γ-Irradiation effects on the thermal and optical properties of undoped and eosin doped 70/30 (wt/wt%) PVA/glycogen films

• Published in: Current applied physics Vol. 8; no. 1; pp. 78 - 87
• Main Authors: Abd El-kader, F.H., Gaafar, S.A., Mahmoud, K.H., Bannan, S.I., Abd El-kader, M.F.H.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2008; 한국물리학회
• Subjects: Colour detection; Optical parameters; PVA/glycogen; Thermal properties; γ-Irradiation; 물리학; Thermal properties; γ-Irradiation; Optical parameters; PVA/glycogen; Colour detection
• ISSN: 1567-1739; 1878-1675
• DOI: 10.1016/j.cap.2007.05.004

Differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), UV/visible spectra and colour detection of pristine and γ-irradiated undoped and eosin-doped 70/30 (wt/wt%) PVA/glycogen has been measured. The kinetic parameters such as the activation energy, entropy, enthalpy and free energy for all investigated samples were determined using Coats–Redfern relation. The shift of T g position towards lower temperatures with increasing γ-doses reflect that the degradation process is the predominant one. The values of absorbance and optical parameters in UV/visible range for γ-irradiated blend sample doped with eosin showed no significant variation with increasing γ-doses. This reflects that the addition of eosin to 70/30 (wt/wt%) PVA/glycogen makes it more resistant to γ-radiolysis. The calculated colour parameters such as L ∗, U ∗, V ∗, C ∗, hue and Y e were found to be dependent on addition of eosin and γ-irradiation.