Graft copolymerization of 2‐acrylamido‐2‐methyl‐1‐propanesulphonic acid onto carboxymethylcellulose (sodium salt) using bromate/thiourea redox pair

Abstract

Unreported graft copolymer of 2-acrylamido-2-methyl-1-propanesulphonic acid (AMPS) with sodium carboxymethylcellulose (Na-CMC) was synthesized and reaction conditions were optimized using a bromate/ thiourea redox pair under an inert atmosphere at 40°C. Grafting ratio, add on, and conversion increase as the concentration of thiourea and [H ϩ ] increases up to 3.6 ϫ 10 Ϫ3and 0.6 ϫ 10 Ϫ2 mol dm Ϫ3, respectively, while on increasing the concentration of bromate ion and Na-CMC, grafting ratio, add on, and conversion decrease. The samples of Na-CMC and grafted Na-CMC with AMPS were subjected to thermogravimetric analysis, with the objective of studying the effect of grafting of AMPS on the thermal stability of graft copolymer. The graft copolymer was found to be more thermally stable than pure Na-CMC. Comparing the IR spectra of pure with grafted Na-CMC confirm the evidence of grafting.

Graft copolymerization of N‐vinyl‐2‐pyrrolidone onto sodium carboxymethylcellulose with azobisisobutyronitrile as the initiator

“…Moreover, a high NaCMC concentration could produce more NaCMC macroradicals, which could interact with one another to terminate the reaction, thus lowering both the GY and GE values. Similar findings were reported by Banerjee et al 27 They grafted 2-acrylamido-2-methyl-1-propanesulfonic acid onto NaCMC with a bromate/ thioure redox pair and observed the same trend concerning the NaCMC concentration. Similar results can also be found in the literature.…”

Influence of grafting conditions on the properties of polyacrylamide-based cation-exchange cryogels grafted with 2-acrylamido-2-methyl-1-propanesulfonic acid

“…As can be seen, the protein binding capacity increases with the graft reaction time up to 4.5 h and thereafter decreases slightly. The increase trend may be attributed to the addition of the graft monomer molecules to the growing polymer chains, as similar as those in other graft polymerization experiments (Banerjee et al, 2006), and also indicates that Cu(III) could keep its activity for a period of time. Within the time, active sites were formed on the pAAm cryogel backbone.…”

“…(1) almost consume out of Cu(III) after 4.5 h and a decrease in the number of sites available for graft, (2) a decrease in the monomer and initiator concentrations, and the retardation of diffusion after some polymers formed on the pAAm cryogel surface and (3) by Liu et al (2003), Abu-llaiwi et al (2004) and Banerjee et al (2006). From Figs.7 and 8, we can find that under the various graft reaction time, the protein binding capacity of the grafted cryogel reaches its highest when the graft time is 4.5 h, and the value of HETP after graft polymerization is similar with that before graft polymerization.…”

Synthesis and Some Physico‐Chemical Properties of Novel Starch‐g‐poly(citronellyl acrylate) Copolymers

“…The copolymers of carbohydrate polymers, e.g., starch, cellulose, dextran, carboxymethylcellulose, lignocellulose, alginate, chitosan, etc. and various structure vinyl monomers, e.g., styrene, methacrylates, acrylates can be synthesized . In addition, the graft copolymers of synthetic polymers such as (poly(chloroethyl vinyl ether)‐g‐polystyrene)comb‐b‐(poly(chloropyran ethoxy vinyl ether)‐g‐polyisoprene)comb, (meth)acrylate copolymer grafted with long fluorinated side chain, Nylon 6‐g‐poly(acrylic acid), polyethylene‐g‐poly(acrylic acid), polyaniline‐g‐(sulfonated polyurethane), poly(N‐vinylpyrrolidinone‐g‐styrene), etc.…”