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In Situ Rheological Monitoring The Sol – Gel Transition for Polyacrylamide Gel

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Nita L.E., Chiriac A., Bercea M., Neamtu I

Editorial: H.H. Winter; D. Vlassopoulos, Springer, Rheologica Acta, 46, p.595-600, 2007.


The effects of heating rate and shear stress on the sol-gel transition for a polyacrylamide gel during in situ preparation were investigated by dynamic rheology. The gelation evolution was also studied through monitoring of
the static gelation process by means of temperature, pH, and conductivity variation. The gels were prepared by
polymerization of acrylamide crosslinked with N,N′-methylenebisacrylamide
using a redox initiation based on
potassium persulfate/ascorbic acid. In situ gelation process was studied using oscillatory deformation tests at constant frequency of 0.1 Hz for different heating rate (from 0.5 to
5 °C/min) and shear stress (in the range of 0.1 to 10 Pa).

Cuvinte cheie: Rheology, Poly(acrylamide), Gel