Effect of Hydrothermal Treatment on the Mechanical and Microscopic Properties of Moso Bamboo

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Effect of Hydrothermal Treatment on the Mechanical and Microscopic Properties of Moso Bamboo


Due to the lack of significant influence over time, studying the influence of temperature is important. Figure 8 shows the infrared absorption spectra of untreated and hydrothermally treated bamboo at different temperatures for 3 h at wave numbers from 4000 to 500 cm−1. The intensity of the hydroxyl stretching vibration absorption peaks at 3425 cm−1 decreased under different temperature treatments compared with untreated bamboo. Treated at 160 °C and 170 °C, given the simultaneous action of high temperature and hydrothermal treatment, the free hydroxyl group of the cellulose molecular chain and glucose in the bamboo processed residue dehydrated to form an ether bond. The intensity of hydroxyl absorption peaks in hydrothermal treatment at 180 °C and, at 190 °C, continued to decrease [33]. This indicated that the carbonization occurred during the carbonization of bamboo and continued to decrease, which showed that dehydration of the bamboo material occurred during carbonization. With an increase in temperature, the C=O vibration peak at 1670 cm−1 was also gradually weakened. The carbonyl absorption peak at 1650 cm−1 corresponded to the lignin-conjugated carbonyl group [34]. After hydrothermal treatment, the absorption peak decreased significantly, mainly because of hydrolysis of the acetyl group after the hydrothermal treatment, resulting in the reduction of the carbonyl group [35]. Meanwhile, the acetyl group produced in the process of the reaction also accelerated the decomposition speed of the carbonyl group to 1270 cm−1 for the C-O-C aromatic ether bond [36]. This is because of the free hydroxyl group between the cellulose molecular chain in the high-temperature condensation reaction, shedding excess water to form the ether bond [37]. An ether bond is formed by the free hydroxyl groups between the cellulose molecular chains under a high-temperature condensation reaction, shedding excess water to form an ether bond. This analysis has shown hydrothermal treatment had no effect on the characteristic cellulose peaks and resulted in a decrease in hemicelluloses and lignin characteristic peaks [28].

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