| 초록 |
Poly(N-vinylamine) (PVAm) has a large number of primary amine groups. However, there have been few reports about synthesis of PVAm through controlled radical polymerization. We synthesized poly(4-hydroxystyrene)–b-poly(N-vinylamine) (PHS-b-PVAm) by using Reversible Addition Fragmentation Chain-Transfer (RAFT) polymerization. We use ‘switchable’ RAFT agent to make poly(4-acetoxystyrene)-b-poly(N-vinylformamide) (PAcOS-b-PNVF), the precursor of PHS-b-PVAm, in which reactivity of the active C-S double bond on thiocarbonyl group can be controlled by protonation/deprotonation of Z group of RAFT agent. This agent gives good control over the polymerization of both PAcOS and PNVF block. Hydrolysis of PAcOS-b-PNVF produces diblock polyampholyte PHS-b-PVAm which has acidic phonolic moeity on hydroxystyrene block and basic primary amine on vinylamine block. The resulting polymer self-assembled in water, forming spherical nanoparticles. Also, the diblock copolymer shows pH-responsive behavior. |
