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Copolymers of N-vinyl-2-pyrrolidone and 2-(dimethylamino)ethyl methacrylate, 2. Quaternization with octyl bromide — kinetic studies

✍ Scribed by Karine Deboudt; Michèle Delporte; Claude Loucheux

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
491 KB
Volume
196
Category
Article
ISSN
1022-1352

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✦ Synopsis

N-Vinyl-2-pyrrolidone -2-(dimethy1amino)

ethyl methacrylate copolymers were quaternized with octyl bromide in tetramethylene sulfone. The quaternization kinetics was studied, varying the concentrations of reagents and the composition of copolymers. The initial rate constant is not disturbed by the concentration of reagents, but it is by the initial copolymer composition: the higher the initial octyl bromide concentration, the higher the maximal conversion rate. These kinetic results were interpreted, observing the influence of the steric effect, the electrostatic effect and the effect of solvation. The kinetic models proposed in the literature were applied to our data and discussed. None of them describes perfectly the behaviour of our system.

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## Abstract Copolymers of __N__‐vinyl‐2‐pyrrolidone (V) and glycidyl methacrylate (G) monomers of different compositions were prepared by free‐radical solution polymerization. The copolymer composition of these copolymers was determined with ^1^H‐NMR spectra. The reactivity ratios calculated from t