Abstract:The surface activity and the rheological properties of aqueous solutions of the amphiphilic block copolymer poly(n-butyl acrylate)-block-poly(acrylic acid) (PnBA-b-PAA) were studied as a function of the degree of neutralization, alpha, of the poly(acrylic acid) block. Although the block copolymer spontaneously forms spherical micelles having a stretched PAA corona and a collapsed PnBA core in water for alpha > 0.1, the solutions do not exhibit any surface activity at this degree of neutralization. Cryo-TEM mic… Show more
“…A lower critical gelation temperature occurs with PEO coronas, because the repulsion between PEO segments decreases with increasing temperature. In the case of aggregates with charged coronas the repulsion can be controlled by adding salt as was shown by Eghbali [21].…”
Section: Polymers With a Single Associative Block (A-b Or A-b-a)mentioning
“…A lower critical gelation temperature occurs with PEO coronas, because the repulsion between PEO segments decreases with increasing temperature. In the case of aggregates with charged coronas the repulsion can be controlled by adding salt as was shown by Eghbali [21].…”
Section: Polymers With a Single Associative Block (A-b Or A-b-a)mentioning
“…96 Besides direct correlation, also conceptual discrepancies are observed. Indeed, Eghbali et al 125 prepared copolymers of butyl acrylate and acryclic acid 3. They measured surface tension and viscosity of the corresponding water solutions as a function of the pH.…”
“…Moreover, the charge density and the extent of ionic interactions are dependent on pH and ionic strength, and consequently the rheology can be tuned by acting on these parameters. 19 Also, the addition of surfactants can have an influence on the rheological behavior of block polyelectrolytes. 17 Rheology of diblock PS-b-PAA in water has been investigated.…”
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