Citation:
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.
Sponsor:
Financial support from CAICYT (Spain) under Grants No. GG85/0013 and PA86/0370 is gratefully acknowledged. We are also indebted to Dr R. Gonzalez Rubio for his computer assistance, and to Dr J. Guzman for sorne interesting comments.
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 compositioThis 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.[+][-]