Radiation synthesis of superabsorbent polyethylene oxide/tragacanth hydrogel

Hydrogels: Methods of Preparation, Characterisation and Applications

“…Cross-linked networks of synthetic polymers such as polyethylene oxide (PEO) (Khoylou & Naimian, 2009), polyvinyl pyrollidone (PVP) (Razzak et al, 2001), polylactic acid (PLA) (Palumbo et al, 2006), , polyacrylic acid (PAA) (Onuki et al, 2008), polymethacrylate (PMA) (Yang et al), polyethylene glycol (PEG) (Singh et al), or natural biopolymers (Coviello et al, 2007) such as alginate, chitosan, carrageenan, hyaluronan, and carboxymethyl cellulose (CMC) have been reported. The various preparation techniques adopted are physical crosslinking (Hennink & Nostrum, 2002), chemical cross-linking (Barbucci et al, 2004), grafting polymerisation (Said et al, 2004), and radiation cross-linking (Fei et al, 2000;Liu et al, 2002b).…”

Fast Swelling Superabsorbent Hydrogels Starch Based Prepared by Gamma Radiation Techniques

“…In addition, the acrylic acid containing carboxylic groups (COOH) as hydrophilic groups is easily binding with water molecules to form hydrogen bonds with water. Some researchers reported that acrylic acidbased superabsorbent hydrogel absorbs large amount of water with the rate swelling in the range of minutes, hours and days [10,[12][13][14]. Hence, it is indicated that the combination of starch with AAM-AA in the powder form of hydrogel prepared at a low irradiation dose (7.5 kGy) when compared with granular form (previous work) were greatly improved the capacity of hydrogels to absorb water.…”

Stimuli-responsive hydrogels in drug delivery and tissue engineering

“…The (mixture of 0.2% Gelrite and 0.6% alginate) solution showed a significant enhancement in gel strength at physiological condition. Vodithala et al (2010) developed ion-activated ocular in situ gels of ketorolac tromethamine using gelrite as a polymer and concluded that the developed formulations showed sustained release of drugs for up to 6 h. The formulations were found to be non-irritating with no ocular damage (Khoylou & Naimian, 2009). …”

“…Due to swelling of membrane, more drugs is released than the membrane in the less-swollen state. Khoylou & Naimian (2009) 9. Phenylborate-poly(vinyl alcohol) Preparation of Intelligent stimuli-responsive delivery systems using hydrogels that can release insulin in self-regulated manner.…”