Grafting ofN,N′-methylenebisacrylamide onto cellulose using Co(III)-acetylacetonate complex in aqueous medium

Abstract

ABSTRACT:The grafting of N,NЈ-methylenebisacrylamide (N,NЈ-MBA) onto cellulose is carried out using the cobaltacetylacetonate complex (Co(acac) 3 ) under nitrogen atmosphere at 40°C. The rate of graft copolymerization has been studied as a function of [N,NЈ-MBA], [Co(acac) 3 ], and temperature. The activation energy of grafting is found to be 156.0 k J mol Ϫ1 within the temperature range of 30 -60°C. The effect of perchloric acid, methanol, and surfactants on graft yield has also been studied and results are suitably explained. The higher efficiency of the metal chelate in initiation of graft copolymerization has been assumed due to the coordination of the electrons of the N,NЈ-MBA with the metal chelate, which facilitated the formation of the radicals through homolytic cleavage of metal-oxygen bond of the cobalt acetylacetonate complex. On the basis of the results, a suitable kinetic scheme for graft copolymerization is presented and rate expression is derived.

Characterization and thermal stability of cellulose‐graft‐polyacryloniytrile prepared by using KMnO4/citric acid redox system

“…Cellulose is one of the most popular natural polymers, which has been widely used in industries and daily lives. To further expand the industrial applications of the cellulose, modification methods of physical and chemical properties of the cellulose have been continuously studied to investigate the required properties 1–5. Graft copolymerization of vinyl polymers onto cellulose is one of the most extensively studied procedures.…”

Encapsulation of silica nanoparticles by redox-initiated graft polymerization from the surface of silica nanoparticles

“…Different from some other metal ions used for initiating graft polymerizations, such as Co 3+ [30], [31], Ce 4+ ions introduce active sites to reductants by a single electron-transfer process and the formation of homopolymer is prevented. Ce 4+ initiated grafting polymerization has been successfully employed to prepare polymer brushes on flat substrates [32].…”

Graft copolymerization of acrylamide–methylacrylate comonomers onto cellulose using ceric ammonium nitrate

“…A considerable number of studies on graft copolymerization of single monomers onto cellulose using different methods of initiation has been reported. [1][2][3][4][5] But graft copolymerization of binary mixtures of vinyl monomers has special importance in comparison to simple grafting of individual monomers. This technique of grafting of monomer mixtures has the advantage of creating grafted chains with tailor-made properties for specific applications.…”