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Effect of Polymer Dispersant Structure on Electrosteric Interaction and Dense Alumina Suspension Behavior
Author(s) -
Kamiya Hidehiro,
Fukuda Yoshiyuki,
Suzuki Yoshio,
Tsukada Mayumi,
Kakui Toshio,
Naito Makio
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb02258.x
Subject(s) - dispersant , dlvo theory , steric effects , suspension (topology) , polymer , chemical engineering , viscosity , adsorption , materials science , intrinsic viscosity , polymer chemistry , chemistry , dispersion (optics) , organic chemistry , colloid , composite material , physics , mathematics , homotopy , pure mathematics , optics , engineering
The present paper reports on research on the effect of molecular structure of polymer dispersants on the relationship between the electrosteric interaction of dispersants on solid surfaces and the viscosity of suspensions. Ammonium polyacrylate with different hydrophilic to hydrophobic ratios ( m:n ) was prepared and added to dense Al 2 O 3 suspensions (40 vol%). The steric interactions and adsorbed structures of dispersants on Al 2 O 3 powders were examined under an atomic force microscope (AFM). An optimum hydrophilic to hydrophobic group ratio, which was obtained from the maximum repulsive force and the minimum viscosity of suspension, was determined at m :n = 3:7. The changing mechanism of the adsorbed structure and the steric interaction of dispersants and the suspension viscosity by the hydrophilic to hydrophobic molecular ratio were discussed by comparing the experimental force curve and DLVO theory.