Influence of the stirring speed and CaCl2 concentration on the nano‐object morphologies obtained via RAFT‐mediated aqueous emulsion polymerization in the presence of a water‐soluble macroRAFT agent |
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| Authors: | Stéphanie Boissé Jutta Rieger Gaëlle Pembouong Patricia Beaunier Bernadette Charleux |
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| Institution: | 1. UPMC Univ. Paris 6 and CNRS, Laboratoire de Chimie des Polymères, UMR 7610, 3 rue Galilée, 94200 Ivry, France;2. Laboratoire Physico‐Chimie Curie, Institut Curie and CNRS, UMR 168, 26 rue d'Ulm, 75248 Paris Cedex 05, France;3. UPMC Univ. Paris 6 and CNRS, Laboratoire de Réactivité de Surface, UMR 7197, 3 rue Galilée, 94200 Ivry, France;4. Université de Lyon, Univ Lyon 1, CPE Lyon, CNRS, UMR 5265, C2P2 (Chemistry, Catalysis, Polymers & Processes), Team LCPP Bat 308F, 43 Bd du 11 novembre 1918, 69616 Villeurbanne, France |
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| Abstract: | Aqueous emulsion polymerizations of styrene were performed in the presence of a macromolecular reversible addition‐fragmentation chain transfer (RAFT) agent (macroRAFT) composed of acrylic acid (AA) and poly(ethylene oxide) methyl ether acrylate (PEOA), end‐capped by a reactive dodecyl trithiocarbonate group (P(AA‐co‐PEOA)‐TTC). The influence of the stirring speed or the presence of different amounts of a divalent salt, CaCl2, were investigated in this polymerization‐induced self‐assembly process, in which spherical and nonspherical nano‐objects were formed upon the synthesis of amphiphilic diblock copolymers in situ. It appeared that the addition of CaCl2 led to the controlled formation of different nano‐objects such as spheres, fibers or vesicles, whereas an appropriate stirring speed was required for the formation of nanofibers. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 |
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| Keywords: | block copolymers controlled/living free‐radical polymerization emulsion polymerization reversible addition fragmentation chain transfer (RAFT) self‐assembly |
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