Erizal Erizal(1*), Rahayu C Rahayu C(2)

(1) Centre for the Apllication Technology of Isotopes and Radiation, National Nuclear Energy Agency, Jl. Cinere Ps. Jumat PO BOX 7002, JKSKL 12070, Indonesia
(2) Centre for the Apllication Technology of Isotopes and Radiation, National Nuclear Energy Agency, Jl. Cinere Ps. Jumat PO BOX 7002, JKSKL 12070, Indonesia
(*) Corresponding Author


Interpenetrating networks (IPN) crosslinked polymer of polyvinyl alcohol (PVA) containing copolymer N-isopropylacryalmide (NIPAAm) were fabricated by radiation technique and characterized in terms of their aqueous swelling and critical behaviour. The influence of irradiation dose (> 10 kGy) and PVA concentration (5-15%wt ) on the gel fraction and swelling properties were investigated. With an increase of -γ irradiation dosage, the gel fraction of hydrogels was inclined to increase but the swelling behaviour decreased markedly. The incorporation of PVA into NIPAAm by irradiation led a significant increase in swelling capability when comparing to the pure homopolymer (NIPAAm) hydrogels. In addition, the shrinking rate upon heating was significantly improved if the PVA content in poly(PVA-co-NIPAAm) hydrogels was less than 15% wt%. at temperature exceeding the collapsed transition point, all copolymer gels collapsed to a state of nearly complete dehydration. Based on its swelling-deswelling properties in the repeated application, the hydrogels are stable and showed a behaviour as matrix pumping system/on-off. The hydrogels would have potential applications in chemistry, pharmacy, and health care purposes.


Hydrogel; PVA; Nipaam; radiation; swelling; LCST.

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