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Inhibition of homogenous formation of calcium carbonate by poly (acrylic acid). The effect of molar mass and end-group functionality

Authors
Journal
Desalination
0011-9164
Publisher
Elsevier
Publication Date
Volume
338
Identifiers
DOI: 10.1016/j.desal.2014.01.020
Keywords
  • Crystallization
  • Calcium Carbonate
  • Polyelectrolytes
  • Scale Inhibitor
  • Sem (Scanning Electron Microscopy)
  • Xrd (X-Ray Diffraction)
  • Poly(Acrylic Acid)
  • Atrp (Atom Transfer Radical Polymerization)
Disciplines
  • Physics

Abstract

Abstract The ability of poly(acrylic acid) (PAA) with different end groups and molar masses prepared by Atom Transfer Radical Polymerization (ATRP) to inhibit the formation of calcium carbonate scale at low and elevated temperatures was investigated. Inhibition of CaCO3 deposition was affected by the hydrophobicity of the end groups of PAA, with the greatest inhibition seen for PAA with hydrophobic end groups of moderate size (6–10 carbons). The morphologies of CaCO3 crystals were significantly distorted in the presence of these PAAs. The smallest morphological change was in the presence of PAA with long hydrophobic end groups (16 carbons) and the relative inhibition observed for all species were in the same order at 30°C and 100°C. As well as distorting morphologies, the scale inhibitors appeared to stabilize the less thermodynamically favorable polymorph, vaterite, to a degree proportional to their ability to inhibit precipitation.

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