Radiation crosslinking and sorption properties of hydrogels based on 1‐vinyl‐2‐pyrrolidone, hydroxyethyl methacrylate, and their copolymers

Abstract

This work has been concerned with the synthesis of the hydrogels of poly (vinyl pyrrolidone) (NVP), poly (hydroxy ethylmethacrylate) (HEMA), and their copolymer under the effect of gamma radiation in the presence of N,N-methylenebisacryl-amide (MBAm) as a crosslinking agent. The effect of the different factors that may affect the gelation and yield product, such as solvent composition and irradiation dose, was investigated. The formed hydrogels were characterized in terms of swelling in water and different organic solvents, X-ray diffraction (XRD), and IR spectroscopic analysis. The sorption capability of these hydrogels towards some commercial basic and acid dyesstuffs was also studied. The results showed that a solvent mixture composed of equal contents of water and methanol is the most suitable to afford the minimum sol fraction and the highest yield product at a minimal irradiation dose of 10 kGy. It was observed that NVP hydrogel displayed the highest swelling in water, alcohols, and dimethyformamide of ϳ1300% and a lower tendency to swell in nonpolar solvents. The results showed that HEMA hydrogel has a high affinity to absorb basic dyes while NVP has a tendency for acid dyes. Also, the sorption of either the basic or acid dyes by the different hydrogels was found to greatly depend on the concentration of dye in solution and the mass of the used hydrogel.

Synthesis and characterization of hydroxyethyl methacrylate/acrylamide responsive hydrogels

“…It seems that the low dose of 10 kGy scarcely has effect on the conversion of hydrogel solution to complete hydrogels, particularly for those compositions containing a higher ratio of AM monomer. In a previous work18 on the synthesis of pure HEMA hydrogel, using water as a pure solvent and 0.05 wt/vol ratio of N,N ‐methylenebisacrylamide (MBAm) as a crosslinking agent followed by gamma irradiation to a dose of 10 kGy, a gel fraction of about 90% was obtained compared to 75.6%, as shown in Table I. Thus, it can be concluded that MBAm initiated the radiation crosslinking19 of pure HEMA rather than that of the TTGA compound at such a low dose.…”

“…In this regard, the radiation crosslinking and metal sorption of hydrogels based on poly(acrylic acid) with trithioglycolic acid or 2‐mercaptobenzimidazol were investigated 16, 17. Recently, radiation crosslinking and dye sorption of hydrogels, based on 1‐vinyl‐2‐pyrrolidone, hydroxyethyl methacrylate, and their copolymers, were investigated 18. Hydroxyethyl methacrylate (HEMA) and acrylamide (AM) are hydrophilic monomers containing hydroxyl and amide groups giving a unique combination of properties.…”

Gamma Ray Irradiation‐Initiated Copolymerization of a Binary Casting System Involving DPBMIn and Vinylpyrrolidone

“…From Table 1, it can be seen that with the increase of DPBMI 2 content, mechanical and thermal properties of copolymer resin increased, and its water uptake was inhibited. Polyvinylpyrrolidone (PVP) is a highly hydrophilic polymer, widely used in hydrogel and drug release 18–21. Compared with that of neat PVP, water uptake of copolymer resin was far smaller.…”