Graft copolymerization in aqueous isopropanol of methyl methacrylate on plantain pulp modified with allyl chloride

Okieimen, F. E.; Uroghide, I.N.; Oriakhi, Christopher O.

doi:10.1016/0014-3057(90)90194-9

Cited by 4 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The highest graft level (403.80%) and grafting efficiency (64.88%) were obtained at a ceric ion concentration of 10 mmol −1 , and this corresponds with the lowest level of homopolymer formation (35.12%). A decrease in the level of grafting was observed with a further increase in the ceric ion concentration, which is consistent with the results of previous studies, both in our laboratories18–22, 32, 33 and elsewhere 38–41. When it was thought that propagation by radicals formed on the backbone polymer was the main route to graft polymer formation, the ceric ion concentration at which maximum graft levels is attained was considered to correspond to the reductive equivalent of the backbone polymer 20.…”

Section: Resultssupporting

confidence: 91%

See 1 more Smart Citation

Preparation, characterization, and properties of cellulose–polyacrylamide graft copolymers

Okieimen¹

2003

J of Applied Polymer Sci

View full text Add to dashboard Cite

Graft copolymers of acrylamide on cellulose materials (␣-cellulose 55.8%, DP 287.3) obtained from Terminalia superba wood meal and its carboxymethylated derivative (DS 0.438) were prepared using a ceric ion initiator and batch polymerization and modified batch polymerization processes. The extent of graft polymer formation was measured in graft level, grafting efficiency, molecular weight of grafted polymer chains, frequency of grafting as a function of the polymerization medium, and initiator and monomer concentrations. It was found that the modified batch polymerization process yielded greater graft polymer formation and that graft copolymerization in aqueous alcohol medium resulted in enhanced levels of grafting and formation of many short grafted polymer chains. Viscosity measurements in aqueous solutions of carboxymethyl cellulose-g-polyacrylamide copolymer samples showed that interpositioning of polyacrylamide chains markedly increased the specific viscosity and resistance to biodegradation of the graft copolymers. The flocculation characteristics of the graft copolymers were determined with kaolin suspension.

show abstract

Section: Resultssupporting

confidence: 91%

“…The results in Table II show that the amount of polyacrylamide added to the backbone polymer was higher in the aqueous alcohol mixtures than in the single solvents. Enhanced grafting in aqueous alcohol mixtures has been explained in terms of the following reaction sequence 17, 18, 30, 31…”

Section: Resultsmentioning

confidence: 99%