Polyphenylene ether(PPE)was a high-performance thermoplastic engineering plastic with excellent electrical and heat resistance,which was widely used in new energy vehicles,photovoltaics,electronic appliances and other fields.However,PPE was highly prone to yellowing,especially for the production and use of light-colored PPE products.Therefore,it was of great significance to study the yellowing mechanism of PPE for inhibiting the yellowing of PPE.In this work,the yellowing process of PPE at different temperatures was tested and characterized by X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectrometer(FT1R),lab colorimeter,nuclear magnetic resonance spectrometer(1HNMR),and the yellowing kinetics were proposed.Furthermore,combined with the chemical structure changes during the thermal oxygen aging process of PPE,the yellowing mechanism were proposed and the colorigenic substances were analyzed.
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