Direct two-step synthesis of n-butyl acrylate–acrylic acid block copolymer by RAFT polymerization
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A series of narrow-MMD polymers with the molecular mass from 33 × 103 to 123 × 103 (polydispersity coefficient 1.08–1.16) were synthesized by bulk polymerization of n-butyl acrylate [2,2′-azobis(isobutyronitrile), 60°C] in the presence of a low-molecular-mass RAFT agent, dibenzyl trithiocarbonate. Then, polymerization of acrylic acid was performed in aqueous-alcoholic solution (ammonium persulfate, 70°C) in the presence of the obtained polymers, and a series of n-butyl acrylate–acrylic acid block copolymers with the molecular masses from 22 × 103 to 81 × 103 (polydispersity coefficient 1.07–1.13) were prepared. In aqueous-alcoholic solutions of the synthesized copolymers, there are nanoparticles whose size varies from 5 tо 65 nm and increases with an increase in the molecular mass of the copolymer and in the concentration of water in the solvent.
KeywordsBlock Copolymer Acrylic Acid Diblock Copolymer Butyl Acrylate Raft Agent
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