Baselga Llidó, JuanLlorente Muga, AmaiaHernández-Fuentes, I.Fernández de Piérola, Inés2017-11-092017-11-091989-01J. 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. 477-480.0014-3057https://hdl.handle.net/10016/25786This 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.4application/pdfeng© Pergamon Press, 1989 © ElsevierAtribución-NoComercial-SinDerivadas 3.0 Españaresearch articleMaterialesQuímicahttps://dx.doi.org/10.1016/0014-3057(89)90189-4open access4775480European Polymer Journal25AR/0000010930