Barleany, Dhena Ria and Jayanudin, Jayanudin and Utama, Andriano Suryawan and Riyupi, Ukas and Alwan, Hafid and Lestari, Retno Sulistyo Dhamar and Pitaloka, Alia Badra and Yulvianti, Meri and Erizal, Erizal (2023) Synthesis and Characterization of Chitosan/Polyvinyl alcohol crosslinked Poly(N-Isopropylacrylamide) Smart Hydrogels via γ-Radiation. Materials Today:Proceedings. ISSN 2214-7853 (In Press)

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Abstract

Chitosan-based smart hydrogels with stable mechanics and good flexibility have many desirable qualities and broad applications. In this study, novel smart hydrogels of chitosan crosslinked with poly(N-Isopropylacrylamide) (pNIPAAm) and polyvinyl alcohol (PVA) were synthesized through freezing and thawing procedures followed by gamma (c)-radiation at room temperature. The effect of c-irradiation dose on the gel fraction and water absorption characteristics of chitosan-pNIPAAm hydrogels was investigated. In addition, the structure–property behaviour of the hydrogels was characterized using Fourier Transform Infra-Red (FTIR) spectroscopy and thermogravimetric analysis (TGA). The experimental results revealed that the hydrogels synthesized with a 15-kGy total dose showed a higher gel content (83.73%) compared to 5-kGy and 10-kGy total doses, while the appropriate dose of c-radiation to achieve the highest absorption in water (484.146%) was 5-kGy. The hydrogel characterization test confirmed that cross-linking occurred between pNIPAAm, PVA, and chitosan. A higher the radiation dose resulted in more cross-links in the hydrogel and resulted in better thermal stability. This study confirmed that chitosan/PVA cross-linked pNIPAAm hydrogel with dual pH/temperature stimuli-responsiveness holds promise for various applications.

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