Synthesis of temperature-responsive heterobifunctional block copolymers of poly(ethylene glycol) and poly(N-isopropylacrylamide)

Ye Zi You, David Oupický

Research output: Contribution to journalArticle

96 Scopus citations

Abstract

Heterobifunctional block copolymers of poly(ethylene glycol) (PEG) and poly(N-isopropylacrylamide) (PNIPAM) were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization of NIPAM using a macromolecular trithiocarbonate PEG-based chain transfer agent. The polymerization showed all the expected features of living radical polymerization and allowed the synthesis of copolymers with different lengths of the PNIPAM block. The synthesized block copolymers contained a carboxylic acid group from L-lysine at the focal point and a trithiocarbonate group at the terminus of the PNIPAM block. The trithiocarbonate functionality was converted into a thiol group and used for conjugation of biotin to the end of the PNIPAM block. The copolymers exhibited temperature-dependent association behavior in aqueous solution with a phase transition of approximately 32°C. The described heterobifunctional block copolymers show promise for surface modifications with the potential for stimulus-controlled surface presentation of ligands attached to the terminus of the PNIPAM block.

Original languageEnglish (US)
Pages (from-to)98-105
Number of pages8
JournalBiomacromolecules
Volume8
Issue number1
DOIs
StatePublished - Jan 1 2007

ASJC Scopus subject areas

  • Bioengineering
  • Biomaterials
  • Polymers and Plastics
  • Materials Chemistry

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