Strong, Durable, and Aging-Resistant Bamboo Composites Fabricated by Silver <i>In Situ</i> Impregnation

Ju, Zehui; Zhan, Tianyi; Zhang, Haiyang; He, Qian; Hong, Lü; Yuan, Man; Cui, Jianxin; Cheng, Liangsong; Lü, Xin

doi:10.1021/acssuschemeng.0c06050

Cited by 32 publications

(13 citation statements)

References 51 publications

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“…Thus, the resistance to creep of treated bamboo cell walls was enhanced due to the degradation of polymers in cell walls. In addition, the recondensation of lignin and increased cellulose crystallinity index may also have contributed to this observation [ 38 , 39 , 40 , 41 ].…”

Section: Resultsmentioning

confidence: 99%

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%

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

et al. 2022

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“…In other word, the bamboo parenchyma cell walls deformed and distorted due to the external pressure and high temperature. This is because the high pressure and high-temperature condition degraded the main chemical composition in the bamboo cell walls, resulting in this deformation [ 27 , 28 , 29 ]. The flattening process compressed the parenchyma cell without obvious cell wall failure in comparison to the untreated bamboo specimen due to the viscoelastic nature of bamboo.…”

Section: Resultsmentioning

confidence: 99%

Study on Bamboo Longitudinal Flattening Technology

et al. 2022

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In this paper, we introduced a bamboo longitudinal flattening technology and analyzed the effects of the softening–flattening process on the physical and mechanical properties of moso bamboo. This is a newer bamboo processing technology that can enhance the utilization and reduce pollution compared with traditional bamboo-based products. Results showed that the parenchyma cells distorted and compacted due to the flattening process. The hemicellulose and cellulose content decreased, while the content of lignin presented an increasing tendency. As expected, the dimensional stability of moso bamboo enhanced due to the decrement of hemicellulose. The softening–flattening process positively contributed to the micro-mechanical properties of treated bamboo specimens. For example, the hardness and modulus of elasticity of the untreated bamboo sample increased from 0.58 and 15.7 GPa to 0.8 and 17.5 GPa, respectively. In addition, the changes in cellulose crystallinity and mechanical properties were also investigated in this paper. The cellulose crystallinity increased from 37.5% to 43.2%, significantly. However, the modulus of rupture of the flattened bamboo board decreased from 9000 to 7500 MPa due to the grooves made by the flattening roller. The MOE of flattening bamboo board showed the same decreasing tendency.

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“…In addition, by comparing the C 1s of UF and 2.5% Sp-UF resin shown in Figure 6 b, the high-resolution spectrum of the UF resin can be resolved into five peaks at 284.8, 286.7, 287.2, 287.8, and 288.8 eV, corresponding to the C−H, C−N, C−O, C=O, and −N−CO−N− components. In contrast, with the coupling of the Span 80 surfactant, there is a significant increase of the peak at 284.8 and a new peak at 288.6, which can be identified as the signals of the C−H and O−C=O groups of the Span 80, respectively [ 42 , 43 , 44 ]. This demonstrates that Span 80 is coupled with the UF resin.…”

Section: Resultsmentioning

confidence: 99%

Surfactant-Induced Reconfiguration of Urea-Formaldehyde Resins Enables Improved Surface Properties and Gluability of Bamboo

Liang

Zheng

et al. 2021

Polymers

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The high-efficiency development and utilization of bamboo resources can greatly alleviate the current shortage of wood and promote the neutralization of CO2. However, the wide application of bamboo-derived products is largely limited by their unideal surface properties with adhesive as well as poor gluability. Herein, a facile strategy using the surfactant-induced reconfiguration of urea-formaldehyde (UF) resins was proposed to enhance the interface with bamboo and significantly improve its gluability. Specifically, through the coupling of a variety of surfactants, the viscosity and surface tension of the UF resins were properly regulated. Therefore, the resultant surfactant reconfigured UF resin showed much-improved wettability and spreading performance to the surface of both bamboo green and bamboo yellow. Specifically, the contact angle (CA) values of the bamboo green and bamboo yellow decreased from 79.6° to 30.5° and from 57.5° to 28.2°, respectively, with the corresponding resin spreading area increasing from 0.2 mm2 to 7.6 mm2 and from 0.1 mm2 to 5.6 mm2. Moreover, our reconfigured UF resin can reduce the amount of glue spread applied to bond the laminated commercial bamboo veneer products to 60 g m−2, while the products prepared by the initial UF resin are unable to meet the requirements of the test standard, suggesting that this facile method is an effective way to decrease the application of petroleum-based resins and production costs. More broadly, this surfactant reconfigured strategy can also be performed to regulate the wettability between UF resin and other materials (such as polypropylene board and tinplate), expanding the application fields of UF resin.

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Strong, Durable, and Aging-Resistant Bamboo Composites Fabricated by Silver In Situ Impregnation

Cited by 32 publications

References 51 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 Bamboo Longitudinal Flattening Technology

Surfactant-Induced Reconfiguration of Urea-Formaldehyde Resins Enables Improved Surface Properties and Gluability of Bamboo

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