Role of architecture and molecular weight in the formation of tailor-made ultrathin multilayers using dendritic macromolecules and click chemistry

Robert Vestberg, Michael Malkoch, Matthew Kade, Peng Wu, Valery V. Fokin, K. Barry Sharpless, Eric Drockenmuller, Craig J. Hawker

Research output: Contribution to journalArticle

109 Scopus citations

Abstract

The high efficiency and mild reaction conditions associated with the Cu(I) catalyzed cycloaddition of azides and alkynes were exploited for the covalent layerby-layer synthesis of dendritic thin films on silicon wafers. The preparation of azide and alkyne-terminated dendrimers based on bisMPA was accomplished by a divergent strategy; combinations of these monodisperse building blocks from the 2nd to the 5th generation were used for construction of the thin films. The layer-by-layer self assembly process proceeds under ambient conditions and was monitored by ellipsometry, XPS, and ATR-IR, which showed extremely regular growth of the dendritic thin films. Film thickness could be accurately controlled by both the size/generation number of the dendrimers as well as the number of layers. In comparison with linear analogues, the growth of the dendritic films was significantly more controlled and defect-free with each layer being thinner than the corresponding films prepared from the isomeric linear polymers, demonstrating the well-defined, three-dimensional nature of the dendritic architecture.

Original languageEnglish (US)
Pages (from-to)2835-2846
Number of pages12
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume45
Issue number14
DOIs
StatePublished - Jul 15 2007

Keywords

  • Dendrimers
  • Functionalization of polymers
  • Layer growth
  • Thin films

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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