Abstract
There has been recognized that there exist three basic relaxation modes in the molecular dynamics of liquid crystalline side chain polymers (SCLCP) – the α-, β- and δ-relaxation process, and the molecular mechanism of the δ-relaxation has been in controversy, i.e. whether it is a “flip-flop” transition or a continuous rotation. The current study provides the experimental evidence of the multiple steps relaxation by time-resolved emission spectroscopy, taking the intrinsic fluorescence from the model mesogen group of 4-cyanobiphenyl. The temperature dependence of the spectra and its dynamics provides new information on the microscopic picture of the δ-relaxation.
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