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The effects of thermal treatment of bamboo at 130, 150, 170, and 190°C for 2, 4, and 6 h were investigated in terms of changes in chemical composition, cellulose crystallinity, and mechanical behavior of the cell-wall level by means of wet chemical analysis, X-ray diffraction (XRD), and nanoindentation (NI). Particularly, the reduced elastic modulus ( E  r ), hardness ( H ), and creep behavior were in focus. Both the temperature and treatment time showed significant effects. Expectedly, the hemicelluloses were degraded and the relative lignin content was elevated, while the crystallinity of the cellulose moiety was increased upon thermal treatment. The  E  r  and  H  data of the cell wall were increased after 6 h treatment at 190°C, from 18.4 to 22.0 GPa and from 0.45 to 0.65 GPa, respectively. The thermal treatment led to a decrease of the creep ratio ( C  IT ) under the same conditions by ca. 28%. The indentation strain state ( ε  i ) also decreased significantly after thermal treatment during the load-holding stage.

holzforschung

The effects of thermal treatment on the nanomechanical behavior of bamboo ( Phyllostachys pubescens  Mazel ex H. de Lehaie) cell walls observed by nanoindentation, XRD, and wet chemistry