Precise detection of local relaxation of amorphous polymers at low temperatures via O2 diffusion probed by a dual-luminescent imide compound†
Abstract
Local relaxation (LR) of six types of amorphous polymers was precisely monitored at low temperatures (<160 K) using the intensity ratio of phosphorescence (PH) to fluorescence of a dual-luminescent imide compound as a probe for oxygen (O2) diffusion. The PH of the imide compound dispersed in the polymer matrices was quenched by O2, and the temperature-dependent variation of the PH intensity indicates that the γ-relaxation of the polymer matrix plays a crucial role in O2 diffusion. This method offers a novel analytical tool for detecting LR phenomena in amorphous polymers at low temperatures.