Changes in bamboo fiber subjected to different chemical treatments and freeze-drying as measured by nanoindentation |
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| Authors: | Xi Yang Lili Shang Xing’e Liu Shumin Yang Genlin Tian |
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| Affiliation: | 1.Department of Biomaterials, International Center for Bamboo and Rattan, Key Laboratory of Bamboo and Rattan Science and Technology,State Forestry Administration,Beijing,People’s Republic of China |
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| Abstract: | The effects of chemical treatments (H2O2 + CH3COOH, acidified NaClO2, and NaOH) and freeze-drying on bamboo fibers were studied at a submicron level, to characterize chemical and mechanical changes to the secondary cell wall. Specifically, a field emission environmental scanning electron microscope (FE-ESEM) and imaging fourier transform infrared spectroscopy (FTIR) were used to demonstrate degradation in morphology and molecular structure, and nanoindentation was used to track changes in micromechanical properties. The results showed that cellular structures after chemical treatments clearly displayed wrinkles, pores, and microfibrils. The decreased bands at 1508 cm-1 and 1426 cm?1 showed that lignin was degraded on treatment of H2O2 + CH3COOH and acidified NaClO2, which directly resulted in a decrease in hardness (H) in the secondary cell wall for treated fibers. In addition, a diminishing peak at 1733 cm?1 caused by NaOH solution indicated that hemicellulose was seriously degraded. It resulted in a decreased modulus (E r) by 13.71 % in bamboo fibers, while no obvious reduction was observed in the first two steps. |
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