Synthesis and Properties of Novel Linear-Dendritic Block Copolymers. Reactivity of Dendritic Macromolecules toward Linear Polymers

Ivan Gitsov, Karen L. Wooley, Craig J. Hawker, Pavlina T. Ivanova, Jean Frechet*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

179 Scopus citations

Abstract

The reactivity of benzylic dendritic polyethers toward linear polymers was investigated using coupling reactions of preformed dendritic and linear blocks in solution and in the melt. It was found that the rate constants for the Williamson reaction of poly(ethylene oxide)s (PEO) or poly(ethylene glycol)s (PEG) with dendritic bromides of various sizes increased with the length of the linear block and the generation of the dendrimer. This anomalous behavior is attributed to the increased reactivity of the PEO and PEG alcoholate anions due to the solvation of the counterion by the linear block and to the conformation changes occurring after attachment of the first dendritic block to PEG. It was shown that the functional group at the “focal point” of the dendrimer preserves its accessibility and reactivity even in highly restrictive medium and is able to participate in transesterification reactions with PEO and PEG in the melt. Thus, block copolymers that differ by a single linking bond between the linear and dendritic blocks were formed.

Original languageEnglish (US)
Pages (from-to)5621-5627
Number of pages7
JournalMacromolecules
Volume26
Issue number21
DOIs
StatePublished - Jan 1 1993

ASJC Scopus subject areas

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

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