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Dispersion mechanisms of comb‐type superplasticizers containing grafted poly(ethylene oxide) chains
Author(s) -
Sakai Etsuo,
Kawakami Akira,
Daimon Masaki
Publication year - 2001
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200110)175:1<367::aid-masy367>3.0.co;2-9
Subject(s) - superplasticizer , polymer , adsorption , ethylene oxide , suspension (topology) , chemical engineering , dispersion (optics) , materials science , polymer adsorption , polymer chemistry , chemistry , copolymer , organic chemistry , composite material , compressive strength , mathematics , physics , optics , homotopy , pure mathematics , engineering
This paper discusses the influence of graft chain length and dosage of comb‐type superplasticizers on adsorption and dispersion mechanisms, and their subsequent effect on the fluidity of concentrated limestone suspensions. Contrary to the results obtained from interparticle potential calculations, the fluidity of concentrated suspension is improved by the use of comb‐type polymers having shorter grafted chain length. The dispersion mechanism of comb‐type polymers in a concentrated suspension is evaluated from the perspective of molecular structure, the amount of adsorbed polymer, and the amount of entrapped water in the clusters of CaCO 3 particles. Furthermore, the addition of certain soluble salts, which can effect the concentration of Ca 2+ in liquid phase of CaCO 3 suspensions, has been observed to decrease the adsorption of comb‐type polymers on CaCO 3 . Thus, the polymer adsorption process on solid surfaces can be selectively influenced by certain types of ions.