Graft Copolymerization of Acrylic Acid onto Cocoyam Starch by Ceric Ion in the Presence of N,N0-Dimethylacetamide

I. C. Eromosele (Lead / Corresponding author), C. O. Eromosele, K. S. Ayinde, Oluwasesan Adegoke

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Grafting of acrylic acid onto cocoyam starch, Xanthosoma sagittitolium was initiated by ceric ion—N,N0-dimethylacetamide redox pair in aqueous media. The reaction was characterized by high graft yields of up to 676%, and infrared spectroscopy affirmed the presence of grafted polymer. Graft yield was enhanced by N,N0-dimethylacetamide (DMAc) in the concentration range, 9.0–36.0 3 1024M but lower concentrations were more favorable with the ratio of percentage graft, Pg/Pg0, in the presence and absence of DMAc respectively, of up to 1.34 at 9.0 3 1024M of the latter. Ceric ion was nonterminating of the graft reaction and a 10-fold increase in its concentration of 4.16 3 1023M resulted in high efficiency of graft of 50.2% in monomer conversion to grafted polymer. Enhanced homopolymer formation and low efficiency of graft were observed at monomer concentration greater than 0.69M. Long reaction time, greater than 30 min, was unfavorable to the graft reaction and the latter showed negative dependence on temperature in the range, 30–508C. At 30-min reaction time, the graft yield at 508C was not more than 70% of the corresponding value at 308C.
Original languageEnglish
Pages (from-to)2676-2680
Number of pages5
JournalJournal of Applied Polymer Science
Volume110
Issue number5
Early online date26 Aug 2008
DOIs
Publication statusPublished - 5 Dec 2008

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