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Effect of stirring on cellulose graft copolymerization. V. Influence of reaction parameters
Author(s) -
Graczyk Tomasz,
Hornof Vladimir
Publication year - 1985
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.1985.070301018
Subject(s) - agitator , copolymer , polymer chemistry , monomer , polymer , cellulose , polymerization , acrylamide , chemical engineering , materials science , dissolution , styrene , chemistry , organic chemistry , composite material , viscosity , engineering
Styrene was grafted onto dissolving pulp by the cellulose xanthate–Fe 2+ –H 2 O 2 system. Reaction parameters were found to have strong influence on conversion to both copolymer and total polymer, as well as on the dependence of polymerization on stirring. The formation of polymer was almost completely inhibited by pure oxygen, while air only slowed down the reaction. Under inert atmosphere, the effect of agitator speed was found to be strongly dependent on monomer and substrate concentration as well as on the concentration of emulsifier. The location of the maximum on the conversion vs. agitator speed curve was strongly affected by the shape of the stirrer. The presence of emulsifier had a relatively small effect on copolymer formation in the case of acrylamide, a water‐soluble monomer. Also the effect of stirring was less marked in the case of acrylamide. In all the systems investigated, the conversion to copolymer and total polymer was found to drop rapidly above a certain limiting agitator speed. The latter was different and characteristic for each system. No polymer formation was observed beyond 1000 rpm regardless of all other reaction conditions.