Synthesis and Characterization of Hyperbranched Polyurethanes Prepared from Blocked Isocyanate Monomers by Step-Growth Polymerization

Ralph Spindler, Jean Frechet*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

161 Scopus citations

Abstract

The step-growth polymerization of the AB2 blocked isocyanate monomr 3,5-bis((benzoxycarbonyl)imino)benzyl alcohol at a monomer concentration of 1 M results in the formation of a hyperbranched Polyurethane with Mw = 34 000. When the monomer concentration is increased to 2 M, a cross-linked polymer forms through the occurrence of a small amount of side reactions involving free isocyanate intermediates. Soluble polymers can be prepared, independent of the monomer concentration, when an end-capping alcohol is added at the start of the polymerization. The end-capping groups change the physical properties of the polymers such as Tg and solubility.

Original languageEnglish (US)
Pages (from-to)4809-4813
Number of pages5
JournalMacromolecules
Volume26
Issue number18
DOIs
StatePublished - Jan 1 1993

ASJC Scopus subject areas

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

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