor
ption spectrum of poly(9,9-dioctylfluorene) films under certain physicochem
ical treatment protocols. We correlate this model to the results of X-ray f
ibre diffraction experiments. (C) 2000 Elsevier Science S.A. All rights res
erved.