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?/span>2 U?/span>?/span>?/span>?/span>?/span>?/span>?/span>(a)?/span>?/span>TPU?/span>FTIR?/span>?/span>(b)-NHhydrogen bonding?/span>-NHfree?/span>FTIR?/span>?/span>(c)=C=O?/span>?/span>?/span>FTIR?/span>?/span>?/span>


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?/strong>?/strong>q?/strong>?/strong>

https://doi.org/10.1002/app.51346

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