Synthesis of full and semi Interpenetrating hydrogel from polyvinyl alcohol and poly (acrylic acid‐co‐hydroxyethylmethacrylate) copolymer: Study of swelling behavior, network parameters, and dye uptake properties

Abstract

Semi and full interpenetrating network (IPN) hydrogels were synthesized by allowing free radical copolymerization of acrylic acid (AA) and hydroxyethyl methacrylate (HEMA) in the matrix of polyvinyl alcohol (PVOH). Accordingly, four different semi IPN hydrogels were prepared with PVOH: copolymer mass ratio of 1 : 1, 1 : 0.75, 1 : 0.5, and 1 : 0.25. These hydrogels were designated as SEMIIPN1, SEMIIPN2, SEMIIPN3, and SEMI-IPN4, respectively. In all of these SEMIIPN, after polymerization PVOH was crosslinked with 2 mass % glutaraldehyde to form the semi IPN structure. In a similar way, sequential full IPN were prepared from PVOH and copolymer of AA and HEMA (designated as PAA-HEMA) with same composition except in this case apart from crosslinking of PVOH by 2 mass % glutaraldehyde the PAAHEMA copolymer was further crosslinked with N,N 0 -methylenebisacrylamide (NMBA) to produce four full IPN hydrogels designated as FULLIPN1, FULLIPN2, FULLIPN3, and FULLIPN4. All of these semi and full IPN type hydrogels were characterized by carboxylic %, FTIR, UV, DTA-TGA, XRD, SEM, and mechanical properties. The network parameters, swelling and diffusion characteristics of these hydrogels were also studied. The performance of these semi and full IPNs were compared in terms of their relative abilities for removing varied concentration of rhodamine B (RB) and methyl Violet (MV) dyes from water.

Swelling, diffusion, network parameters and adsorption properties of IPN hydrogel of chitosan and acrylic copolymer

“…Determination of carboxylic groups present in the hydrogels. The total amount of carboxylic groups (C, mass% of hydrogel) present in the hydrogels was determined by a method reported elsewhere [8,9]. Around 0.5 g of hydrogel sample (w) was taken in 25 ml 0.1 M NaOH solution and after mixing under magnetic stirring for 2 h it was titrated with 0.1 M HCl solutions.…”

Effect of polyethylene glycol and nano clay on swelling, diffusion, network parameters and drug release behavior of interpenetrating network copolymer

“…The strong electrostatic interaction among the functional groups of PEG, clay and the copolymer is evident in the spectra of the composite gel. In the NaMMT filled composite gel (F3.2) the 2889 cm −1 peak of PEG due to its CH 2 stretching 32 shifts to 2919 cm −1 and the 1098 cm −1 peak of PEG corresponding to its COC stretching 38 shifts to 1035 cm −1 . The carbonyl stretching of poly (acrylic acid‐co‐acrylamide)/MBA unit is observed to shift from 1665 39 to 1639 cm −1 .…”

“…The Flory's characteristic ratio, C n was taken from the literature as 6.7 31 and C C bond length 'l' was assumed as 1.54 0 A. 32 M r , the molecular weight of the repeat unit was calculated as the weight average of the repeat unit of PEG and the copolymer.…”

Enhancement of dispersion stability of inorganic additives via poly(sodium-4- styrenesulfonate) treatment geared to hydrogel applications

“…Mandal and coworkers were studied RB adsorption of IPN hydrogel obtained by copolymerization of acrylic acid and hydroxyethylmethacrylate in PVA matrix. They were found the amount of adsorbed dye by hydrogel at about 0.08-0.12 mg/g at a maximum PVA ratio (0.5 wt.%) it was reported that this value was increased up to about 0.12 mg/g after 250 minutes [41]. As far as we know, although no such modification has been made in the literature, considering similar studies mentioned above, it is thought that the proposed method for preparing hydrogel with inorganic fillers modified with the dip-dry technique could be contributed to the dye removal.…”