Fabrication of Crack-Free Flattened Bamboo and Its Macro-/MicroMorphological and Mechanical Properties  

作　　者：Zhichao Lou Tiancheng Yuan Qiuyi Wang Xinwu Wu Shouheng Hu Xiaomeng Hao Xianmiao Liu Yanjun Li 

机构地区：[1]College of Materials Science and Engineering,Nanjing Forestry University,Nanjing,210037,China [2]Key Laboratory of National Forestry and Grassland Administration/Beijing for Bamboo&Rattan Science and Technology,Beijing,100102,China [3]International Center for Bamboo and Rattan,Beijing,100102,China

出　　处：《Journal of Renewable Materials》2021年第5期959-977,共19页可再生材料杂志（英文）

基　　金：This research was funded by Financial support from the National Natural Science Foundation of China(Nos.61601227,31971740);China Postdoctoral Science Foundation(2017M621598);Nature Science Foundation of Jiangsu Province(BK20160939);Key University Science Research Project of Jiangsu Province(17KJA220004);Jiangsu Agricultural Science and Technology Independent Innovation Project(CX(18)3033);Science and Technology Program of Fujian Province(2019N3014);Open Fund of Key Laboratory of National Forestry and Grassland Administration/Beijing for Bamboo&Rattan Science and Technology(ICBR-2020-08).

摘　　要：This work aimed to help the bamboo industry develop methodology for producing imperfection-free bamboo boards that can serve either decorative or structural benefit to consumers seeking to engage with the bioeconomy.Specifically,softened and slotted bamboo tubes were handled by a roller device with nails to render crack-free flattened bamboo board.Softening temperature and time were optimized herein according to findings regarding chemical composition and board mechanical properties.The optimal softening parameters for saturated steam heat treatment is proved to be 160°C for 8 min.The flattened bamboo board possesses an increased bending strength of 101.5 MPa and a decreased bending modulus of 7.7 GPa,being compared with only-softened bamboo.The corresponding changing mechanism is determined in-depth by the micro-morphological and mechanical results based on in-situ SEM and AFM technologies.Under the action of nails and rolling processes,the bamboo texture becomes compact with crushed and fragmented conduit walls.The resulting cell cavity then becomes stretched and compressed,taking on a morphology which allows for the mechanical penalties associated with flattening to be avoided.According to the micro-mechanical results obtained by AFM,compared with unflatten bamboo,the Young’s modulus of the cell membrane in transverse direction(YT)decreases to 1.00 GPa while the corresponding Young’s modulus in radial direction(YR)increases to 7.29 GPa.

关 键 词：Flattened bamboo board saturated steam heat treatment macro-mechanics in-situ atomic force microscopy young’s modulus MICROMORPHOLOGY 

分 类 号：TG1[金属学及工艺—金属学]