Influence of potassium hydrogen phthalate on thermal, mechanical, structural and surface properties of Chitosan/PVA blend films

摘要

The Potassium hydrogen phthalate (KHP) doped Chitosan/Polyvinyl alcohol (CPK) blended films were prepared by solution casting technique. The different instrumental methods were utilized to investigate the influence of KHP on Chitosan/Polyvinyl alcohol blended films. The interaction and miscibility of prepared blend films were confirmed by Infrared Spectroscopy and Differential Scanning Calorimetry (DSC) analysis. The CPK blend films showed higher thermal stability than the Chitosan/Polyvinyl alcohol (CP) blend film. The mechanical properties of the CP blend films were improved after the addition of KHP. Increased amorphous nature of CPK blend films was observed through the X-ray diffraction (XRD) patterns. The surface roughness was analyzed by Atomic Force Microscopy (AFM) suggest that the KHP exists in the films owing to strong interactions. The hydrophobic nature of the CP blend was enhanced after the addition of KHP, which is verified by measuring the water contact angles. These investigated properties fitted with the properties which are applicable for the packaging and coating applications.