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Rheological properties of iron oxide particle suspensions
Author(s) -
Nagashiro Waichi,
Tsunoda Teruo
Publication year - 1980
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1980.070251226
Subject(s) - shear rate , rheology , epoxy , materials science , viscosity , phenol , polymer , dispersion (optics) , volume fraction , particle size , particle (ecology) , relative viscosity , chemical engineering , composite material , polymer chemistry , chemistry , organic chemistry , physics , oceanography , geology , optics , engineering
Viscosities of γ‐Fe 2 O 3 dispersions in epoxy resin, phenol resin, and polyvinyl butyral solutions are measured at shear rate D from 19.2 to 384 sec −1 . Volume fraction of γ‐Fe 2 O 3 in these dispersions ranges from about 0.002 to 0.03. The concentration dependence of relative viscosity η/η s is closely represented by the Mooney equation. From this equation, intrinsic viscosity [η] of suspensions is found to decrease from 46.1 at D = 19.2sec −1 to 14 at D = 384 sec −1 for epoxy resin solution. The high [η] value indicates the existence of flocs containing immobilized liquid. By increasing the shear rate, the average floc size is reduced to point where at an infinite shear rate, only small clusters or possibly particles remain. Of the three polymers, the lowest [η] value is obtained in the dispersion of the phenol resin solution.