Abstract
We report on the rheological properties of water suspensions of poly(methacrylic acid-co-poly(ethylene oxide) methyl ether methacrylate)-b-polystyrene and poly(methacrylic acid-co-poly(ethylene oxide) methyl ether methacrylate)-b-poly(methyl methacrylate) self-assembled amphiphilic block copolymer nanofibers, synthesized via RAFT-mediated aqueous emulsion polymerization. The viscoelastic properties were studied over a range of nanofiber concentrations spanning the transition from the dilute to semidilute regimes. From the measured viscoelastic parameters, two sets of suspensions could be differentiated depending on their aspect ratio (length/diameter ≈70 and ≈54) and the average length of the nanofibers was calculated in the 2.4 μm – 3.8 μm range. The viscoelastic properties appeared to depend mainly on the aspect ratio of the fibers rather than on their nature and composition. As expected the zero shear viscosity was observed to scale with the volume fraction ϕ as η0 ∝ ϕ1 and η0 ∝ ϕ3 for dilute and semid...
Published Version
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