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Precise detection of local relaxation of amorphous polymers at low temperatures via O2 diffusion probed by a
Rika Watanabe1, Marina Doi1, Haonan Liu1
1Department of Chemical Science and Engineering, Institute of Science Tokyo, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan. ando.s.aa@m.titech.ac.jp.
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.
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