Characterization and optical studies of 90/10 (wt/wt%) PVA/β-chitin blend irradiated with γ-rays

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2014-10, Vol.131, p.564-570
• Main Authors: Abd El-Kader, F.H., Gaafer, S.A., Abd El-Kader, M.F.H.
• Format: Article
• Language: English
• Subjects: Gamma irradiation; IR spectroscopy; Optical parameters; PVA/β-chitin
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2014.04.088

Chromaticity diagram of pristine and irradiated 90/10 PVA/chitin (wt/wt%) at different γ-doses. [Display omitted] •γ-Irradiation affects both degree and index of crystallinity for PVA/β-chitin blend.•Values of absorption edge, band tail and color parameters vary with γ-radiolysis.•The locations of the irradiated samples on the chromaticity diagram are different. X-ray diffraction, IR spectroscopy and UV/visible spectra were studied as a function of gamma irradiation doses (5–100kGy) for 90/10 (wt/wt%) PVA/β-chitin. A new intense reflection peak at 2θ=21.5° appeared in the X-ray spectrum of the sample irradiated at 50kGy γ-dose. Besides, the band centered at 2931cm−1 in IR spectrum splits into two clearly separated bands around 2919 and 2941cm−1 for the sample irradiated at 10kGy γ-dose. The disappearance of the absorption band at 280nm of PVA in the blend sample indicates that the ligand PVA becomes opaque in the UV region and provides evidence for the miscibility between homopolymers. The value of absorbance, in UV/visible range, at 10kGy γ-dose was the highest one compared to the other γ-doses. The location of the γ-doses on the chromaticity diagram was different, indicating the change in the spectral colors of the investigated blend. In addition, the absorption edge, band tail and color parameters values were determined as a function of γ-doses.