Effect of high-temperature saturated steam treatment on the physical, chemical, and mechanical properties of moso bamboo

Wang, Xinzhou; Cheng, D. C.-H.; Huang, Xianai; Song, Lulu; Gu, Wenli; Liang, Xingyu; Li, Yanjun; Xu, Bin

doi:10.1186/s10086-020-01899-8

Cited by 58 publications

(24 citation statements)

References 30 publications

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“…Additionally, the several acids formed by the thermal modification can diffuse in the para-crystalline part of cellulose, resulting in its decomposition, causing the crystallinity index of bamboo samples to increase further. Meanwhile, the acids can catalyze the decomposition of hemicellulose resulting in the pyrolysis of the amorphous part of the bamboo which can increase the cellulose crystallinity degree [ 31 , 32 , 33 , 34 , 35 ].…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the intensity of the absorbance peak at 1420 cm −1 changed slightly, illustrating the loss of C=O groups in aromatic skeletal vibration. According to previous literature [ 31 , 32 , 33 ], the absorbance peak at 1420 cm −1 is to be considered unchanged during the thermal modification process. The increment of the spectral region between 1328 cm −1 corresponded to a C-O stretching vibration due to the increment of lignin content.…”

Section: Resultsmentioning

confidence: 99%

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Change in Micro-Morphology and Micro-Mechanical Properties of Thermally Modified Moso Bamboo

et al. 2022

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In recent years, saturated steam heat treatment has been considered as an environmentally friendly and cost-effective modification method compared with traditional heat treatment media. In this study, bamboo was treated by saturated steam, and the change in chemical composition, cellulose crystallinity index, micro-morphology, and micromechanical properties were analyzed by a wet chemistry method, Fourier transform infrared (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), nanoindentation, and so on. Results illustrated that the parenchyma cell walls were distorted due to the decomposition of hemicellulose and cellulose in bamboo samples. As expected, the hemicellulose and cellulose content decreased, whereas the lignin content increased significantly. In addition, the cellulose crystallinity index and thus the micromechanical properties of bamboo cell walls increased. For example, the hardness increased from 0.69 GPa to 0.84 GPa owing to the enhanced crystallinity index and lignin content.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Change in Micro-Morphology and Micro-Mechanical Properties of Thermally Modified Moso Bamboo

et al. 2022

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“…It is necessary to promote the transformation of Phyllostachys pubescens into high-value and biological-based products. In the previous investigation, the research group used the high-temperature saturated steam method to treat bamboo, and mechanically separated the bamboo fiber bundle to obtain it with good performance, while the remaining part of the fiber bundle was wasted because of the complex composition and difficult use [12]. If the resources that should have been discarded can be reused, it is not only in line with sustainability, but can also contribute to the development and utilization of biomass.…”

Section: Introductionmentioning

confidence: 99%

Study on Preparation of Lignin-Containing Nanocellulose from Bamboo Parenchyma

Gu¹,

Zeng²,

Dauletbek³

et al. 2022

Journal of Renewable Materials

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Bamboo vascular bundle fiber and parenchyma (BP) are separated by high-temperature treatment with saturated steam. Bamboo vascular bundle fiber is widely used in the market, but how to develop and utilize parenchyma tissue is a difficult problem. The sulfated cellulose nanofibers (ANFs) were obtained by sulfating BP with a deep eutectic solvent (DES), which provided a theoretical basis for the value-added utilization of BP. Using DES as the reaction medium and reagent, the BP was grafted with a sulfonic acid group to form a gel substance in water, ANFs and nanocellulose gel were obtained by ultrasonic cell crusher. The highest yield of ANFS was 75%. The width of the ANFs was about 3 nm, and a small number of nanofiber aggregates existed at the same time. A high aspect ratio of ANFs, due to their high viscosity, has potential applications as enhancers at low concentrations. Lewis acid (ZnCl 2 ) added based on binary (DES) greatly improved the thermal stability of the ANFs and maintained the crystal form of cellulose I.

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“…High temperature heat treatment refers to modification of biomass in protective gas environment or liquid medium at 160-250 °C [20]. Hemicellulose degrades in high temperature, resulting in a decrease in hygroscopicity and water absorption.…”

Section: Introductionmentioning

confidence: 99%

The effect of oil heat treatment on biological, mechanical and physical properties of bamboo

Hao

Wang

Wang³

et al. 2021

J Wood Sci

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Bamboo is now widely used in construction, papermaking, textile, furniture and other fields because of its renewable, fast-growing, high-strength, high-yield and easy processing. However, compared with wood, bamboo and bamboo products are more vulnerable to damage by fungi and pests. An effective and eco-friendly method is urgently needed to improve their physical and chemical properties, decay resistance and anti-mildew properties, and hydrophobic properties. Here, bamboo was heated with methyl silicone oil. The effect of different temperatures (140 °C–200 °C) and different times (2 h–6 h) on the properties of bamboo was studied systematically, including chemical composition, physical and mechanical properties, surface wettability, decay resistance and anti-mildew property. No starch granules were observed inside the parenchymal cell lumen of bamboo specimen heat treated at 200 °C for 6 h. And with the increase of heat treatment temperature and time, the content of cellulose and hemicellulose decreases gradually while relative content of lignin increases due to its better thermal stability. Accordingly, the surface wettability decreases due to the changes of the surface functional groups and micro-morphologies. Under the condition of oil heat treatment at 160 °C for 2 h, the compressive strength parallel to grain of bamboo samples reach the maximum of 109.52 MPa. With further increase of heating temperature, the corresponding compressive strength decreases. The resulted bending strength and MOE both display similar changing trend. However, the optimal parameter is at 180 °C for 2 h, with the highest bending strength and MOE values of 142.42 MPa and 12,373.00 MPa, respectively. Finally, the decay resistance and anti-mildew property are dramatically enhanced with increased heat treatment temperature and time. All the corresponding changing mechanisms are investigated in depth and in detail. Our results provide comprehensive process parameters and micro-mechanism for the performance of oil heat treatment of bamboo, which can be used to guide the actual production.

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Effect of high-temperature saturated steam treatment on the physical, chemical, and mechanical properties of moso bamboo

Cited by 58 publications

References 30 publications

Change in Micro-Morphology and Micro-Mechanical Properties of Thermally Modified Moso Bamboo

Change in Micro-Morphology and Micro-Mechanical Properties of Thermally Modified Moso Bamboo

Study on Preparation of Lignin-Containing Nanocellulose from Bamboo Parenchyma

The effect of oil heat treatment on biological, mechanical and physical properties of bamboo

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