RT Journal Article
T1 Polyacrylamide gels. Process of network formation
A1 Baselga Llidó, Juan
A1 Llorente Muga, Amaia
A1 Hernández-Fuentes, I.
A1 Fernández de Piérola, Inés
AB 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.
PB Pergamon Press
SN 0014-3057
YR 1989
FD 1989-01
LK https://hdl.handle.net/10016/25786
UL https://hdl.handle.net/10016/25786
LA eng
NO 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.
DS e-Archivo
RD 27 jul. 2024