Synthesis of phosphonated comb-like copolymers and evaluation of their dispersion efficiency on CaCO3 suspensions part II: Effect of macromolecular structure and ionic strength

The aim of this paper is to investigate effects of macromolecular structure and ionic competition phenomena induced by an increase of ionic strength on the dispersive action of new superplasticizers. These superplasticizers were synthesized and their structure is based on that of polycarboxylates. T...

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Bibliographic Details
Published in:Powder technology 2018-07, Vol.334, p.163-172
Main Authors: Tramaux, A., Azéma, N., El Bitouri, Y., David, G., Negrell, C., Poulesquen, A., Haas, J., Remond, S.
Format: Article
Language:English
Subjects:
Adsorption
Calcite suspension
Chemical Sciences
Dispersion
Ionic competition
Macromolecular structure
Organic chemistry
Superplasticizers
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Summary:The aim of this paper is to investigate effects of macromolecular structure and ionic competition phenomena induced by an increase of ionic strength on the dispersive action of new superplasticizers. These superplasticizers were synthesized and their structure is based on that of polycarboxylates. These superplasticizers are comb-like copolymers with phosphonic acids. Macromolecular parameters studied are the monomer repartition along the carbon backbone and the chain length. Ionic strength is increased either by adding sulfate or nitrate ions. The effects of these factors are then investigated using adsorption, stability and rheology results. It appears that statistical copolymers with phosphonic acids having the shortest chain length are the most efficient in terms of fluidity improvement even in the presence of sulfate or nitrate ions. [Display omitted] •Synthesis of seven macromolecules structures which includes phosphonic acids•Comparison between block and statistical copolymers with different DPn•Use Stability Index to characterize gain in suspension stability•Study of ionic competition resistance
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2018.04.020