Hydrogen bond containing multiwalled carbon nanotubes in polyurethane composites

David Inglefield, Robert J. Bodnar, Timothy Edward Long

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Introduction of hydrogen bonding sites onto multi-walled carbon nanotubes (MWCNTs) included carboxylic acid, amide-amine, and novel amide-urea MWCNTs for the formation of homogenous polyurethane composites. Acid oxidation and subsequent derivatization introduced hydrogen bonding functionality onto MWCNTs to reveal the effect of surface functionalization on mechanical properties in a 45 wt% hard segment polyurethane matrix. Raman spectroscopy showed an increase in the D/G peak ratio, which indicated successful oxidation, and X-ray photoelectron spectroscopy also revealed elemental compositions that supported each step of the functionalization strategy. Thermogravimetric analysis supported functionalization with an increase in percent weight loss for each functionalization, and the MWCNT surface functionalization determined pH-dependent dispersibility. The nonfunctionalized MWCNT composites showed poor dispersion with transmission electron microscopy, and in sharp contrast, the functionalized composites displayed homogenous dispersions. Tensile testing revealed improved stress at break in the functionalized MWCNT composites at low loadings due to homogenous dispersion.

Original languageEnglish
Pages (from-to)1425-1434
Number of pages10
JournalPolymer Composites
Volume37
Issue number5
DOIs
Publication statusPublished - 2016 May 1
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

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