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Biobased Amphiphilic Block Copolymers by RAFT-Mediated PISA in Green Solvent
Fanny Coumes1, Mauricio Balarezo1, Jutta Rieger1
1Sorbonne Université, CNRS Institut Parisien de Chimie Moléculaire, UMR 8232, Equipe Chimie des Polymères, Paris Cedex 05, 75252, France.
Abstract:
Biobased amphiphilic diblock copolymers are prepared thanks to the combination of reversible addition-fragmentation transfer (RAFT) polymerization and polymerization-induced self-assembly (PISA) in an eco-friendly solvent mixture. First, the formation of a poly(acrylic acid) macroRAFT agent (PAA-TTC) is performed in water at 70 °C. Then, in a series of experiments, the PAA-TTC macroRAFT agent is used directly, without purification, as both chain transfer agent and stabilizing agent in the RAFT-PISA of menthyl acrylate (MnA) in dispersion in an ethanol/water mixture. The polymerizations of MnA are fast with high final conversions and well-controlled amphiphilic diblock copolymers are synthesized. Stable, sub-micrometric spherical particles composed of the diblock copolymers are formed. The influence of the monomer concentration and the length of the solvophobic block on the diameter of the self-assemblies is studied by means of dynamic light scattering and cryogenic transmission electron-microscopy.
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