Nanomechanical and Structural Properties of Native Cellulose Under Compressive Stress

详细信息    查看全文

• 作者：Rau虂l Quesada Cabrera ; Filip Meersman ; Paul F. McMillan ; Vladimir Dmitriev
• 刊名：Biomacromolecules
• 出版年：2011
• 出版时间：June 13, 2011
• 年：2011
• 卷：12
• 期：6
• 页码：2178-2183
• 全文大小：863K
• 年卷期：v.12,no.6(June 13, 2011)
• ISSN：1526-4602

文摘

Cellulose is an important biopolymer with applications ranging from its use as an additive in pharmaceutical products to the development of novel smart materials. This wide applicability arises in part from its interesting mechanical properties. Here we report on the use of high pressure X-ray diffraction and Raman spectroscopy in a diamond anvil cell to determine the bulk and local elastic moduli of native cellulose. The modulus values obtained are 20 GPa for the bulk modulus and 200鈥?55 and 15 GPa for the crystalline parts and the overall elastic (Young鈥檚) modulus, respectively. These values are consistent with those calculated from tensile measurements. Above 8 GPa, the packing of the cellulose chains within the fibers undergoes significant structural distortion, whereas the chains themselves remain largely unaffected by compression.