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Effect of Arm Exchange on the Liquid–Solid Transition of Dense Suspensions of Star Polymers

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journal contribution
posted on 10.10.2013 by Fanny Puaud, Taco Nicolai, Lazhar Benyahia, Erwan Nicol
Star polymers with dynamic arm exchange are formed in water by self-assembly of amphiphilic diblock copolymers based on poly­(ethylene oxide) end capped with a small hydrophobic block. The arm exchange was arrested in situ by photo-cross-linking of the core. The effect of dynamic arm exchange on the osmotic compressibility and viscosity was investigated systematically as a function of the concentration and temperature. The discontinuous liquid–solid transition reported for dense polymeric micelle suspensions was found to be preserved after dynamic arm exchange was arrested in situ. The effect of cross-linking and aggregation number on the liquid–solid transition was investigated.