Branched and functionalized polybutadienes by a facile two-step synthesis

Frederik Wurm, Francisco J. López-Villanueva, Holger Frey*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

27 Citations (Scopus)

Abstract

Anionic polymerization was used to prepare silane-endfunctionalized polybutadiene macromonomers with different molecular weights ranging from 9000 to 34000 g · mol-1 These were polymerized by a hydrosilylation reaction in bulk to obtain branched polymers, using Karstedt's catalyst. Surprisingly, the addition of monofunctional silanes during the polymerization showed only a minimal effect concerning the degree of polymerization. Furthermore, it was possible to introduce a variety of functional silanes without increasing the overall number of reaction steps by a convenient AB 2 + A type "pseudocopolymerization" method. All branched polymers were analyzed by SEC, SEC-MALLS, SEC-viscosimetry. 1H NMR spectroscopy, and DSC concerning their branching ratio. The branching parameters for the branched polymers exhibited similar characteristics as for hyperbranched polymers obtained from conventional AB2 monomers. Detailed kinetic studies showed that the polymerization occurred very rapidly in comparison to the hydrosilylation polymerization of classical AB2 type carbosilane monomers.

Original languageEnglish
Pages (from-to)675-684
Number of pages10
JournalMacromolecular chemistry and physics
Volume209
Issue number7
DOIs
Publication statusPublished - 4 Apr 2008
Externally publishedYes

Keywords

  • Anionic polymerization
  • Dendritic materials
  • Hydrosilylation
  • Hyperbranched polymers
  • Macromonomers
  • Polybutadiene
  • Polyisoprene

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