120th General Meeting of the KCS

Type Poster Presentation
Area Polymer Chemistry
Room No. Exhibition Hall 2+3
Time 10월 20일 (금요일) 13:00~14:30
Code POLY.P-19
Subject Synthesis of pH-responsive Diblock Copolymer poly(4-hydroxystyrene–b-N-vinylamine) by using RAFT polymerization
Authors Jun Hyok Yoon, Sang Youl Kim1,*
Chemistry, Korea Advanced Institute of Science and Technology, Korea
1Department of Chemistry, Korea Advanced Institute of Science and Technology, Korea
Abstract Poly(N-vinylamine) (PVAm) an interesting polymer which is the simplest amine containing polymer. However, synthesis of PVAm is challenging problem, the monomer can undergoes tautomeric imine and forming undesired complex dondensates. So, there have been few reports about synthesis of PVAm through controlled radical polymerization. We synthesized poly(4-hydroxystyrene–b-N-vinylamine) (PHS-b-PVAm) by using Reversible Addition Fragmentation Chain-Transfer (RAFT) polymerization. We use ‘switchable’ RAFT agent to make poly(p-acetoxystyrene-b-N-vinylformamide) (PAcOS-b-PNVF), the precursor of PHS-b-PVAm, in which reactivity of the active C-S double bond on thiocarbonyl group, by protonation/deprotonation of Z group of RAFT agent. This agent gives unusual, good control over the polymerization of both PAcOS and PNVF block. Hydrolysis of PAcOS-b-PNVF gives 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 micelle nanoparticles. Also, it shows pH-responsive character for both acidic and basic condition.
E-mail yoonjun5@kaist.ac.kr