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Journal of Materials Science

, Volume 42, Issue 22, pp 9336–9342 | Cite as

Effect of calcium rich and alkaline solutions on the chemical behaviour of hemp fibres

  • David SedanEmail author
  • Cécile Pagnoux
  • Thierry Chotard
  • Agnès Smith
  • Danielle Lejolly
  • Vincent Gloaguen
  • Pierre Krausz
Article

Abstract

Chemical reactivity of hemp fibres placed into a cimentitous matrix was studied by using a lime solution as a simplified cement solution. The hemp fibres contain 56.1 wt.% of cellulose, 20.1 wt.% of pectin, 10.9 wt.% of hemicellulose and 6 wt.% of lignin. These compounds are not solubilised in a basic medium rich in calcium but a part located at the fibre surface should be degraded. This treatment leads also to the decrease of the cristallinity index of the cellulose. Calcium ions adsorb in a large quantity onto the fibre surface due to the high concentration of pectin. The structure of the homogalacturonic part of pectin forms with Ca2+ a stable chelate called “egg-box”, supporting cation adsorption. The fibres are then covered by Ca(OH)2 nodules after immersion in a lime solution.

Keywords

Lignin Hemicellulose Pectin Hemp Natural Fibre 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • David Sedan
    • 1
    Email author
  • Cécile Pagnoux
    • 2
  • Thierry Chotard
    • 1
  • Agnès Smith
    • 1
  • Danielle Lejolly
    • 3
  • Vincent Gloaguen
    • 3
  • Pierre Krausz
    • 3
  1. 1.Groupe d’Etude des Matériaux Hétérogènes, (GEMH, EA 3178), Ecole Nationale Supérieure de Céramique IndustrielleLimoges cedexFrance
  2. 2.Science des Procédés Céramiques et Traitements de Surface, (SPCTS, CNRS UMR 6638), Ecole Nationale Supérieure de Céramique IndustrielleLimoges cedexFrance
  3. 3.Laboratoire de Chimie des Substances Naturelles, (LCSN, EA 1069), Ecole Nationale Supérieure de Céramique IndustrielleLimoges cedexFrance

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