NDLI: Graft copolymerization of 4-vinylpyridine onto cellulose using Co (III) acetylacetonate comlex in aqueous medium

Content Provider	Springer Nature Link
Author	Gupta, K.C. Sahoo, Sujata
Copyright Year	2001
Abstract	The graft copolymerization of 4-vinylpyridine (4-VP) onto cellulose has been carried out in heterogeneous conditions with cobaltacetylacetonate complex (Co (acac)3) under nitrogen atmosphere at 35±0.1°C in aqueous media. The grafting parameters such as graft yield, grafting efficiency, total conversion, frequency of grafting and rate of grafting have been evaluated as a function of concentration of 4-vinylpyridine, cobaltacetylacetonate and reaction temperature of graft copolymerization. Variation in concentration of monomer and initiator leads to a consistent increase in grafting parameters and then show a decreasing trend. The efficient grafting of monomer in presence of cobaltacetylacetonate complex is due to the coordination of the π-electrons of the 4-vinylpyridine with the metal chelate which facilitate the homolytic decomposition of metal-oxygen bond to form radicals at relatively low temperature. The rate of graft copolymerization is directly proportional to the concentration of monomer and the square root of the concentration of the cobaltacetylacetonate complex. The activation energy (ΔEa) for graft copolymeriztion has been calculated using a Arrhenius plot and is 31.0kJ mol−1 within the temperature range of 20–40°C. The grafting of 4-vinylpyridine has also been studied in presence of various additives and their effects have been suitably explained. On the basis of the experimental observations, reaction steps are proposed and rate expression has been derived.
Starting Page	233
Ending Page	242
Page Count	10
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	8
Issue Number	3
e-ISSN	1572882X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Organic Chemistry Physical Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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