Composition, structure and mechanical properties of several natural cellular materials

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• 作者：ZuoDong Yin (1) (2)
  ZeLin Pan (1)
  Cai Wang (1)
  YuPing Dong (2)
  YuXiang Ou (2)
  
• 关键词：natural foam ; composition ; structure ; mechanical property ; bionic model
• 刊名：Chinese Science Bulletin
• 出版年：2007
• 出版时间：November 2007
• 年：2007
• 卷：52
• 期：21
• 页码：2903-2908
• 全文大小：943KB
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• 作者单位：ZuoDong Yin (1) (2)
  ZeLin Pan (1)
  Cai Wang (1)
  YuPing Dong (2)
  YuXiang Ou (2)
  
  1. Beijing National Laboratory for Molecular Sciences (BNLMS), New Materials Laboratory, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, China
  2. Beijing Institute of Technology, Beijing, 100081, China
  
• ISSN：1861-9541

文摘

The stem piths of sunflower, kaoliang and corn are natural cellular materials. In this paper, the contents of the compositions of these piths are determined and their cell shapes and structures are examined through scanning electron microscope (SEM) and optical microscope. Further research is conducted in the effects of the compositions and structures of the piths on the mechanical properties after testing the partial mechanical properties. The results show that the total cellulose, hemicelluloses and lignin content of each sample approaches 75% of the dry mass of its primary cell walls. With the fall of R value, a parameter relative to the contents of the main compositions, the flexibilities of the cellular piths descend while their stresses and rigidities increase. The basic cell shape making up the sunflower pith is approximately a tetrakaidehedron. The stem piths of kaoliang and corn are made up of cells close to hexangular prisms and a few tubular ones which can observably reinforce their mechanical properties in the axial directions.