Induced of gamma irradiation on poly vinyl alcohol (PVA) Hasan Fikri Safar 2 , Ishak Ahmad 1 1 National University of Malaysia, Malaysia, 2 UKM, Malaysia The radiation-based technology promises reliable and green processes such in radiation-induced crosslinking to give suitable way due to free from any chemical initiator. Poly (vinyl alcohol) (PVA) received tremendous demand on various researches recent owing to its own properties. In this study, PVA was prepared at 10 % w/v and radiated with gamma ray at the variation of 0-50 KGy. The polymeric solution was prepared by dissolving PVA powder in distilled water heated until it became homogeneous and cooled under room temperature produce concentration at 10 % w/v. PVA solution were then irradiated with gamma at different doses i.e., 10, 20, 30, 40 and 50 KGy. Freeze drying of PVA samples were carried out for 24 hours. Chemical vapor deposition (CVD) technique was employed for all PVA samples to hydrophobilize the aerogels. PVA aerogels were then exposed to methyltrichlorosilane in closed chamber and placed under room temperature for 24 hours. The silanized aerogels were kept in an oven at 50°C for 24 hours to remove excess silane and byproduct. The water contact angle of PVA samples was increased gradually with dosage of gamma irradiation from 117° to the optimum at 139°. TGA thermograms show that increasing dosage of gamma radiation led to increase the degradation temperature until optimum at 30 KGy. PVA sample with lowest irradiation of gamma has the highest mass of the residue. DSC analysis shows variation on T g value with increasing pattern from 57.6 to 67.6 °C. The thermal analysis of PVA samples were affected by dosage of gamma radiation and silane derivative binding. Study on morphology of PVA aerogels were acquired by SEM. PVA samples with hydrophobic nature and eco-environment were successful develop. The samples can be utilized for future extent in water remediation. References 1. Khozemy, E.E., Nasef, S.M. & Mahmoud, G. A., 2018. Synthesis and characterization of antimicrobial nanocomposite hydrogel based on wheat flour and poly (vinyl alcohol) using γ-irradiation. Advanced Polymer Technology . Pp: 1-10. 2. Varshney, L., 2007. Role of natural polysaccharides in radiation formation of PVA–hydrogel wound dressing. Nuclear Instruments and Methods in Physics Research B. 255: 343-349. 3. Wan Ishak, W.H., Ahmad, I., Ramli, S. & Mohd Amin, M.C.I., 2018. Gamma Irradiation-Assisted Synthesis of Cellulose Nanocrystal-Reinforced Gelatin Hydrogels. Nanomaterials . 8:749.
P22
© The Author(s), 2023
Made with FlippingBook Learn more on our blog