Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/15557
Title: Flocculation by Cationic Polyelectrolytes: Relating Efficiency with Polyelectrolyte Characteristics
Authors: Rasteiro, M. G. 
Garcia, F. A. P. 
Ferreira, P. J. 
Antunes, E. 
Hunkeler, D. 
Wandrey, C. 
Keywords: Copolymerization; Water-soluble polymers; Polyelectrolytes; Flocculation; Laser diffraction (LDS)
Issue Date: Feb-2010
Publisher: Wiley-Blackwell
Citation: RASTEIRO, M. G.; GARCIA, F. A. P.; FERREIRA, P. J.; ANTUNES, E.; HUNKELER, D.; WANDREY, C. - Flocculation by cationic polyelectrolytes: relating efficiency with polyelectrolyte characteristics. Journal of Applied Polymer Science. ISSN 1097-4628. 116 (2010) 3603-3612. Disponível na WWW: http://hdl.handle.net/10316/15557
Serial title, monograph or event: Journal of Applied Polymer Science
Volume: 116
Abstract: A series of acrylamide/dimethylaminoethylacrylate methyl chloride copolymers (AM-co-DMAEA) was evaluated as flocculants for model Precipitated Calcium Carbonate (PCC) in distilled water. These cationic polyelectrolytes (PEL) differed by their AM/DMAEA ratio, i.e., their charge density, chain architecture (linear and branched), their intrinsic viscosity (IV), and zeta potential of their aqueous solutions. The IV being directly related to the hydrodynamic volume of the PEL and the zeta potential reflecting the effective charge in suspension were selected for practically useful correlations with flocculation performance. The fractal dimension (dF) and the scattering exponent (SE) of the flocs, analyzed by the laser diffraction method, were taken as indication of primary particle and aggregate assembly. For the optimum PEL dosage, SE and dF varied with the IV and zeta potential. It was observable that floc size, floc resistance, and floc reorganization correlate with the PEL characteristics. Copolymers with lower IV, which is here associated with PEL of similar molar mass but lower charge density, yielded larger and less resistant flocs. Copolymers with higher IV originated smaller more compact flocs being more resistant. In high shear situations, where floc breakage should be avoided, as it is the case in papermaking, polymers with high IV yielding large SE are advantageous.
URI: http://hdl.handle.net/10316/15557
ISSN: 0021-8995
Rights: closedAccess
Appears in Collections:FCTUC Eng.Química - Artigos em Revistas Internacionais

Files in This Item:
File Description SizeFormat Login
PJF - AppPolSci - 2010.pdf364.27 kBAdobe PDF    Request a copy
Show full item record

Page view(s)

110
checked on Aug 6, 2020

Download(s) 50

273
checked on Aug 6, 2020

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.