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Zheng, Z.; Yan, N.; Lou, Z.; Jiang, X.; Zhang, X.; Chen, S.; Xu, R.; Liu, C.; Xu, L. Modification and Application of Bamboo-Based Materials. Encyclopedia. Available online: https://encyclopedia.pub/entry/51657 (accessed on 19 May 2024).
Zheng Z, Yan N, Lou Z, Jiang X, Zhang X, Chen S, et al. Modification and Application of Bamboo-Based Materials. Encyclopedia. Available at: https://encyclopedia.pub/entry/51657. Accessed May 19, 2024.
Zheng, Zhiyu, Nina Yan, Zhichao Lou, Xizhi Jiang, Xiaomei Zhang, Shan Chen, Rui Xu, Chun Liu, Lei Xu. "Modification and Application of Bamboo-Based Materials" Encyclopedia, https://encyclopedia.pub/entry/51657 (accessed May 19, 2024).
Zheng, Z., Yan, N., Lou, Z., Jiang, X., Zhang, X., Chen, S., Xu, R., Liu, C., & Xu, L. (2023, November 16). Modification and Application of Bamboo-Based Materials. In Encyclopedia. https://encyclopedia.pub/entry/51657
Zheng, Zhiyu, et al. "Modification and Application of Bamboo-Based Materials." Encyclopedia. Web. 16 November, 2023.
Modification and Application of Bamboo-Based Materials
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This entry is adapted from the peer-reviewed paper 10.3390/f14112219

In light of continual societal advancement and escalating energy consumption, the pursuit of green, low-carbon, and environmentally friendly technologies has become pivotal. Bamboo, renowned for its diverse advantages encompassing swift growth, ecological compatibility, robust regenerative properties, commendable mechanical characteristics, heightened hardness, and abundant availability, has discovered applications across various domains, including furniture and construction. Nevertheless, natural bamboo materials are plagued by inherent limitations, prominently featuring suboptimal hydrophobicity and vulnerability to fracture, thereby constraining their broad-scale application. Thus, the paramount concern is to enhance the performance of bamboo materials through modification.

bamboo sustainability modification

1. Introduction

With the intensification of global climate change and environmental pollution, embracing the path of green, low-carbon, and sustainable development is the inevitable choice for humanity [1][2][3]. As countries around the world impose increasingly stringent requirements on carbon emissions, bamboo resources, often referred to as “carbon-negative” materials, have become notably significant [4][5][6]. The process of bamboo growth itself is a carbon reduction process, as it can absorb carbon dioxide from the air, convert it into carbohydrates through photosynthesis, and release oxygen. Enhancing the utilization value of renewable bamboo forest resources, substituting traditional metals and petrochemical-based functional materials is one of the most feasible methods to reduce carbon emissions, increase carbon sequestration, and maintain atmospheric carbon balance [7].
Bamboo, an intriguing and adaptable natural resource, is distinguished by its swift growth, distinctive structure, and composition. In the realm of production, bamboo showcases remarkable growth rates, with certain species capable of achieving several inches of growth daily. Consequently, bamboo lends itself to sustainable harvesting, and its production cycle notably outpaces that of many other materials. This attribute underpins its standing as a readily renewable resource [8]. The structure of bamboo is a key component of its appeal. It comprises hollow segments, or “culms”, joined by nodes, providing flexibility and strength. This segmented structure is not only aesthetically pleasing but also offers exceptional mechanical properties, making it a favored choice in construction and engineering [9][10][11][12][13][14]. The composition of bamboo includes cellulose, hemicellulose, and lignin, similar to traditional hardwoods [15]. However, the proportion of these components can vary by species. The high cellulose content contributes to its strength, while lignin enhances its durability and resistance to pests and decay. The unique combination of these constituents is part of what makes bamboo a valuable resource for various applications. The remarkable production rate, segmented structure, and versatile composition of bamboo make it a valuable and sustainable resource. Its unique qualities have led to a wide range of applications, from construction and furniture to textiles and eco-friendly products. Bamboo’s prominence as a renewable and adaptable material underscores its significance in addressing environmental and industrial challenges.
However, certain inherent characteristics of natural bamboo materials impose limitations on their applications. Firstly, due to the presence of numerous free hydroxyl groups and their porous structure, natural bamboo materials tend to absorb moisture, resulting in poor dimensional stability [16][17]. This property implies that, under humid or wet conditions, bamboo materials are prone to expansion or contraction, which is adverse for various applications such as construction and furniture manufacturing that demand superior dimensional stability. Secondly, natural bamboo materials exhibit relatively low resistance to biological factors, making them susceptible to fungal, bacterial, and pest attacks [18]. This susceptibility can lead to bamboo decay or degradation, ultimately reducing their lifespan. Lastly, the mechanical properties of natural bamboo materials are relatively unstable due to their porous structure. Different parts of bamboo may exhibit varying mechanical properties, and even within the same bamboo pole, a gradual decrease in strength can be observed from the outer to inner sections [19][20]. These drawbacks collectively contribute to a reduced lifespan of natural bamboo materials and limit their range of applications. Therefore, it becomes essential to subject natural bamboo materials to appropriate treatments to meet the diverse requirements of various applications.
Researchers have been actively engaged in innovative bamboo-based material modification studies, imparting entirely new characteristics and performance capabilities to bamboo. This enables bamboo to serve as a versatile alternative to traditional petroleum-dependent derivative materials. This exploration in the field is primarily driven by sustainability considerations, aiming to propel the development of green materials and eco-friendly products. In recent years, novel modification methods (heat treatment, chemical modification, plasma, and microwave modification etc.) have continuously emerged in the research field with the aim of imparting bamboo with multifunctionality and superior performance [21][22][23]. For instance, Feng et al. subjected 4-year-old Moso bamboo to superheated steam treatment at 160–220 °C for 1.5 h, resulting in improved hydrophobicity and dimensional stability of the bamboo [24]. Huang et al. employed a chemical modification method that combined vinyl acetate acetylation and methyl methacrylate in situ polymerization. The results indicated an enhancement in the dimensional stability, thermal stability, and wettability of the modified bamboo [25]. These innovative methods include enhancing bamboo fiber strength, improving its water resistance, and increasing its stability, thereby expanding the scope of bamboo’s applications in areas such as construction, materials science, and environmental engineering. This potential for multifunctionality further solidifies bamboo’s role in sustainable development and the realm of green materials.

2. Thermal Treatment

Bamboo heat treatment can be categorized based on the heat transfer medium used. It includes steam heat treatment, oil heat treatment, and air or inert gas heat treatment. Among these, steam heat treatment and oil heat treatment have gained significant popularity in both research and industry [18].

2.1. Steam Heat Treatment

Steam heat treatment involves using steam as a medium to treat bamboo. Steam serves the dual purpose of softening bamboo and isolating it from oxygen exposure. Depending on the specific characteristics of steam, steam heat treatment can be further categorized into saturated steam treatment and superheated steam treatment. Saturated steam is generated when the evaporation and condensation processes are in dynamic equilibrium during water evaporation. It is characterized by a one-to-one correspondence between temperature and pressure. Saturated steam, due to its remarkable penetrating ability and capacity to lower the glass transition temperature, can soften bamboo at relatively low temperatures while minimizing the reduction in bamboo’s mechanical properties. Notably, saturated steam heat treatment is highly efficient and environmentally friendly, making it one of the foremost methods for bamboo modification in the realm of heat treatments [26][27][28].

2.2. Oil Heat Treatment

Oil heat treatment is a crucial method for bamboo thermal modification, employing vegetable oils like tung oil, linseed oil, palm oil, or mineral oils such as methyl silicone oil as the heat transfer medium [29][30][31][32][33]. Firstly, it achieves efficient heat transfer, ensuring uniform heating throughout the material, thus avoiding issues of temperature irregularities. Additionally, it enables precise temperature control, allowing researchers to finely adjust treatment temperatures as needed for optimal results. This multifunctional and widely applicable method has gained significant attention in the field of bamboo modification.
For example, the impact of methyl silicone oil at different temperatures (140 °C to 200 °C) and various durations (2 h to 6 h) on the chemical composition, physical-mechanical properties, surface wettability, corrosion resistance, and mold resistance of bamboo was systematically investigated by Hao et al. Under the conditions of 2 h of oil heat treatment at 160 °C, the bamboo exhibited the highest parallel grain compressive strength, reaching up to 109.52 MPa, which is 18.63% higher than that of untreated samples. The reason for this performance improvement may be due to the increased crosslinking of lignin polymer during heat treatment. When held at 180 °C for 2 h, the bamboo demonstrated its highest flexural strength and modulus of elasticity values, reaching 142.42 MPa and 12,373.00 MPa, respectively, which was caused by the decreased moisture content at the fiber saturation point and the improved dimensional stability. Finally, as the heat treatment temperature and duration increased, the mechanical properties of bamboo were reduced because the content of cellulose and hemicellulose gradually decreased owing to its poor thermal stability, while the material’s resistance to corrosion and mold resistance significantly improved due to the blocked internal channels for nutrient exchange, decreased surface wettability, and the degradation of polysaccharides and starch [32]. Similarly, the influence of thermal oil treatment on the physical-mechanical properties of three Philippine bamboo species was investigated by Manalo et al. The findings revealed that thermal oil treatment led to improvements in water absorption and thickness expansion properties for all three Philippine bamboo species [29]. These studies provide comprehensive process parameters and microscopic mechanisms for bamboo oil heat treatment performance, offering practical guidance for production.

2.3. Air or Inert Gas Heat Treatment

Apart from steam and oil, air or inert gases, like nitrogen, can be utilized as heat transfer media in bamboo thermal treatment [34][35][36]. Zhang et al. conducted four cycles of thermal treatment on bamboo in the air, involving seven temperature levels (100 °C to 220 °C) and durations ranging from 1 to 4 h. The results revealed that bamboo experienced an increase in mass loss with rising temperature and extended treatment time, with a maximum reduction of 29.0%. Interestingly, at temperatures below 200 °C, the elastic modulus (MOE) of the samples was minimally affected, and in some cases, it even showed a slight increase compared to the control samples [37]. In contrast, Nguyen et al. conducted thermal treatment of bamboo in a nitrogen atmosphere to enhance its durability and dimensional stability [38]. The treatment in the air showed a significant dark color at 170 °C, while the sample treated with nitrogen did not show this change until 190 °C. This is because nitrogen is an inhibiting gas, and the pyrolysis ratio is very low, so there is little change in color. When the temperature reaches 210 °C, all the bamboo strips showed a deep red color. At the same time, the color is easy to change under oil treatment, which is caused by the filling of oil molecules on the surface of the bamboo. These findings suggest that bamboo thermal treatment holds significant potential for enhancing bamboo quality.

3. Chemical Modification

Chemical modification, a sophisticated approach, entails the utilization of chemical reactions to intentionally transform the chemical composition of bamboo [39][40][41]. Techniques like alkali and acid treatments, acetylation and in-situ polymerization are employed in this process, enabling precise control over the material’s characteristics. These modification methods can significantly boost bamboo strength, making it more robust and durable. Moreover, they enhance its resistance to water, which is particularly crucial for applications where moisture resistance is vital. Additionally, chemical modification increases bamboo resistance to chemical corrosion, making it suitable for harsh environments. Beyond these mechanical and chemical improvements, chemical modification also holds the potential to modify the surface properties of bamboo, rendering it more compatible with various materials and broadening its scope of application possibilities. This versatility and adaptability of chemically modified bamboo make it a promising contender in the realm of advanced materials.
For example, Chen et al. investigated the effects of alkali treatment on the microstructure, chemical composition, and thermal properties of bamboo parenchyma cells and fibers. The results showed that alkali treatment could partially remove lignin from the parenchyma cells but had little effect on the hemicellulose content, while both lignin and hemicellulose were removed from the fibers [42]. Similarly, their team also examined the effects of alkali treatment on the properties of individual bamboo fibers. Studies showed that alkali treatment with low NaOH concentration (lower than 10%) improved the wettability and thermal stability of bamboo fiber [43]. Wang et al. employed furfuryl alcohol (FA) as a modifier and maleic anhydride (MA) as a catalyst in their study. They prepared various bamboo samples with different levels of FA addition (10 wt%, 20 wt%, and 30 wt%). Detailed investigations were conducted on the physical-mechanical properties of the materials, including weight percent gain (WPG), water uptake (WU), thickness swelling (TS), modulus of rupture (MOR), and modulus of elasticity (MOE). Furthermore, the resistance to decay of both the original bamboo and furfurylated-bamboo samples was studied. The results revealed that FA resin was incorporated into the bamboo and successfully polymerized within the bamboo cell walls. When the FA content reached 30 wt%, significant improvements were observed in all physical properties. Furfurylated bamboo exhibited enhanced thermal stability and decay resistance compared to the original bamboo. Notably, after treatment with 30% FA, furfurylated bamboo experienced only a 5.3% mass loss, reaching a high level of decay resistance [44].
In order to enhance the mildew resistance of bamboo, Chen et al. modified citral and applied it to bamboo processing [45]. The results showed that the resistance rate of modified bamboo to common mold could reach 100%. Similarly, Fan et al. introduced cinnamaldehyde into bamboo by in situ Mannich reaction, which improved the surface hydrophobicity of bamboo and effectively resisted the erosion of mold [46]. Sun et al. employed N-methylol acrylamide (NMA), a cross-linking monomer with dual functional groups, for the modification of bamboo to enhance its resistance to mold. When the monomer concentration reached 6% or higher, the surface of NMA-treated bamboo exhibited no fungal growth. The main reasons for the improvement of the resistance to mold were the coating effect of PNMA on starch and the antibacterial property of PNMA. Notably, the thermal stability of bamboo remained relatively unchanged before and after modification. The results further indicated that the mechanical properties of modified bamboo increased by approximately 50%, primarily due to the denser cell wall structure achieved under neutral reaction conditions. In summary, in situ polymerization of NMA presents a promising modification method with broad application potential [47]. Dong et al. used citric acid (CA) and 1,2,3,4-butanetetracarboxylic acid (BTCA) to chemically modify bamboo strips. The results showed that the esterification reaction between CA/BTCA and bamboo components not only improved the mildew resistance and termite resistance of bamboo but also improved the dimensional stability and thermal stability of bamboo [48].

4. Impregnation Modification

Impregnation modification involves soaking bamboo in specific chemical liquids to allow it to absorb the modifiers. This process can enhance bamboo resistance to corrosion, cracks, and improve its overall appearance. Impregnation modification can also be employed to confer bamboo with fire resistance, insect repellent properties, energy storage, and other special characteristics, making it suitable for various specialized applications [49][50][51][52].
For example, Rao et al. employed three techniques to address the cracking issue of bamboo: impregnation with a polyethylene glycol (PEG)-1000 solution, heat treatment using paraffin alone, and a combination of PEG impregnation and paraffin heat treatment (PEG-PH). The treated bamboo specimens were subjected to a 26-week exposure period to assess crack development. Results revealed that cracks began appearing in the PEG-PH treated bamboo after 22 weeks, whereas the control group exhibited cracking after only 2 weeks. As for the mechanism, PEG can diffuse into the fresh bamboo through the concentration difference instead of water, providing the bamboo with dimensional stability, while the paraffin can form a protective layer on the surface of the bamboo, protecting it from water and moisture. Hence, combining PEG impregnation with paraffin heating proves to be an effective and viable method to prevent bamboo cracking [53]. Su et al. prepared a hydrophobic rosin ethanol solution and impregnated bamboo with vacuum pressure at room temperature to improve the limitations caused by bamboo hydrophilicity. After rosin treatment, the water absorption of bamboo decreased by 24.7%, and the radial and tangential expansion coefficients of bamboo from air drying to water saturation decreased by 23.11% and 21.36%, respectively. After rosin treatment, the surface wettability of bamboo is reduced, and the contact angle is 93°, indicating that hydrophobicity is greatly increased, which is beneficial to its application in building materials [54]. 

5. Plasma Modification

Plasma modification is an advanced technique used to enhance the surface characteristics of bamboo through plasma treatment. This process can improve its wettability, enhance adhesion, and refine dyeing capabilities, among other benefits. Plasma modification allows for the customization of bamboo’s surface properties, making it suitable for more sophisticated applications [55][56].
For example, oxygen plasma technology was employed by Rao et al. to functionalize carbonized and non-carbonized bamboo surfaces for the production of advanced bamboo composite materials. Oxygen plasma treatment effectively induced surface oxidation and the formation of oxygen-containing groups, leading to significant alterations in the surface structure of bamboo. This treatment greatly enhanced the surface wettability and interface bonding strength of bamboo, resulting in remarkable improvements in its physical and mechanical properties as a composite material. Specifically, the modulus of MOR reached 170 MPa after treatment, increasing by 47% compared to untreated bamboo composites [57]. However, plasma treatment has timeliness; that is, the bamboo surface will gradually return to the original state after treatment, so it is necessary to minimize the delay between plasma treatment and further processing. Peng et al. applied silver nanoparticles onto bamboo pulp fabric that had undergone plasma pretreatment and conducted a series of characterizations. The results revealed that, when compared to silver nanoparticles applied to bamboo pulp fabric without plasma pretreatment, the plasma-treated bamboo pulp fabric exhibited a higher deposition of silver nanoparticles. These nanoparticles were evenly distributed across the bamboo pulp fabric. Furthermore, the bamboo pulp fabric coated with silver nanoparticles following plasma pretreatment displayed excellent UV protection capabilities, strong resistance to laundering, and hydrophobic properties [58]. The laminated bamboo lumber (LBL) with superior performance through different forming methods were selected by Wu et al., followed by O2 plasma modification. With O2 plasma modification times of 6 min and 12 min, the wet bonding strength of LBL products increased by 58.58% and an impressive 75.69% when compared to conventional plywood. Additionally, the wettability of both green bamboo and yellow bamboo significantly improved following O2 plasma modification [56].

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Subjects: Materials Science, Paper & Wood
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Zhiyu Zheng
,
Nina Yan
,
Zhichao Lou
,
Xizhi Jiang
,
Xiaomei Zhang
,
Shan Chen
,
Rui Xu
,
Chun Liu
,
Lei Xu
View Times: 501
Revisions: 2 times (View History)
Update Date: 16 Nov 2023
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