Fig. 4
From: Microplastic extraction protocols can impact the polymer structure
Properties of engineering plastics before and after Fenton and Basic Piranha oxidation. (4.1) SEM images, (4.2) FT-IR spectra, (4.3) Particle size distributions, (a) TPU_ester, (b) TPU_ether, (c) PA-6. BP: oxidation with Basic Piranha. Fenton: oxidation using the Fenton protocol. The polymer particles showed no significant changes in their chemical compositions or particle size distributions following oxidation, but the surface textures of the TPUs were affected by the Basic Piranha oxidation