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Grafting vinyl monomers onto silk fibers. VIII. Graft copolymerization of methyl methacrylate onto silk using tetravalent manganese–oxalic acid redox system
Author(s) -
Panda Gadadhar,
Pati Nrusingha C.,
Nayak Padma L.
Publication year - 1980
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.1980.070250721
Subject(s) - oxalic acid , monomer , grafting , copolymer , polymer chemistry , redox , yield (engineering) , chemistry , methyl methacrylate , silk , sulfuric acid , aqueous solution , manganese , nuclear chemistry , materials science , inorganic chemistry , organic chemistry , polymer , metallurgy , composite material
The graft copolymerization of methyl methacrylate onto silk fibers was investigated in aqueous solution using the Mn(IV)–oxalic acid redox system. The copolymerization reaction was carried out under a variety of conditions such as different monomer, initiator, oxalic acid, acid concentrations, and temperatures. The graft yield increases with increasing initiator concentration up to 5 × 10 −2 M , and with further increase of the initiator concentration it decreases. The graft yield also increases with increasing sulfuric acid concentration up to 15 × 10 −2 M , and decreases thereafter. The rate of grafting also increases with increase in oxalic acid concentration up to 1.5 × 10 −2 M and 84.592 × 10 −2 M , respectively, and thereafter the rate of grafting shows down. The effect of temperature, solvents, and salts on graft yield has also been investigated and a plausible rate expression has been derived.