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(a) 3D image of FTIR spectra of the WPU; (b) 3D image of FTIR spectra of the BP/BN/WPU; (c) The FTIR spectra of BP/BN/WPU obtained at different temperatures; (d) The enlarged image for comparison of the biggest mass loss in the second TG stages of the pure WPU and BP/BN/WPU.
