조절 라디칼 중합법을 이용한 PAN 함량이 많은 PEO-b-PAN 블록 공중합체의 합성

초록

Poly(ethylene oxide-b-acrylonitrile) (PEO-b-PAN) block copolymers were preparedas precursors to mesoporous carbons. Redox-initiated radical polymerization andcontrolled radical polymerization techniques, such as reversible addition-fragmentationchain transfer (RAFT) and activators regenerated by electron transfer atom-transfer radicalpolymerization (ARGET ATRP), were successfully applied to prepare PEO-b-PAN block copolymerswith high PAN content. Radical polymerization of acrylonitrile (AN) using ceric ion asredox initiator gave block copolymers with PEO:PAN ratio of up to 1:38.4, but their highmolecular weight and polydispersity index (PDI) indicated that the structure was not controlled. Therefore, in order to achieve better control on the structure of the PAN block, controlledradical polymerization techniques were used. Poly(ethylene oxide) with trithiocarbonate(PEO-CTA) and bromide (PEO-Br) end groups were synthesized as polymeric chain transferagent for the RAFT process and as initiator for the ATRP process, respectively. The RAFT processof AN using PEO-CTA gave block copolymers with PAN block length 0.53–3.58 timesthat of the PEO block. Moreover, ARGET ATRP allowed to prepare block copolymers with avery high molecular weight of 72,000, while maintaining a PDI value as low as 1.20.

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