Anionic polymerization of n-hexyl isocyanate with monofuctional initiators. Synthesis of well-defined diblock copolymers with styrene and isoprene

Georgia Zorba, Aggelos Vazaios, Marinos Pitsikalis, Nikos Hadjichristidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Several monofunctional initiators, such as s-BuLi, 1,1-diphenyl-4- methylpentyl lithium (DPMPL), benzyl potassium (BzK), triphenylmethyl sodium (trityl sodium, TrNa) and benzyl sodium (BzNa) were tested and evaluated for the polymerization of n-hexyl isocyanate (HIC) in THF at -98°C. The polymerizations were conducted either without or with additives, such as LiBPh4, NaBPh4, and crown ether 18C6. The products were characterized by size exclusion chromatography (SEC), membrane osmometry (MO), and IH NMR spectroscopy. The best results regarding polymerization yield, molecular weight distribution, and agreement between the stoichiometric and the experimentally observed molecular weight were obtained by the initiating system BzNa/NaBPh4 in a molar ratio 1/10. By using BzNa/NaBPh 4 system, well-defined block copolymers of HIC with styrene or isoprene were synthesized for the first time.

Original languageEnglish (US)
Pages (from-to)3533-3542
Number of pages10
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume43
Issue number16
DOIs
StatePublished - Aug 15 2005
Externally publishedYes

Keywords

  • Anionic polymerization
  • Benzyl sodium
  • Block copolymers
  • Gel permeation chromatography
  • Light scattering
  • Polyisocyanates

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

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