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Fourier transform infrared (FTIR) spectra of polylactic acid (PLA) and PLA with different tea polyphenol (TP) contents: (a) PLA fiber; (b) TP powder; (c) PLA with TP (5:1); (d) PLA with TP (4:1); (e) PLA with TP (3:1); (f) PLA with TP (2:1).
