Synthesis of well-defined second (G-2) and third (G-3) generation dendritic polybutadienes

Katerina Orfanou, Hermis Iatrou, David J. Lohse*, Nikos Hadjichristidis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

A series of well-defined second (G-2) and third (G-3) generation dendritic polybutadienes (PBd) were synthesized by the coupling of the living G-2 and G-3 dendrons with methyltrichlorosilane, using anionic polymerization high-vacuum techniques. The synthetic approach of the living G-2 dendrons involves (a) the synthesis of an in-chain double-bond PBd by selective replacement of the two chlorines of 4-(dichloromethylsilyl)-diphenylethylene (DCMSDPE), a novel linking reagent with dual functionality, with PBd by titration with PBdLi, (b) addition of s-BuLi to the double bond, and finally (c) polymerization of butadiene from the newly created anionic site. The synthesis of the G-3 dendrons requires the repetition of the aforementioned procedure with the exception of the addition of the living G-2 dendron, instead of PBdLi, to DCMSDPE. Intermediate and final products were characterized via size exclusion chromatography, membrane osmometry, size exclusion chromatography equipped with a two-angle laser light scattering detector, and proton nuclear magnetic resonance. The combined characterization results indicate that the dendritic PBds synthesized have high molecular and structural homogeneity.

Original languageEnglish (US)
Pages (from-to)4361-4365
Number of pages5
JournalMacromolecules
Volume39
Issue number13
DOIs
StatePublished - Jun 27 2006
Externally publishedYes

ASJC Scopus subject areas

  • Materials Chemistry

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