Preferential mineralization of CaCO3 layers on polymer surfaces from CaCl2 and water-soluble carbonate salt solutions supersaturated by poly(acrylic acid)

2004 ◽  
Vol 91 (6) ◽  
pp. 3627-3634 ◽  
Author(s):  
Takashi Iwatsubo ◽  
Kimio Sumaru ◽  
Toshiyuki Kanamori ◽  
Tomohiko Yamaguchi ◽  
Toshio Sinbo
Keyword(s):  
Acrylic Acid ◽  
Water Soluble ◽  
Polymer Surfaces ◽  
Salt Solutions ◽  
Soluble Carbonate ◽  
Carbonate Salt ◽  
Poly Acrylic Acid

scholarly journals Antibacterial activity of chitosan and the interpolyelectrolyte complexes of poly(acrylic acid)-chitosan

2010 ◽  
Vol 53 (3) ◽  
pp. 623-628 ◽  
Author(s):  
Hortensia Ortega-Ortiz ◽  
Baltazar Gutiérrez-Rodríguez ◽  
Gregorio Cadenas-Pliego ◽  
Luis Ibarra Jimenez
Keyword(s):  
Antibacterial Activity ◽  
Acrylic Acid ◽  
Antimicrobial Agents ◽  
Water Soluble ◽  
Amino Groups ◽  
Molecular Weights ◽  
Carboxylic Acid Groups ◽  
Microbial Inhibition ◽  
Interpolyelectrolyte Complexes ◽  
Poly Acrylic Acid

The antimicrobial activity of chitosan and water soluble interpolyelectrolyte complexes of poly(acrylic acid)-chitosan was studied. Chitosans of two different molecular weights were tested at different concentration for 0.5 to 5 g·L-1 as antimicrobial agents against P. aeruginosa and P. oleovorans. In both cases, the best microbial inhibition was obtained with the concentration of 5 g·L-1. However, the interpolyelectrolyte complexes of poly(acrylic acid)-chitosan with composition φ =2 produced higher antibacterial activity than the two chitosans at the concentration of 0.5 g·L-1. The NPEC2 complex was more effective than chitosans. This could be attributed to the number of moles of the amino groups of chitosan and the carboxylic acid groups of the interpolyelectrolyte complexes poly(acrylic acid).

Water-Soluble Poly(2-cinnamoylethyl methacrylate)-block-poly(acrylic acid) Nanospheres as Traps for Perylene

Langmuir ◽  
1998 ◽  
Vol 14 (7) ◽  
pp. 1554-1559 ◽  
Author(s):  
Guochang Wang ◽  
Fred Henselwood ◽  
Guojun Liu
Keyword(s):  
Acrylic Acid ◽  
Water Soluble ◽  
Soluble Poly ◽  
Poly Acrylic Acid

Shear-induced changes in chain configuration of poly(acrylic acid) in dilute solution

1989 ◽  
Vol 47 ◽  
pp. 698-699
Author(s):  
J.P. Armistead ◽  
R.R. Price ◽  
O.-K. Kim ◽  
L.-S. Choi
Keyword(s):  
Acrylic Acid ◽  
Shear Flow ◽  
Drag Reduction ◽  
Fluorescence Probe ◽  
Water Soluble ◽  
Polymer Chains ◽  
Rotating Disc ◽  
Molecular Configuration ◽  
Flexible Polymer ◽  
Poly Acrylic Acid

Small amounts (less than 30 ppm) of polymer dissolved in solution may significantly reduce the work required to pump fluids through a pipe at a given rate. In other words, the drag of the solution along the pipe walls is reduced. Drag reduction by polymers has been well characterized, however the molecular origin of the phenomena is not fully understood. Polymers that exhibit drag reduction characteristics typically have high molecular weight, have predominantly linear, flexible chains, and have an expanded molecular configuration in solution.Work in this laboratory has focused on the drag reduction behavior of poly(acrylic acid), PAA, in recent years. This polymer is one of the most shear stable water-soluble polymers and due to the ionic groups in the polymer chain its conformation in solution changes with pH and ionic strength. In a recent work, PAA solutions of 18 ppm, pH=8.1, showed an initial drag reduction of over thirty-five percent in rotating disc experiments. Over four minutes of shearing the drag reduction decreased to ten percent. This was surprising because of the known shear stability of PAA. When the sheared solution was left undisturbed for two weeks, it did not recover its drag reduction performance. However, the addition of NaCl to the solution during the shearing immediately restored drag reduction to its initial level. It was hypothesized that the shear flow induced interchain association that was possibly stabilized by hydrogen bonding and that the addition of the NaCl caused dissociation and drag reduction recovery. In additional work, fluorescence probe studies showed that shear flow induced local chain rigidity in the originally flexible polymer chains. In this study, the drag reduction experiments were repeated and the configurations of the sheared and unsheared polymer chains were viewed using electron microscopy.

Effect of the Ion Strengths in Different Salt Solutions on the Absorbencies of Poly(acrylic acid-co-acrylamide) Superabsorbent by Inverse Suspension Polymerization

2012 ◽  
Vol 550-553 ◽  
pp. 711-715
Author(s):  
Jian Jun Xie ◽  
Qing Xin Yao ◽  
Nian Zeng ◽  
Chu Ding
Keyword(s):  
Acrylic Acid ◽  
Metal Cation ◽  
Suspension Polymerization ◽  
The Self ◽  
Salt Solutions ◽  
Swelling Properties ◽  
Anionic Group ◽  
Inverse Suspension Polymerization ◽  
The Relationship ◽  
Poly Acrylic Acid

The absorbencies of poly(acrylic acid-co-acrylamide) (PAAM) are measured for the ion strengths of the salt solutions using the self-made PAAM by inverse suspension polymerization. The effects of various salt solutions on the swelling properties were studied systemically, and the relationship between the absorbency (Q) of PAAM and the concentrations of different salt solutions(c) could be expressed as Q=kcn. The absorbencies of PAAM decrease obviously with the ion strengths (less than 0.03mol/kg) and had no great change when the ion strengths were higher than 0.03mol/kg for the same solution systems. The absorbency decreased with an increase in charge of the metal cation. The absorbencies of the PAAM in the sodium solutions with different anion decreased with an increase of the ion strengths. However, the absorbencies increased with the increase in charge of the anionic group and were in order PO43->CO32->Cl-.

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