Dynamics of single-walled carbon nanotube (SWNT)/polyisoprene (PI) nanocomposites in electric and mechanical fields

HyungKi Lee, Srdjan Pejanović, Iñaki Mondragon, Jovan Mijovic

Research output: Contribution to journalArticle

Abstract

Relaxation dynamics of single-walled carbon nanotube (SWNT)/polyisoprene (PI) nanocomposites were examined by dielectric relaxation spectroscopy (DRS) and dynamic mechanical spectroscopy (DMS) over a wide range of frequency and temperature. Both functionalized (SWNT-f) and pristine (SWNT-p) nanotubes were used and their effect on dynamics compared. Functionalized (PISF) nanocomposites were characterized by an increase in the time scale of the normal mode process as a consequence of the strong surface interactions between the polymer matrix and the nanotubes. The exact opposite is seen in pristine (PISP) nanocomposites where a decrease in the time scale of the normal mode relaxation is observed and attributed to weaker surface interactions and the effect of confinement on dynamics. The segmental process in PISF or PISP is not affected by the presence of nanotubes. The temperature dependence of the average relaxation time for normal and segmental modes is of the Vogel-Fulcher-Tammann (VFT) type. A good agreement is observed in the time scale of processes measured by DRS and DMS in PISF nanocomposites. In PISP nanocomposites, however, the time scales obtained from DRS and DMS measurements are not in consistently good agreement and an explanation is offered in terms of confinement.

Original languageEnglish (US)
Pages (from-to)7345-7355
Number of pages11
JournalPolymer
Volume48
Issue number25
DOIs
StatePublished - Nov 30 2007

Fingerprint

Polyisoprenes
Single-walled carbon nanotubes (SWCN)
Nanocomposites
Spectroscopy
Dielectric relaxation
Nanotubes
Polymer matrix
Relaxation time
Temperature

Keywords

  • Dielectric relaxation spectroscopy
  • Polyisoprene
  • Single-walled carbon nanotubes

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Dynamics of single-walled carbon nanotube (SWNT)/polyisoprene (PI) nanocomposites in electric and mechanical fields. / Lee, HyungKi; Pejanović, Srdjan; Mondragon, Iñaki; Mijovic, Jovan.

In: Polymer, Vol. 48, No. 25, 30.11.2007, p. 7345-7355.

Research output: Contribution to journalArticle

Lee, HyungKi ; Pejanović, Srdjan ; Mondragon, Iñaki ; Mijovic, Jovan. / Dynamics of single-walled carbon nanotube (SWNT)/polyisoprene (PI) nanocomposites in electric and mechanical fields. In: Polymer. 2007 ; Vol. 48, No. 25. pp. 7345-7355.
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