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Graft copolymerization of acrylic acid onto methylcellulose by potassium permanganate‐p‐xylene redox pair
Author(s) -
Eromosele C. O.,
Nwokata S. P.
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.12957
Subject(s) - potassium permanganate , acrylic acid , copolymer , redox , polymer chemistry , chemistry , xylene , yield (engineering) , aqueous solution , polymerization , activation energy , permanganate , materials science , toluene , inorganic chemistry , organic chemistry , metallurgy , polymer
Poly(acrylic acid) was grafted onto methylcellulose in aqueous media by a potassium permanganate‐p‐xylene redox pair. Within the concentration range from 0.93 × 10 −3 to 9.33 × 10 −3 M , p‐xylene, the graft copolymerization reaction exhibited minimum and maximum graft yields and was associated with two precursor‐initiating species, a p‐xylyl radical and its diradical derivative. The efficiency of the graft was low, not higher than 12.9% at a p‐xylene concentration of 0.93 × 10 −3 M and suggested the dominance of a competitive homopolymerization reaction under homogeneous conditions. The effect of permanganate on the graft yield was normal and optimal at 135% graft yield, corresponding to a concentration of the latter of 33.3 × 10 −3 M over the range from 8.3 × 10 −3 to 66.7 × 10 −3 M . The conversion in graft yield showed a negative dependence on temperature in the range 30–60°C and suggested a preponderance of high activation energy transfer reaction processes. The calculated composite activation energy for the graft copolymerization was 7.6 kcal/mol. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 278–281, 2004