Synthesis of Novel Polysaccharide-Based Superabsorbent Hydro Gels Via Graft Copolymerization of Vinylic Monomers onto Kappa-Carrageenan

Abstract

Highly water-absorbing polymers of neutralized poly(acrylic acid-co-MAA) onto Kappa-carrageenan were synthesized in an effort to investigate the influences of invironment parameters(pH, salinity) on water absorption. The polymerization reaction was carried out in an aqueous medium and in the presence of ammonium persulfate (APS) as an initiator. The structure of hydrogels were confirmed by FTIR spectroscopy Kappa-carrageenan and the hydrogels as well as solubility characteristics of the products.. In addition, the extent of water absorption and the absorption rate were studied to determine their relationship with the invironment parameters.

Versatile Fabrication Approach of Conductive Hydrogels via Copolymerization with Vinyl Monomers

“…Networks with acrylic acid and HEMA introduced at different amounts exhibited swelling ratios of ∼2500%. This is in agreement with previous studies, which have shown that incorporating acrylic acid into a copolymer network can provide higher water sorption in the system. , Incorporation of the acrylic acid ionic monomer significantly increases the water uptake of hydrogels due to charge repulsion caused by its ionized carboxylic side groups on adjoining polymer chains at pH 7.4. , In contrast, HEMA contains a nonpolar methyl side group and as a result is hydrophobic relative to acrylic acid, which accounts for the significantly lower swelling ratios obtained . As will be shown by the SEM micrographs and in agreement with the literature, , we found a close correlation between the swelling ratios of the hydrogels and their internal microstructure.…”

“…By copolymerizing the two monomers at equal molar ratios, we achieved hydrogels with an intermediate Young moduli (97.72 ± 9.71 kPa for PEDOT_AA_HEMA). The effect of varying the comonomer compositions on the mechanical properties of hydrogels is well investigated in the literature. ,,− In our case, increasing the relative content of the more hydrophilic monomer with ionizable groups led to increased repulsion between the polymeric chains, which in turn allowed for easier penetration of water molecules inside the network. This open structure weakens the mechanical properties of highly swollen hydrogel systems, such as our PEDOT_AA and PEDOT_3AA_HEMA.…”

Recent Advances in Edible Polymer Based Hydrogels as a Sustainable Alternative to Conventional Polymers

“…The swelling ratio was affected by pH, having a maximum swelling at pH 9. Sadeghi et al investigated the effect environment parameters (like pH and salinity) on the swelling capacity of vinylic monomers (such as acrylic acid, acrylamide, and methacrylic acid) grafted kappa carrageenan based superabsorbent hydrogel . The swelling degree exhibits pH sensitivity and the maximum water absorption was recorded at pH 8.…”

Investigation of the Thermo-Mechanical Properties of Blend Films Based on Hemicelluloses and Cellulose

“…Biomass is the most abundant lignocellulose that consists mainly of cellulose, hemicelluloses, and lignin [5]. In those materials, cellulose and hemicelluloses have been widely applied due to their biocompatibility, biodegradability, potential film forming, and nonpoisonous content [6][7][8].…”