Swelling behavior of poly(acrylamide)/clay nanocomposite
This unusual swelling behavior is observable only when the clay concentration in the hydrogel is above the overlap threshold c∗.
Increasing rheometer frequency during gelation retarded the sol–gel transition and decreased the ultimate elastic modulus. The equilibrium swelling ratio of the NC hydrogels in tap water decreased with increasing laponite content. The salt sensitivity of the NC gels in oil reservoir water slightly decreased with increasing laponite content.
Swelling behavior of polyacrylamide/laponite clay
In this study, an investigation is carried out on the influence of varying clay contents (25–43%), pH values (2–11 buffer solutions), heat treatment, temperatures (25–60 °C) and ionic strengths (saline solution, 10 −7 –0.1 M) on the water absorbency of polyacrylamide (PAAm)/laponite nanocomposite (NC) hydrogels in the absence of polyelectrolyte.
Request PDF | Swelling behavior of polyacrylamide/laponite clay nanocomposite hydrogels: pH-sensitive property | In this study, an investigation is carried out on the influence of varying clay
Rheological Behavior of Polyacrylamide/Laponite
Rheological investigation showed that the polyacrylamide and polyacrylamide/laponite suspensions displayed non-Newtonian behavior in almost the whole range of shear rate.
(2007). Preparation and Swelling Behavior of Partially Hydrolyzed Polyacrylamide Nanocomposite Hydrogels in Electrolyte Solutions. Journal of Macromolecular Science, Part B: Vol. 47, No. 1, pp. 98-108.
Poly(acrylamide/laponite) nanocomposite hydrogels
Super adsorbent polyacrylamide (PAAm)/nanoclay (laponite, Lap) hydrogels were prepared by in situ free radical polymerization of AAm in an aqueous solution with clay as a crosslinker. The swelling properties and water‐soluble cationic dye adsorption behaviors of the PAAm/laponite (PAAm/Lap) nanocomposite (NC) hydrogels were investigated.
investigated the equilibrium swelling behavior and the elastic properties of nanocomposite hydrogels based on polyacrylamide (PAAm), poly(N,N-dime-thylacrylamide) (PDMA), and poly(N-isopropylacry-lamide) (PNIPA) as the hydrophilic polymer compo-nent and Laponite XLS as the clay component. As will be seen later, the properties of the hydrogels
Superabsorbent polymeric materials. I. Swelling behaviors
Peng Li, Nam Hoon Kim, Siddaramaiah and Joong Hee Lee, Swelling behavior of polyacrylamide/laponite clay nanocomposite hydrogels: pH-sensitive property, Composites Part B: Engineering, 40, 4, (275), (2009).
The swelling ratio of NC membrane with 20% laponite slightly increased with an increase in temperature. Dynamic mechanical analysis showed the systematic increase in storage modulus with laponite content, which indicates the enhancement of mechanical property upon laponite addition.
Unusual swelling behavior of polymer–clay nanocomposite
With regard to NC gels, Can et al. 27 reported the abnormal swelling behavior of NC gels consisting of PNIPA or PDMAA and inorganic clay (Laponite XLS with a dispersing agent, pyrophosphate-Na
Poly(Acrylamide/Laponite) Nanocomposite Hydrogels: Swelling and Cationic Dye Adsorption Properties Article in Journal of Applied Polymer Science 111(4):1786 - 1798 · February 2009 with 257 Reads
