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Degradation of aqueous poly(vinylpyrrolidone) solution by high‐speed stirring
Author(s) -
Nakano Akihiko,
Minoura Yuji
Publication year - 1977
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.1977.070211103
Subject(s) - aqueous solution , n vinylpyrrolidone , polymer , chemistry , polymer chemistry , polymerization , intrinsic viscosity , degradation (telecommunications) , methyl orange , bond cleavage , reaction rate constant , limiting , kinetics , viscosity , chemical engineering , materials science , organic chemistry , copolymer , composite material , catalysis , telecommunications , physics , photocatalysis , quantum mechanics , computer science , mechanical engineering , engineering
The effect of concentration on scission of poly(vinylpyrrolidone) ( p v = 6,700) in aqueous solution by high‐speed stirring at a speed of 30,000 rpm at 30°C was investigated. Concentration was varied from 0.04 to 2% g/ml. Polymer chains were ruptured to lower molecular weights with decreasing concentration. The rate constant of scission, k , and the limiting degree of polymerization, P l , in Ovenall's equation calculated for the results were considerably changed in the polymer concentration range from 0.2 to 1% g/ml. The effect of addition of methyl orange on polymer scission was then studied, because the dye had been reported to increase the viscosity of aqueous poly(vinylpyrrolidone) solution because of unfolding of the macromolecule chains. However, no significant effect was found in the concentration range from 0.034 to 0.34 in the molar ratio of methyl orange to poly(vinylpyrrolidone).