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Polyacrylamide gels. Process of network formation

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1989-01
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Baselga Llidó, Juan
Llorente Muga, Amaia
Hernández-Fuentes, I.
Fernández de Piérola, Inés
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Pergamon Press
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This paper refers to the crosslinking copolymerization of acrylamide (AA or monomer-1) and N,N′-methylene-bisacrylamide (BA or monomer-2) in aqueous solution at 22°, covering a broad range of comonomer concentrations. The extent of reaction, pT, the composition of the remaining comonomer mixture, f₂, and the copolymer composition, F₂, have been determined by high resolution 1H-NMR with polymerization in situ. The non-linear regression fit of f₂ as a function of pT yields almost the same values for the reactivity ratios for any of the studied comonomers feeds. The instant copolymer composition changes with the copolymerization time due to a shift in the residual comonomer composition and, to a smaller extent, to changes in the comonomer relative reactivities. This effect contributes to the heterogeneity of the final network.
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J. Baselga, M. A. Llorente, J. L. Nieto, I. Hernández-Fuentes, I. F. Piérola (1989). Polyacrylamide gels. Process of network formation. European Polymer Journal, 25 (5), pp. 477-480.