Wang Wentian, Lowe Adrian, Kalyanasundaram Shankar
Research School of Engineering, Australian National University, North Road, Canberra 0200, Australia.
Int J Mol Sci. 2015 Mar 17;16(3):6202-16. doi: 10.3390/ijms16036202.
Tensile tests were performed on two different natural fibre composites (same constituent material, similar fibre fraction and thickness but different weave structure) to determine changes in mechanical properties caused by various aqueous chemical treatments and whether any permanent changes remain on drying. Scanning electronic microscopic examinations suggested that flax fibres and the flax/polypropylene interface were affected by the treatments resulting in tensile property variations. The ductility of natural fibre composites was improved significantly under wet condition and mechanical properties (elongation-to-failure, stiffness and strength) can almost retain back to pre-treated levels when dried from wet condition. Preheating is usually required to improve the formability of material in rapid forming, and the chemical treatments performed in this study were far more effective than preheating. The major breakthrough in improving the formability of natural fibre composites can aid in rapid forming of this class of material system.
对两种不同的天然纤维复合材料（组成材料相同、纤维含量和厚度相似但编织结构不同）进行了拉伸试验，以确定各种水性化学处理导致的机械性能变化，以及干燥后是否仍有任何永久性变化。扫描电子显微镜检查表明，亚麻纤维和亚麻/聚丙烯界面受到处理的影响，导致拉伸性能发生变化。天然纤维复合材料在潮湿条件下的延展性显著提高，并且当从潮湿状态干燥时，机械性能（断裂伸长率、刚度和强度）几乎可以恢复到预处理水平。在快速成型中通常需要预热以提高材料的成型性，而本研究中进行的化学处理比预热有效得多。在提高天然纤维复合材料成型性方面的重大突破有助于此类材料系统的快速成型。
