Rheological Monitoring of Polyacrylamide Gelation
Request PDF | Rheological Monitoring of Polyacrylamide Gelation: Importance of Cross-Link Density and Temperature | Dynamic shear oscillation measurements at small strains are used to characterize
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
Rheological Monitoring of Polyacrylamide Gelation
Rheological Monitoring of Polyacrylamide Gelation: Importance of Cross-Link Density and Temperature. Rheological Monitoring of Polyacrylamide Gelation: Importance of Cross-Link Density and Temperature. Damien Calvet,†Joyce Y. Wong,‡and Suzanne Giasson*,†.
Rheological Monitoring of Polyacrylamide Gelation: Importance of Cross-Link Density and Temperature
Rheological Monitoring of the Formation of Polyacrylamide
The formation of polyacrylamide/chromium-ion gels has been followed rheologically. The time dependence of the storage modulus has been used to analyze the kinetics of the gelation process. The kinetic theory of rubber elasticity has been used to determine the crosslink density in the gel from the measured value of the storage modulus.
In conclusion, the rheological and mechanical characterization illustrated in this study allows a better understanding of the relationships between the rheological behavior and the functional properties of these polyacrylamide-based systems and provides useful guidelines to design and fabricate hydrogels with improved resolution for both small and large proteins in 2-D gel electrophoresis.
Synthesis, characterization and rheological behavior of pH
Poly(acrylic acid), was chosen as a thickener to study the rheological behavior of copolymer hydrogels, PAAc polymers as an anionic hydrogel are widely used to improve the rheological properties of thickening systems.
Bulk and rheological properties of hydrogels 533 Korean J. Chem. Eng.(Vol. 31, No. 3) ing the gelation time, gel strength and thermal stability, visually. Hy-drogels were prepared by using a low MW copolymer of sulfonated polyacrylamide and chromium triacetate as a crosslinker. As the bottle test method would not be a suitable way to select a
Thermoset Characterization Part 4: Introduction to Gelation
Molecular gelation may be detected as the point at which the reacting resin just becomes insoluble, or as the point where the mechanical loss tangent becomes frequency independent (4,5). Macroscopic means to approximate gelation include the time to reach a specific viscosity and the G’ = G” crossover in a dynamic rheology measurement.
Polyacrylamide gels were made as described and 250 µl of solution was used with a 770 µm gap. A solvent trap was used for all experiments to minimize evaporation. The gelation properties of the polyacrylamide gels were monitored over 45 minutes using an oscillatory stress of 10 Pa and a frequency of 1 Hz.
Study the Rheological Behaviour and Effectiveness
hydrolyzed polyacrylamide (PHPA) polymer and zirconium acetate gel system [2, 3, 7]. However, these investigators did not perform rheological behavior, in-situ gelation and conduct sand pack flooding experiments for the effectiveness of the partially-hydrolyzed polyacrylamide (PHPA) polymer and zirconium acetate gel system.
high temperatures to induce gelation. Therefore, it is important to explore the rheology of proteins for better understanding of gelation behavior. Received 2 July 2008; accepted 11 July 2009. Address correspondence to Xiao-Quan Yang, Department of Food Science and Technology, South China University of Technology, Guangzhou 510640, P.R. China.
