Fabrication and characterization of poly(vinyl alcohol)/chitosan hydrogel thin films via UV irradiation

Influence of Poly (Ethylene Glycol) on the Characteristics of γ Radiation-Crosslinked Poly (Vinyl Pyrrolidone)-Low Molecular Weight Chitosan Network Hydrogels

“…Meanwhile in L10 and L15 images, the networks are less dense with bigger pores. The hydrogel L10 shows interconnecting pores with uniform pore size contribute to better swelling property (Nguyen & Liu 2013). Meanwhile hydrogel L15 with unlinked pores and nonuniformity of pore size indicate weak swelling behavior.…”

“…The hydrogel L shows low water uptake due to its high crosslinking density and tighter pores. These properties decrease the water molecules movement into its network (Nguyen & Liu 2013). The hydrogel L in pH7.0 FIGURE 3.…”

“…The hydrogel pieces were weighed and placed in the tea bag and tighted. The tea bags were soaked in the water at temperature of 60ºC for 8 h. The tea bags were taken out from the hot water, rinsed with distilled water and placed into drying oven at 60ºC (Nguyen & Liu 2013). The drying process was done until the weight of tea bags and hydrogel constant.…”

“…The preparation of hydrogels via ionizing radiation such as gamma (γ) ray and electron beam has been established for decades. It is considered as green technology because it requires no reaction initiator and chemical crosslinker, no harmful chemicals utilized, the reaction can be done at ambient temperature, requires no purification on the end products and gives no toxic chemicals leftover (Nguyen & Liu 2013;Soler et al 2012;Yang et al 2010).…”

“…The water absorption ability of hydrogels is dependent on the presence of functional groups in the hydrogels, the state of water (pH and ionic content), density of the crosslinkednetwork and the hydrophilic/hydrophobic polymer content (El-sherbiny & Smyth 2012;Nguyen & Liu 2013;Riva et al 2011;Zhang et al 2015b;Zhao et al 2006). Although hydrogels are very hydrophilic, hydrogels are not soluble in the aqueous media due to the presence of crosslink networks.…”