Improvement of gas barrier properties of chitosan-based composite coatings under humid conditions through palmitic acid grafting
Résumé
The chemical grafting of palmitic acid (PA) on chitosan (CS) was performed through the coupling reaction of the carboxyl group of PA with the amine groups of CS in the presence of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC). Fourier Transform InfraRed (FTIR), Differential Scanning Calorimetry (DSC) and 13 C NMR spectroscopies were used to analyze the synthesized chitosan-grafted-palmitic acid (CS-g-PA). Acidified aqueous solutions of CS, a mix of CS and PA (CS/PA) and CS-g-PA (1 wt%), in the presence of different contents of vermiculite (VMT), have been coated on 130 µm thick corona-treated PET films with thicknesses ranging from 1 to 3 µm. Gas permeability of the PET coated films were determined under dry conditions and under different relative humidity ratios. The grafted CS exhibited a higher hydrophobicity which resulted in a fewer loss of barrier properties in humid conditions.
Origine | Publication financée par une institution |
---|---|
Licence |