Journal
MACROMOLECULES
Volume 44, Issue 14, Pages 5590-5598Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma2008282
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- Arkema
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The SG1-mediated copolymerization of methacrylic acid and a small percentage of sodium 4-styrenesulfonate was performed in water solution at 76 degrees C, using BlocBuilder as an alkoxyamine initiator under acidic conditions. Unexpectedly, these conditions, which could be considered as rather unfavorable due to the instability of SG1 in acidic water, led to very good results in term of polymerization kinetics and control over polymer chain growth. It appeared that low temperature and short reaction time were the key parameters to maintain a good living character to the chains as evaluated by in situ P-31 NMR. The, aqueous system was then used directly as the polymerization medium for the emulsion copolymerization of methyl methacrylate and styrene performed at 90 degrees C. This one-pot procedure led to the synthesis of amphiphilic block copolymers that self-assembled into stable core-shell nanoparticles.
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