The absorption spectra were recorded using a Tensor 27 Spectrometer (Bruker, Germany) with a resolution of
4 cm1 and making 32 scans.
For the dynamically vulcanized PLA/NR blends, the injection molded blend specimen was first extracted with dichloromethane at ambient temperature for 3 days to selectively remove free PLA thoroughly, then the residue crosslinked NR was compressed into disks for the FT-IR test using the attenuated total reflectance (ATR) model.
All FT-IR samples were ovendried under a vacuum to eliminate the effects of residual solvent and moisture prior to testing.