Electrical behavior of polyurethane composites with acid treatment-induced damage to multiwalled carbon nanotubes

Pill Gyu Jang, Kwang S. Suh, Min Park, Jun Kyung Kim, Woo Nyon Kim, Ho Gyu Yoon

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We have studied the electrical conductivity and percolation threshold of polyurethane (PU) composites filled with multiwalled carbon nanotubes (MWCNT) purified by increasing immersion time in aqueous solutions of either nitric acid or a mixture of nitric and sulfuric acids at 80°C. The MWCNT crystallinity peaks after 2 h of treatment, which enables the PU composites to enhance the percolation threshold and electrical conductivity in the conductive network formation region. MWCNT treated under either a milder or severer acidic condition deteriorate the electrical behavior of the composites, since MWCNT are poorly dispersed in the PU matrix in the former condition,but lost their intrinsic electrical conductivity due to the partial destruction of their crystalline structure in the latter. Therefore, the acid treatment needs to be carefully controlled to effectively purify the MWCNT, maintain the crystalline structure without further damage, and thereby improve the electrical behavior of PU/MWCNT composites.

Original languageEnglish
Pages (from-to)110-116
Number of pages7
JournalJournal of Applied Polymer Science
Volume106
Issue number1
DOIs
Publication statusPublished - 2007 Oct 5

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Keywords

  • Acid treatment-induced damage
  • Electrical conductivity
  • Percolation
  • Polyurethane/MWCNT composites

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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