Interface chemical mapping of sulfonated cellulose nanocrystal/sPEEK nanocomposites
Résumé
Nanocomposites of sulfonated poly(ether ether ketone) (sPEEK) reinforced with chemically modified tunicate cellulose nanocrystals (T-CNCs) as partially biosourced proton-conducting membranes were prepared. Their morphology, mechanical properties, gas permeability, and chemical composition at macroscopic and microscopic scales were characterized. Aiming on the characterization of the filler-matrix interfaces, the Photoinduced Force Microscopy (PiFM) technique was used to collect spectroscopic information at the nanoscale. The PiFM allowed visualizing the improved dispersion of T-CNCs by the surface sulfonation of the CNCs. The precise analysis of the chemical composition of the nanoscale interface by PiFM also highlights the likely heterogeneous nature of this modification. This provides insight into the quality of the chemical functionalization as well as the interfaces with the potential for optimizing the nanocomposite properties and manufacturing techniques, aiming to enhance both the mechanical properties and conductivity of membranes reinforced with nanocellulose.
Domaines
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