3.

Overlaid ATR-FTIR spectra of (a) PHU–epoxy/CNC-W and (b) PHU–epoxy/CNC-T nanocomposites with varying CNC loadings, compared to the neat PHU–epoxy matrix.

Overlaid ATR-FTIR spectra of (a) PHU–epoxy/CNC-W and (b) PHU–epoxy/CNC-T nanocomposites with varying CNC loadings, compared to the neat PHU–epoxy matrix.