RAFT Synthesis of Poly(4-hydroxystyrene)-b-Poly(N-vinylamine) Diblock Copolymer and Its Dual pH-Responsive Behavior in Aqeous Media

다국어 초록 (Multilingual Abstract)

Poly(N-vinylamine) (PVAm) is a hydrophilic polymer having a large number of primary amine groups which can be utilized for various applications; hydrogen bond-reinforced polymer gels, CO₂/pH-responsive polymers, ion exchange membranes, and others. However, only few studies have been reported for the synthesis of PVAm block copolymers. Here, we synthesize dual pH-responsive polymer poly(4-hydroxystyrene)-b-poly(N-vinylamine) (PHS-b-PVAm) by Reversible Addition Fragmentation Chain-Transfer (RAFT) polymerization. 4-Acetoxystyrene and N-vinylformamide monomers were used to synthesize precursor polymers, poly(4-acetoxystyrene)- b-poly(Nvinylformamide) (PAcOS-b-PNVF), by using ‘Switchable’ RAFT agent, and then the precursor polymers were deprotected through hydrolysis. Detailed synthesis and the property of PVAm block copolymers will be presented.