Synthesis of polystyrene-B-Poly(ethylene glycol) block copolymers by radical exchange reactions of terminal RAFT agents

Mustafa Arslan, Gorkem Yilmaz, Yusuf Yagci*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

In this study, a mechanistic transformation was achieved by taking advantage of coupling reaction of reversible addition-fragmentation chain transfer (RAFT) agents. Polymers prepared by different polymerization modes were coupled to form polystyrene-b-poly(ethylene glycol) (PS-b-PEG) block copolymer. For this purpose, two prepolymers, namely azo and RAFT functional polymers were prepared independently. In the first step, a new macroazoinitiator (MI)-containing PEG units was synthesized by direct esterification of 4,4-azobis(4-cyanopentanoic acid) (ACPA) with poly(ethylene glycol) (PEG) at ambient conditions. The other component, polystyrene (PS) was synthesized by atom transfer radical polymerization and modified with a reversible addition-fragmentation chain transfer (RAFT) agent (xanthate moiety) and used as a polymeric RAFT agent for the block copolymer formation. In the block copolymerization process, polymeric radicals stemming from the thermolysis of PEG-MI were coupled with the RAFT moiety of PS. The PEG-MI, PS, PS-XANTH, and PS-PEG block copolymers were characterized by spectral analysis using FT-IR, 1H NMR, GPC, and DSC.

Original languageEnglish
Pages (from-to)238-244
Number of pages7
JournalDesigned Monomers and Polymers
Volume17
Issue number3
DOIs
Publication statusPublished - 3 Apr 2014

Keywords

  • RAFT agent
  • block copolymer
  • macroazoinitiator
  • poly(ethylene glycol)
  • polystyrene

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