Cyclic and multiblock polystyrene-block-polyisoprene copolymers by combining anionic polymerization and azide/alkyne "click" chemistry

Athanasios Touris, Nikolaos Hadjichristidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

An α,ω-heterotelechelic block copolymer of polystyrene (PS) and polyisoprene (PI), α-acetylene-ω-azido-PS-b-PI, with Mn = 18 900 and PDI = 1.05, was synthesized by (a) sequential anionic polymerization of styrene and isoprene with 5-triethylsilyl-4-pentynyllithium (TESPLi) as initiator to afford α-(TES-acetylene)-ω-lithium-PS-b-PI, (b) reaction of the living heterofunctionalized copolymer with 1,4-dibromobutane and sodium azide to give α-(TES-acetylene)-ω- azido-PS-b-PI, and (c) deprotection of the acetylene group to afford the final product α-acetylene-ω-azido-PS-b-PI. This α,ω- heterotelechelic block copolymer with "clickable" groups, in the presence of CuBr and N,N,N′,N′′,N′′- pentamethyldiethylenetriamine, led to cyclic block copolymer in dilute solution (lower than the equilibrium concentration <6 × 10-5 g/mL), whereas in concentrated solutions (5.3 × 10-2 g/mL) gave multiblock copolymers.

Original languageEnglish (US)
Pages (from-to)1969-1976
Number of pages8
JournalMacromolecules
Volume44
Issue number7
DOIs
StatePublished - Apr 12 2011

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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