TY - JOUR
T1 - Experimental and theoretical study of phase transitions induced in colloidal dispersions by associative polymers
AU - Santore, Maria M.
AU - Russel, William B.
AU - Prud'homme, Robert Krafft
PY - 1990/12/1
Y1 - 1990/12/1
N2 - We present experimental evidence for reversible phase transitions in aqueous dispersions of acrylic lattices upon addition of two types of hydrophobically modified water-soluble polymers: hydroxyethyl cellulose with randomly placed hydrophobes, and poly(ethylene oxide) with hydrophobic end groups. In the limit of very weak polymer-particle associations flocculation occurs via depletion attraction, while strong associations lead to bridging flocculation with restabilization at higher polymer concentrations. Our observations for the end-modified poly(ethylene oxide) agree well with the predictions of our pseudo-one-component model, which we review briefly. This theory predicts the dependence of the phase transition on the polymer molecular weight and hydrophobic substitution, as well as the nature of the phase transition (fluid-fluid or fluid-solid) and the compositions of the resulting phases.
AB - We present experimental evidence for reversible phase transitions in aqueous dispersions of acrylic lattices upon addition of two types of hydrophobically modified water-soluble polymers: hydroxyethyl cellulose with randomly placed hydrophobes, and poly(ethylene oxide) with hydrophobic end groups. In the limit of very weak polymer-particle associations flocculation occurs via depletion attraction, while strong associations lead to bridging flocculation with restabilization at higher polymer concentrations. Our observations for the end-modified poly(ethylene oxide) agree well with the predictions of our pseudo-one-component model, which we review briefly. This theory predicts the dependence of the phase transition on the polymer molecular weight and hydrophobic substitution, as well as the nature of the phase transition (fluid-fluid or fluid-solid) and the compositions of the resulting phases.
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U2 - 10.1039/DC9909000323
DO - 10.1039/DC9909000323
M3 - Review article
AN - SCOPUS:0000135920
SN - 0301-7249
VL - 90
SP - 323
EP - 333
JO - Faraday Discussions of the Chemical Society
JF - Faraday Discussions of the Chemical Society
ER -