Synthesis and characterization of polyisoprene/polybutadiene A2B2 star copolymers

Jürgen Allgaier, Ronald N. Young*, Vasilis Efstratiadis, Nikos Hadjichristidis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


Two routes for the synthesis of star block copolymers having exactly two arms of polyisoprene (PI) and two of polybutadiene (PB) are described. The first route starts by condensing one molecule of silicon tetrachloride with two of poly(isoprenyl)lithium which has been end-capped by a few units of styrene. The second route starts by linking two poly(isoprenyllithium) chains with one molecule of silicon tetrachloride at a suitably reduced temperature. Both routes are completed by reaction of the two-armed intermediate (PI)2SiCl2 with an excess of poly(butadienyllithium). The resulting (PI)2Si(PB)2 star polymer was purified by fractionation. The reaction steps were monitored by size exclusion chromatography and the products characterized by low-angle laser light scattering, osmometry, and NMR.

Original languageEnglish (US)
Pages (from-to)1794-1797
Number of pages4
Issue number5
StatePublished - Feb 26 1996
Externally publishedYes

ASJC Scopus subject areas

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


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