Anionic Synthesis of Dipyridine Chain End-Functionalized Polystyrene and Polybutadiene

作者：Ji Sang chul; Lee Jong seop; Kim Doo hwan; Kang Cheol han; Park Jong hyuk; Lee Bum jae^*

来源：Polymer-Korea, 2010, 34(2): 159-165.

• living anionic polymerization
• chain end-functionalized polymer
• di(2-pyridyl)ketone
• dipyridine-terminated polymer

Dipyridine-terminated polystyrenes and polybutadienes were synthesized by the chain end-functionalization reaction of polystyryllithium (PSLi) and polybutadienyllithium (PBDLi) with di(2-pyridyl) ketone (DON) using a living anionic polymerization method in the Ar-glove box. Living polymeric lithiums with low molecular weights (Mw=1000 similar to 2000 g/mol) were used to investigate the chain end-functionalization yield with DPK and the degree of coupling reaction by the attack of organolithium to the pyridine ring in the presence of TMEDA using GPC, H-1-NMR, C-13-NMR analysis. DPK-terminated PBD exhibited much higher functionalization yield and less amount of coupling reaction compared with DPK-terminated PS. 86% functionalization yield with 9% degree of coupling was obtained when the PBDLi was added dropwise to DPK solution at room temperature. The functionalization yield was increased as the reaction temperature decreased, however, no LiCl effect was observed in this chain end-functionalization reaction with DPK.

• 出版日期2010-3