Precise detection of local relaxation of amorphous polymers at low temperatures <i>via</i> O<sub>2</sub> diffusion probed by a dual-luminescent imide compound.
basic_science · Level V
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- Record sourced from PubMed, PMID 40567121.
- Also identified by DOI 10.1039/d5sm00394f.
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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 (O<sub>2</sub>) diffusion. The PH of the imide compound dispersed in the polymer matrices was quenched by O<sub>2</sub>, and the temperature-dependent variation of the PH intensity indicates that the γ-relaxation of the polymer matrix plays a crucial role in O<sub>2</sub> diffusion. This method offers a novel analytical tool for detecting LR phenomena in amorphous polymers at low temperatures.