Document Detail

PAA-PAMPS Copolymers as an Efficient Tool to Control CaCO3 Scale Formation.
MedLine Citation:
PMID:  23387936     Owner:  NLM     Status:  Publisher    
Scale formation, the deposition of certain minerals such as CaCO3, MgCO3 and CaSO4 x 2H2O in industrial facilities and household devices, leads to reduced efficiency or severe damages. Therefore, incrustation is a major problem in everyday life. In recent years, double hydrophilic block copolymers (DHBC) have been in the focus of interest in academia with regards to their anti-scaling potential. In this work, we synthesized well-defined block-like PAA-PAMPS copolymers consisting of acrylic acid (AA) and 2-acrylamido-2-methyl-propane sulfonate (AMPS) units in a one-step reaction by RAFT polymerization. The derived copolymers had dispersities of 1.3 and below. The copolymers have then been investigated in detail regarding their impact on the different stages of the crystallization process of CaCO3. Ca2+ complexation, the first step of a precipitation process, and polyelectrolyte stability in aqueous solution have been investigated by potentiometric measurements, isothermal titration calorimetry (ITC) and dynamic light scattering (DLS). A weak Ca2+ induced copolymer aggregation without concomitant precipitation was observed. Nucleation, early particle growth and colloidal stability have been monitored in situ with DLS. The copolymers retard or even completely suppress nucleation, most probably by complexation of solution aggregates. In addition, they stabilize existing CaCO3 particles in the nanometer regime. In situ AFM was used as a tool to verify the coordination of the copolymer to the calcite (104) crystal surface and to estimate its potential as a growth inhibitor in a supersaturated CaCO3 environment. All investigated copolymers instantly stopped further crystal growth. The carboxylate richest copolymer as the most promising anti-scaling candidate proved its enormous potential in scale inhibition as well in an industrial-filming test (Fresenius standard method).
Michael Dietzsch; Matthias Barz; Timo Schüler; Stefanie Klassen; Martin Schreiber; Moritz Susewind; Niklas Loges; Michael Lang; Nadja Hellmann; Monika Fritz; Karl Fischer; Patrick Theato; Angelika Kuhnle; Manfred Schmidt; Rudolf Zentel; Wolfgang Tremel
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-2-7
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-2-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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