Structural, thermal and optical modifications of chitosan due to UV-ozone irradiation

Abstract

THE placesPRESENT in advancedwork research.focused Theon modifying effect of UV-ozonethe chitosan irradiationstructure withwhich differenthas noticeable exposure doses (9.68 x 10-14, 19.35 x 10-14, 29.03 x 10-14 and 38.75 x 10-14 J/m2) on the microstructural, thermal stability and optical properties of chitosan was studied. X-ray diffraction (XRD), selected area electron diffraction (SAED), high-resolution transmission electron microscopy (HRTEM), optical parameters techniques as well as differential thermal analysis (DTA) and thermogravimetric analysis (TGA and DTG), were performed. The obtained results indicated that, effects on semi-crystalline structures have occurred. Detected variations in XRD, SAED, HRTEM, DTA and TGA analyses under investigation may be attributed to the different degrees of crystallinity, induction of structural changes and molecular configuration of chitosan upon exposure to UV-ozone. The results confirmed that the UV-ozone irradiation plays a role in refining the microstructure and changes occurring in chitosan matrix for future biomedical applications.