Abstract
The rheological behavior and stability of aqueous magnesium hydroxide (Mg(OH)2) suspensions were studied in the presence of comb-like polyelectrolyte, namely, sodium salts of poly(acrylic acid)-poly(ethylene oxide) (NaPAA–PEO) at high ionic strength. Rheological, sedimentation, and zeta potential measurements were conducted on Mg(OH)2 suspensions to assess the dispersing ability of NaPAA–PEO. The adsorption behavior of NaPAA–PEO on the surfaces of Mg(OH)2 particles was investigated by the adsorption isotherm measurements. The interparticle interactions were calculated by using the Hamaker 2 program to evaluate the effect of NaPAA–PEO dosage on the stability of suspensions. The results indicated that NaPAA–PEO, which is insensitive to ionic strength variation, could improve the salt-tolerance of Mg(OH)2 suspensions and provide effective electrosteric stabilization, thus facilitating the production process and application of Mg(OH)2 suspensions over broad range of ionic strength.
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