Synthesis and pH-Responsive Behavior of Poly(4-hydroxystyrene)–<EM>b</EM>-Poly(<EM>N</EM>-vinylamine) Diblock Copolymer
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Poly(N-vinylamine) (PVAm) is a waterborne polymer having a large number of primary amine groups which can be utilized for various uses; hydrogen bonded polymer gels, CO2/pH-responsive polymers, ion exchange membranes, and other applications. But only few studies have been reported for the synthesis of PVAm based block copolymers. We synthesized poly(4-hydroxystyrene)–b-poly(N-vinylamine) (PHS-b-PVAm) by Reversible Addition Fragmentation Chain-Transfer (RAFT) polymerization of 4-acetoxystyrene and N-vinylformamide with ‘Switchable’ RAFT agent to make a precursor polymer, poly(4-acetoxystyrene)-b-poly(N-vinylformamide) (PAcOS-b-PNVF), followed by the subsequent hydrolysis. The protonation-driven change in reactivity of C-S double bond of the RAFT agent provides a control over the polymerization of the both AcOS and NVF. Detailed synthesis and self-assembly behavior of PHS-b-PVAm diblock copolymer will be presented.