Hexavalent Chromium-Thioacetamide Redox System Initiated Polymerization of Acrylonitrile

Samal, Rajani K.; Dash, P. C.; Mishra, Brijesh Kumar; Suryanarayana, G. V.; Das, Dhanjit Kumar; Nayak, M. C.

doi:10.1080/00222338208063274

Cited by 5 publications

(1 citation statement)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Much attention has recently been focused on both homopolymerization and graft copolymerization of vinyl monomers by higher valence transition metal ions, including Ce(IV), Mn(III),12 V(V),13 Cr(VI),14 Co(III),15, 16 etc. Of these metal oxidants, ceric(IV)ions were employed the most extensively because they lead to a higher extent of grafting.…”

Section: Introductionmentioning

confidence: 99%

Graft copolymerization of methyl acrylate onto cellulose initiated by potassium ditelluratoargentate(III)

Liu¹,

Yang²,

Shi³

et al. 2004

Polymer International

View full text Add to dashboard Cite

A novel redox system, potassium ditelluratoargentate(III) (DTA)-cellulose, was employed to initiate the graft copolymerization of methyl acrylate onto cellulose in alkali aqueous solution. Grafting parameters, such as total conversion, grafting efficiency and grafting yield, were evaluated comparatively. The dependence of these parameters on temperature, reaction time, initiator concentration and ratio of monomer to cellulose was also investigated. Graft copolymers with high grafting parameters were obtained, which indicated that the DTA-cellulose redox pair is an efficient initiator for cellulose grafting. The proof of grafting was obtained from gravimetric analysis and infrared spectra. A tentative mechanism involving a two-step single-electron-transfer process of DTA is proposed to explain the generation of radicals and initiation. Thermogravimetry, X-ray diffraction and scanning electron microscopy were also carried out to study the thermal stability, crystallinity and morphology of the grafted copolymers.

show abstract

Section: Introductionmentioning

confidence: 99%

Graft copolymerization of methyl acrylate onto cellulose initiated by potassium ditelluratoargentate(III)

Liu¹,

Yang²,

Shi³

et al. 2004

Polymer International

View full text Add to dashboard Cite

show abstract

Redox polymerization process: An efficient tool for the synthesis of block copolymers

Nagarajan

Srinivasan

1995

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

The synthesis of poly(acrylonitrile)‐block‐poly‐(ethylene glycol)‐block‐poly(acrylonitrile) copolymers has been carried out using a redox system consisting of ceric ion and poly(ethylene glycol)s of various molecular weights in aqueous medium. The generation of intermediate radicals in the redox process has been confirmed by ESR spectroscopy and the polymerization progressing through ‘blocking from’ mechanism has been postulated. The formation of the block copolymers has been confirmed by chemical tests and fractional precipitation technique as well as by FT‐IR and FT‐NMR [1H and 13C–(1H)] spectroscopic techniques. The triblock nature of the block copolymers has been ascertained through the cleavage of ether linkage of the PEG segment. TG/DTA studies of the block copolymers with PEG molecular weights of 1000 and above revealed two‐stage decomposition, while their DSC traces exhibited a shift in the melting peak of PEG. GPC investigations of the block copolymers manifested a high homogeneity with unimodal distribution of molecular weights. SEM studies indicated significant changes in the morphological characteristics of the block copolymers. © 1995 John Wiley & Sons, Inc.

show abstract

Aqueous polymerization of acrylamide initiated by cerium(IV)-nitrilotriacetic acid redox initiator

Hsu

Chen

Kuo

et al. 1994

Polymer

View full text Add to dashboard Cite

Hexavalent Chromium-Thioacetamide Redox System Initiated Polymerization of Acrylonitrile

Cited by 5 publications

References 25 publications

Graft copolymerization of methyl acrylate onto cellulose initiated by potassium ditelluratoargentate(III)

Graft copolymerization of methyl acrylate onto cellulose initiated by potassium ditelluratoargentate(III)

Redox polymerization process: An efficient tool for the synthesis of block copolymers

Aqueous polymerization of acrylamide initiated by cerium(IV)-nitrilotriacetic acid redox initiator

Contact Info

Product

Resources

About