Size effects on the nanomechanical properties of cellulose I nanocrystals

被引：44
|
作者：
Pakzad, Anahita
Simonsen, John [2 ]
Heiden, Patricia A. [1 ]
Yassar, Reza S. [1 ]
机构：
[1] Michigan Technol Univ, Dept Chem, Houghton, MI 49931 USA
[2] Oregon State Univ, Coll Forestry, Corvallis, OR 97331 USA
来源：
JOURNAL OF MATERIALS RESEARCH | 2012年 / 27卷 / 03期
基金：
美国国家科学基金会;
关键词：
HYDROGEN-BONDING SYSTEM; SYNCHROTRON X-RAY; ELASTIC-MODULUS; CRYSTAL-STRUCTURE; MICROMECHANICAL PROPERTIES; POLYMER CRYSTALS; DYNAMICS; BEHAVIOR; CONTACT; FIBRILS;
D O I：
10.1557/jmr.2011.288
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The ultimate properties of a fibrous composite system depend highly on the transverse mechanical properties of the fibers. Here, we report the size dependency of transverse elastic modulus in cellulose nanocrystals (CNCs). In addition, the mechanical properties of CNCs prepared from wood and cotton resources were investigated. Nanoindentation in an atomic force microscope (AFM) was used in combination with analytical contact mechanics modeling (Hertz model) and finite element analysis (FEA) to estimate the transverse elastic moduli (Et) of CNCs. FEA modeling estimated the results more accurately than the Hertz model. Based on the AFM-FEA calculations, wood CNCs had higher transverse elastic moduli in comparison to the cotton CNCs. Additionally, Et was shown to increase with a reduction in the CNCs' diameter. This size-scale effect was related to the Ia/Ib ratio and crystalline structure of CNCs.
引用
收藏
页码：528 / 536
页数：9
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