TY - EJOU
AU - Lou, Zhichao
AU - Yuan, Tiancheng
AU - Wang, Qiuyi
AU - Wu, Xinwu
AU - Hu, Shouheng
AU - Hao, Xiaomeng
AU - Liu, Xianmiao
AU - Li, Yanjun
TI - Fabrication of Crack-Free Flattened Bamboo and Its Macro-/Micro-Morphological and Mechanical Properties
T2 - Journal of Renewable Materials
PY - 2021
VL - 9
IS - 5
SN - 2164-6341
AB - 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. Specifi-
cally, 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 minutes. 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.
KW - Flattened bamboo board; saturated steam heat treatment; macromechanics; in-situ atomic force microscopy; young’s modulus; micromorphology
DO - 10.32604/jrm.2021.014285