Stress transfer in cellulose nanowhisker composites - Influence of whisker aspect ratio and surface charge

Rafeadah Rusli, Kadhiravan Shanmuganathan, Stuart J. Rowan, Christoph Weder, Stephen J. Eichhorn

Research output: Contribution to journalArticle

89 Citations (Scopus)

Abstract

The mechanically induced molecular deformation of cellulose nanowhiskers embedded in subpercolation concentration in an epoxy resin matrix was monitored through Raman spectroscopy. Cellulose nanowhiskers isolated by sulfuric acid hydrolysis from tunicates and by sulfuric acid hydrolysis and hydrochloric acid hydrolysis from cotton were used to study how the aspect ratio (ca. 76 for tunicate and 19 for cotton) and surface charges (38 and 85 mmol SO 4 -/kg for sulfuric acid hydrolysis of cotton and tunicate, respectively; no detectable surface charges for hydrochloric acid hydrolysis) originating from the isolation process influence stress transfer in such systems. Atomic force microscopy confirmed that uncharged cellulose nanowhiskers produced by hydrochloric acid hydrolysis have a much higher tendency to aggregate than the charged cotton or tunicate nanowhiskers. Each of these nanowhisker types was incorporated in a concentration of 0.7 vol % in a thermosetting epoxy resin matrix. Mechanically induced shifts of the Raman peak initially located at 1095 cm1 were used to express the level of deformation imparted to the nanowhiskers embedded in the resin. Much larger shifts of the diagnostic Raman band were observed for nanocomposites with tunicate nanowhiskers than for the corresponding samples comprising cotton nanowhiskers. In the case of nanocomposites comprising nanowhiskers produced by hydrochloric acid hydrolysis, no significant Raman band shift was observed. These results are indicative of different modes of stress transfer, which in turn appear to originate from the different sample morphologies.

Original languageEnglish
Pages (from-to)1363-1369
Number of pages7
JournalBiomacromolecules
Volume12
Issue number4
DOIs
Publication statusPublished - 2011 Apr 11
Externally publishedYes

Fingerprint

Nanowhiskers
Surface charge
Cellulose
Aspect ratio
Hydrolysis
Composite materials
Hydrochloric Acid
Cotton
Hydrochloric acid
Sulfuric acid
Epoxy Resins
Epoxy resins
Nanocomposites
Raman spectroscopy
Atomic force microscopy
Resins

ASJC Scopus subject areas

  • Bioengineering
  • Materials Chemistry
  • Polymers and Plastics
  • Biomaterials

Cite this

Rusli, R., Shanmuganathan, K., Rowan, S. J., Weder, C., & Eichhorn, S. J. (2011). Stress transfer in cellulose nanowhisker composites - Influence of whisker aspect ratio and surface charge. Biomacromolecules, 12(4), 1363-1369. https://doi.org/10.1021/bm200141x

Stress transfer in cellulose nanowhisker composites - Influence of whisker aspect ratio and surface charge. / Rusli, Rafeadah; Shanmuganathan, Kadhiravan; Rowan, Stuart J.; Weder, Christoph; Eichhorn, Stephen J.

In: Biomacromolecules, Vol. 12, No. 4, 11.04.2011, p. 1363-1369.

Research output: Contribution to journalArticle

Rusli, R, Shanmuganathan, K, Rowan, SJ, Weder, C & Eichhorn, SJ 2011, 'Stress transfer in cellulose nanowhisker composites - Influence of whisker aspect ratio and surface charge', Biomacromolecules, vol. 12, no. 4, pp. 1363-1369. https://doi.org/10.1021/bm200141x
Rusli, Rafeadah ; Shanmuganathan, Kadhiravan ; Rowan, Stuart J. ; Weder, Christoph ; Eichhorn, Stephen J. / Stress transfer in cellulose nanowhisker composites - Influence of whisker aspect ratio and surface charge. In: Biomacromolecules. 2011 ; Vol. 12, No. 4. pp. 1363-1369.
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