Mechanical behavior of polystyrene grafted carbon nanotubes/polystyrene nanocomposites

B. Fragneaud, K. Masenelli-Varlot, A. Gonzalez-Montiel, Mauricio Terrones Maldonado, J. Y. Cavaillé

Research output: Contribution to journalArticle

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Abstract

This study is concerned with the improvement of interfacial adhesion in polystyrene - carbon nanotubes composites by grafting polystyrene chains onto the nanotube surface. Based upon a previously described method (Fragneaud B, Masenelli-Varlot K, Gonzalez-Montiel A, Terrones M, Cavaille JY. Efficient coating of N-doped carbon nanotubes with polystyrene using atom transfer radical polymerization. Chem Phys Lett 2006;419(4-6):567-73), the polystyrene was covalently bond onto the nanotube surface with an average molecular weight of about 104 g mol-1 from which composites with different nanotube weight fraction were synthesized. The grafting efficiency, has been extrapolated from dynamic stress-train data in the linear viscoelastic domain (below and above Tg) as the same as using compressive tests below Tg. In this work, it is shown that short chains polymer grafting, (i) enhanced the dispersion of the nanotubes within the matrix, (ii) increased the Young modulus below Tg, and (iii) increased the stress breaking of the nanocomposites. We also note that the low molecular weight grafting plasticize the matrix near the nanotube surface. The linear viscoelastic behavior is compared with predictions from a mechanical coupling model. Finally, the role of the nanotube waviness, percolation, as well as the entanglement is discussed.

Original languageEnglish (US)
Pages (from-to)3265-3271
Number of pages7
JournalComposites Science and Technology
Volume68
Issue number15-16
DOIs
StatePublished - Dec 1 2008

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Carbon Nanotubes
Polystyrenes
Nanotubes
Carbon nanotubes
Nanocomposites
Molecular weight
Atom transfer radical polymerization
Composite materials
Polymers
Adhesion
Elastic moduli
Coatings

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Engineering(all)

Cite this

Fragneaud, B. ; Masenelli-Varlot, K. ; Gonzalez-Montiel, A. ; Terrones Maldonado, Mauricio ; Cavaillé, J. Y. / Mechanical behavior of polystyrene grafted carbon nanotubes/polystyrene nanocomposites. In: Composites Science and Technology. 2008 ; Vol. 68, No. 15-16. pp. 3265-3271.
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Mechanical behavior of polystyrene grafted carbon nanotubes/polystyrene nanocomposites. / Fragneaud, B.; Masenelli-Varlot, K.; Gonzalez-Montiel, A.; Terrones Maldonado, Mauricio; Cavaillé, J. Y.

In: Composites Science and Technology, Vol. 68, No. 15-16, 01.12.2008, p. 3265-3271.

Research output: Contribution to journalArticle

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