Characterization of drawn monofilaments of liquid crystalline polymer/carbon nanoparticle composites correlated to nematic order

Estelle Kalfon-Cohen*, Gad Marom, Ellen Wachtel, Alessandro Pegoretti

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

In this study a nanocomposite monofilament composed of a nematic thermotropic liquid crystalline polymer (TLCP) mixed with 1.5 wt.% of carbon nanoparticles (CNP) was prepared by melt extrusion. The nanoparticles had either a fibrous (VGCF) or layered (GNP) geometry. The tensile strength and modulus of the fibers increased with the draw down ratio of the filament; a positive effect on the tensile modulus is displayed by fibrous CNP, achieving values higher than those of high property organic fibers utilized as reinforcement for composite materials. Thermotropic transitions were characterized by DSC and in situ synchrotron WAXD. In particular, it was shown that the breadth of the temperature span of the crystalline-nematic transition correlated inversely with the draw down ratio. At high draw down ratio, addition of CNP also increased the relative amount of oriented polymer chains and contributed to sharpening of the mesomorphic transition.

Original languageEnglish
Pages (from-to)1797-1804
Number of pages8
JournalPolymer
Volume50
Issue number7
DOIs
StatePublished - 20 Mar 2009

Keywords

  • Carbon nanoparticles
  • Drawn monofilament
  • Nematic order

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