The two peaks located at 1530.94 cm −1 and 1700.92 cm −1 , as well as the intensity of the characteristic peaks in the region of 900–1350 cm −1 , showed a decreasing trend, which was attributed to the fact that the UV light induced the generation of peroxyl radicals inside the ETPU, which destroyed the carbamate bonds in the molecular chain segments.
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A Comprehensive Study on the Degradation Behavior and Mechanism of Expanded Thermoplastic Polyurethane.
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