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Double Critical Phenomena in (Water + Polyacrylamides) Solutions
Rebelo, L. P. N.; Visak, Z. P.; Sousa, H. C. de; Szydlowski, J.; Azevedo, R. Gomes de; Ramos, A. M.; Najdanovic-Visak, V.; Ponte, M. Nunes da; Klein, J.Aqueous solutions of a copolymer derivative of a polyacrylamide showed very interesting behavior, that in which the system evolves from one kind of double criticality (pressure−hypercritical point) to another (temperature−hypercritical point) as polymer molecular weight decreases. While in the neighboring region of the former point one expects a change from contraction to expansion upon mixing with increasing p...
Phase behavior of (polyacrylamides + water) solutions: concentration, pressure ...
Azevedo, R. Gomes de; Rebelo, L. P. N.; Ramos, A. M.; Szydlowski, J.; Sousa, H. C. de; Klein, J.Phase diagrams of poly(N-isopropylacrylamide) (PNIPAAM) as well as of hydrophilically-modified copolymers in aqueous solution were determined. A high-accuracy He-Ne Laser scattering technique was used for the detection of operational spinodal (sp) and cloud-point (cp) curves. Polymer concentration was varied from 0.5 to 20 wt.%. In the case of copoly(PNIPAAM/vinylsaccharide) several different chain lengths were...
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