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Sequential and coupled γ radiation-thermal aging of polyphenylene oxide: Behaviors and mechanistic insights
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DOI：10.1016/j.polymdegradstab.2026.112337.png)
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Abstract
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• PPO exhibits path-dependent aging under sequential and coupled γ radiation thermal conditions, with severity ranking CA > SA-RT > SA-TR. • Dual active centers from frozen radicals and non-conjugated cross-links drive differential aging. • Porosity shifts reaction control to kinetic control by enhancing chain mobility and O2 diffusion. • CO2 yield-flexural fracture strain correlation enables equivalent substitution between sequential and coupled modes.
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