Destructuration of cotton under elevated pressure

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• 作者：Edwige Privas (1)
  Eric Felder (1)
  Patrick Navard (1)
  
• 关键词：Cellulose ; Cotton ; High Pressure ; Microfibrils ; Mechanical properties ; Morphology
• 刊名：Cellulose
• 出版年：2013
• 出版时间：June 2013
• 年：2013
• 卷：20
• 期：3
• 页码：1001-1011
• 全文大小：577KB
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• 作者单位：Edwige Privas (1)
  Eric Felder (1)
  Patrick Navard (1)
  
  1. Mines ParisTech, Centre de Mise en Forme des Matériaux (CEMEF), CNRS UMR 7635, CS 10207, 1 rue Claude Daunesse, 06904, Sophia Antipolis Cedex, France
  
• ISSN：1572-882X

文摘

Dry and wet cotton linters were compressed under elevated pressure in a home-made Bridgman anvil press designed to reach 2.5 GPa and 180?°C. The structural organisation of cotton was changed under the joint action of temperature and pressure. Cotton having high moisture content shows that only a thin surface layer is partially destructured to a compact mat of nanofibres, while the initial cotton fibres are only deformed inside the sample. For dried cotton, the whole sample undergoes a destructuration into a compact mat of nanometre-sized fibres. The mechanical properties were studied by nano-indentation and dynamic mechanical analysis. Compressed dry cotton has higher modulus (10.3 GPa) than wet cotton (6.8 GPa). We postulate that the transverse elastic modulus of cotton microfibrils is around the value of 10 GPa. This work showed that nano-sized fibrils can also be separated in the solid state without flow, and re-compacted to form a solid object.