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Journal of Renewable Materials
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DOI: 10.32604/jrm.2024.054076

ARTICLE

Chemically Modified Sugarcane Bagasse for Innovative Bio-Composites. Part One: Production and Physico-Mechanical Properties

Peyman Ahmadi1,*, Davood Efhamisisi1,*, Marie-France Thévenon2,3, Hamid Zarea Hosseinabadi1, Reza Oladi1 and Jean Gerard2,3

1Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University College of Agriculture and Natural Resources, University of Tehran, Karaj, 3158777871, Iran
2CIRAD, UPR BioWooEB, Montpellier, F-34398, France
3BioWooEB, University of Montpellier, CIRAD, Montpellier, F-34398, France
*Corresponding Authors: Peyman Ahmadi. Email: ahmadi.p@ut.ac.ir; Davood Efhamisisi. Email: efhami@ut.ac.ir
Received: 18 May 2024; Accepted: 21 August 2024; Published: 23 October 2024

Abstract: Sugarcane bagasse is an agro-waste that could replace timber resources for the production of bio-composites. Composite boards such as particleboard offer an issue for the use and recycling of poor quality timber, and these engineered products can overcome some solid wood limitations such as heterogeneity and dimension. Bagasse offers an alternative to wood chips for particleboard production but present some disadvantages as well, such as poor physico-mechanical properties. To address these issues, bagasse fibers were treated with an innovative natural resin formulated with tannin and furfural. Impregnated particles with different concentrations of resin (5%, 10%, and 15% m/m) were exposed to temperatures of 40°C, 60°C, 80°C, and 100°C for resin curing. Various types of tannin-based adhesives, including tannin formaldehyde, tannin/formaldehyde-furfural, and tannin hexamine, were utilized for bonding the treated bagasse particles. The resultant panels were assessed for their physical and mechanical properties and compared to those produced using Melamine-Urea-Formaldehyde (MUF) adhesive. The density of the panels varied from 650 to 730 kg/m3 depending on the resin concentration. The values for both modulus of elasticity and modulus of rupture increased as the resin concentration increased. The internal bonding values exhibited an increase with resin concentration up to a critical point, after which a decreasing trend was observed. The water absorption and thickness swelling were significantly reduced with an increase in resin concentration. However, the panels produced using MUF adhesive yielded the most favorable physico-mechanical properties. Additionally, the panels made with tannin-based adhesives met the minimum requirements specified in the standard EN 312 (specifications for uncoated resin-bonded particleboards) for application in dry conditions. The analysis of formaldehyde emissions indicated that panels produced with tannin-based adhesives exhibited significantly lower emissions compared to those made with MUF. The tannin/furfural resin showed great potential for improving the quality of bagasse particleboard using tannin-based adhesives.

Keywords: Sugarcane bagasse; particleboard; tannin; furfural; physico-mechanical properties; formaldehyde

Nomenclature

FE | Formaldehyde Emission
IB | Internal Bonding
m/m | Mass Percentage
MC | Moisture Content
MOE | Modulus of Elasticity
MOR | Modulus of Rupture
MUF | Melamine-Urea-Formaldehyde
PF | Phenol Formaldehyde
RH | Relative Humidity
TF | Tannin-Formaldehyde
TFFu | Tannin-Formaldehyde-Furfural
TH | Tannin Hexamine
TS | Thickness Swelling
v/v | Volume Percentage
WA | Water Absorption
WPG | Weight Percentage Gain

1  Introduction

Wood-based composites are common substitutes for solid wood in today’s building structures, furniture, and other applications due to their advantages over solid wood [1]. Due to its nature, structure and lignocellulosic composition, wood is of limited dimensions, hygroscopic, can be dimensionally unstable in uncontrolled environments and is also prone to degradation to different extents by various biotic and abiotic agents depending on its service condition [2]. To address this challenges and promote the use and upcycling of low-quality timber, various wood-based composites can be manufactured in desirable sizes with increased dimensional stability and homogeneous properties [3]. Among the diverse range of composites, the demand for particleboard panels is growing [4]. However, the challenge of supplying enough woody raw materials for particleboard production has led manufacturers to seek alternative sources, especially in countries with limited wood supplies but abundant other lignocellulosic biomasses [5].

In Iran, limited access to wooden raw materials, due to (i) a ban on supply from natural forests, (ii) a shortage of plantation wood, (iii) limited imports, is one of the main challenges facing the wood industry [6]. Consequently, agricultural wastes could provide a renewable and environmentally friendly alternative to meet the domestic demand [7]. Sugarcane bagasse, a pulpy fibrous material, is one of the world’s largest agricultural residues, with 513 million tons produced each year and is widely available in Iran [8]. Bagasse remains after the sugarcane crushing process and has various uses, including in paper and panelboard manufacturing, animal feed, fertilizer, and the production of chemicals like furfural [9–12]. However, most of this waste is either burned as fuel or landfilled without further valorization [13–15].

Sugarcane bagasse, a mix of fibers and smooth parenchymatous tissue, is mainly constituted of polysaccharides (cellulose, hemicelluloses) but also contain limited amounts of lignin, wax, and residual sugars. Utilizing bagasse as a raw material for panelboard production is an effective way to repurpose this agro-residue. However, due to the nature, composition and hygroscopicity of bagasse, manufactured panelboards present serious limitations: poor dimensional stability and mechanical resistance, vulnerability to fungal and insect degradation [16–19].

Numerous studies have attempted to improve the physico-mechanical properties of panelboards made from bagasse. Different pretreatments, such as acetylation [20], wax-sizing [21], heat treatment [16,18,22], and soaking in diluted NaOH solution [23], have been applied to achieve favorable results. Impregnation with different natural [24] or synthetic resins [25] is another approach to improve the mechanical properties of wood-based panels while enhancing dimensional stability. In recent years, the use of tannin-based resins with different hardeners to improve the durability and physico-mechanical properties of wood has been extensively studied [26,27]. The potential of an innovative tannin/furfural resin for the impregnation of poplar wood to improve its physical characteristics was evaluated by Ahmadi et al. [28]. It was demonstrated that natural tannin-furfural resin with appropriate viscosity could easily impregnate wood and be transformed into a highly water-resistant polymer.

The purpose of this study is to promote the use of sugarcane bagasse, tannin and furfural, all renewable materials (furfural being itself produced from sugarcane bagasse), to produce long-lasting bagasse particleboards with enhanced physico-mechanical properties. Two different approaches were considered for achieving this objective: the raw bagasse particles were impregnated with natural tannin/furfural resins, and various tannin-based adhesives were employed for the gluing process. The different composites obtained were assessed for their physical properties, and especially their water-related behavior, as well as their mechanical resistance in order to find out the best option process.

2  Materials and Methods

2.1 Material

The bio-based materials utilized for this study were sugarcane bagasse, quebracho tannin, and furfural. Sugarcane bagasse was purchased from Pars Paper Industrial Group (Karaj, Alborz, Iran). Commercial condensed tannins extracted from quebracho (Schinopsis balansae) wood were acquired from Silvateam Co. (Buenos Aires, Argentina). Furfural, prepared from the acid hydrolysis of bagasse, was obtained from Behran Oil Company (Tehran, Iran). The bagasse was air-dried for 14 days and finely ground by Pallmann Maschinenfabrik (Zweibrücken, Rhineland-Palatinate, Germany). Bagasse particles that passed through a 40-mesh sieve and remained on a 60-mesh sieve were used for further processing. Hexamethylenetetramine (hexamine), sodium hydroxide, sodium sulfite, sulfuric acid, and formaldehyde were also supplied by Sigma-Aldrich (St. Louis, MS, USA). The commercial Melamine-Urea-Formaldehyde (MUF) adhesive was purchased from Samed Co. (Mashhad, Razavi Khorasan, Iran).

2.2 Resin Preparation

2.2.1 Pretreatment of Tannin

Depolymerization pretreatment of tannin was performed to facilitate easier access to the functional groups of tannin macromolecules and the opening of pyran rings before adding them to the reaction system with furfural [29,30]. Dry tannin powder was dissolved in a 10% w/w NaOH solution to obtain a 20% w/w tannin solution. The tannin solution was heated to 80°C for 30 min, then 8% w/w sodium sulfite (based on the dry tannin powder weight) was added to the solution and kept at 80°C for another 30 min. The pH of the solution was adjusted to 8 using NaOH (33% w/w) to prevent polycondensation reactions between tannin monomers.

2.2.2 Acid Pretreatment of Furfural

The acid-catalyzed opening of the furan ring was performed by adding 5% v/v sulfuric acid (at 20% v/v) to the furfural and stirring for 20 min at 20°C ± 3°C [31].

2.2.3 Resin Synthesis

The previously obtained tannin aqueous solutions (20% m/m) were prepared under vigorous stirring to add furfural. Subsequently, 50% of furfural (based on the tannin dry weight) was added to the solution. The resin pH was adjusted to 4.5 with NaOH (33% m/m) according to Ahmadi et al. [28].

2.3 Dipping of Bagasse Particles

The prepared tannin/furfural resin at three different concentrations, 5%, 10%, and 15% (m/m based on the dry weight of the resin), was used to treat anhydrous bagasse particles previously oven-dried at 103°C. The bagasse particles were soaked in a bath of resin at atmospheric pressure and room temperature for 12 h. Afterwards, they were air-dried under ambient conditions before being exposed to increasing temperatures for resin curing. For resin curing, the treated bagasse particles were exposed to the following temperature sequence: 40°C, 60°C, 80°C, and 120°C, with each step being held for 24 h. After curing the resin inside the bagasse particles, they were dried at a temperature of 103°C until a constant weight (W2) was reached. The weight percentage gain (WPG) of the bagasse particles was calculated using Eq. (1):

WPG (%)=W2−W1W1×100 (1)

where W1 is the oven-dried weight of the bagasse before dipping, and W2 is the oven-dried weight of the bagasse after dipping and curing. The experiment was conducted with three batches for each resin type.

2.4 Adhesives Synthesis

Three different tannin-based adhesives were used for gluing bagasse particles: tannin-formaldehyde (TF), modified tannin-formaldehyde by furfural (TFFu), and tannin hexamine (TH). To compare the performance of bio-adhesives, MUF was also used as a synthetic adhesive. Tannin was first depolymerized before being used in the adhesive system according to the method described in Section 2.2.1. An aqueous tannin solution (40% m/m) was prepared, and different amounts of hardeners were added as follows:

TF: Formaldehyde with the same molar ratio as tannin

TFFu: Formaldehyde (70% v/v) and pretreated furfural (30% v/v) with the same molar ratio as tannin

TH: 6.5% on tannin extract solids of hexamine (40% m/m aqueous solution) added as a hardener

The solutions were then stirred at 80°C for 30 min. Afterwards, the adhesives were rapidly cooled to room temperature, and the pH was adjusted to 8 with NaOH (33% m/m) solution.

2.5 Particleboard Manufacturing

Particleboards were prepared to the final dimensions of 400 × 400 × 10 mm3 and a target density of 650 kg/m3 (Fig. 1). Each set of particle types (including untreated bagasse as control) and different adhesives (12% w/w based on dry particle weight) were blended using a rotary blender. The blended bagasse particles with adhesive were hot-pressed at 160°C for MUF (8 min) and 190°C for all tannin-based adhesives (12 min), with a pressure of 40 kg/cm². Three boards were produced for each experimental condition (48 boards in total).

Figure 1: Particleboards manufactured using tannin-based adhesive

2.6 Mechanical and Physical Experiments

Particleboards were conditioned at 20°C and 65% Relative Humidity (RH) for 10 days after cutting and sampling. Density and moisture content (MC) tests were performed using samples with dimensions of 5 × 5 × 1 cm3. The MC test was calculated based on the initial and final mass after oven drying for 24 h at 103°C ± 2°C. MC and Density were evaluated using Eqs. (2) and (3), according to EN 323 [32].

MC (%)=M1−M0M0×100 (2)

Density (g/cm3)=M1V1 (3)

where M1 and V1 are the conditioned weight and volume at 20°C, 65% RH; M0 is the anhydrous weight of the samples (at 103°C). The tests were conducted with six repetitions for each panel.

Water absorption (WA) and thickness swelling (TS) after 2 and 24 h of soaking in water were determined based on EN 317 [33]. The bending properties, modulus of rupture (MOR), and modulus of elasticity (MOE) were investigated according to EN 310 [34] by conducting a three-point bending test. The internal bonding (IB) strength was investigated under dry and wet conditions according to EN 319 [35] and EN 312 [36]. The experiments were conducted with twelve replicates for each treatment.

2.7 Formaldehyde Emissions

The formaldehyde emissions from particleboards were measured using the desiccator method according to JIS A 1460 [37]. Particleboard specimens with dimensions of 150 mm (length) × 50 mm (width) × thickness were placed in a desiccator for 24 h at a temperature of 20°C. A Petri dish containing 30 mL of distilled water was also placed inside the desiccator. The formaldehyde emitted from the specimens was absorbed in the water, and its content was determined by a photometric method using the acetylacetone approach [38]. In this method, formaldehyde absorption was measured at 412 nm using a spectrophotometer (VWR® UV-6300PC). This test was repeated three times for each panel type, and the average result was reported.

2.8 Statistical Analysis

Data analysis was performed using a two-way ANOVA in IBM SPSS v. 29 software with a completely randomized design. The independent effects of the resin concentrations and the adhesive type, as well as their interaction, were investigated on the studied features.

3  Results and Discussion

3.1 Bagasse Treatment with Different Resins

For each bagasse treatment type, the values of weight percentage gain (WPG) increased along with the resin concentration (Fig. 2), this being due to the loading of resin with more solid content within the bagasse particles. Similarly, Yang et al. [25] found that the WPG values increased linearly with the phenol formaldehyde (PF) resin concentration when they immersed wood chips in a PF water-soluble resin with concentrations between 4.5% and 10% (m/m). Lin et al. [39] reported that the WPG values of the treated wood strands with PF resin ranged from 7.8% to 37.4% with changes in resin concentration.

Figure 2: Average weight percentage gain (WPG) values of bagasse particles after dipping with tannin/furfural resin

3.2 Moisture Content and Density

The increase in resin concentration resulted in a higher board density and a decrease in its equilibrium moisture content (MC%) (Table 1). However, these differences were not statistically significant (Table 2).

The panels made from treated particles with 5% resin solution had the maximum density value. The treatment of bagasse particles with 10% and 15% resin solutions resulted in panels with lower density than the control panels. This could be due to the much lower bulk density of the bagasse particles treated with 10% and 15% resin solutions, resulting in less compaction of the particles during hot pressing. On the other hand, it seems that the low compression of the particles caused a slight springback in thickness after the hot pressing (Fig. 3). Similarly, Bavaneghi et al. [40] found that particleboards made from acetylated particles developed springback after hot pressing. The density of particleboards at a given process condition is affected by several parameters, particularly the density of the lignocellulosic material [9,41]. Boruszewski et al. [42] found that higher panel mat compaction could be achieved with lower density material by regulating the pressing time and heat transfer.

Figure 3: Thickness profile of bagasse particleboard: (A) control panels (untreated particles); (B–D) panels made from particles treated with 5%, 10%, and 15% tannin/furfural resin, respectively

3.3 Flexural Properties and Internal Bonding

The results demonstrated that the impregnation of bagasse particles had a significant increasing effect on the Modulus of Rupture (MOR) and Modulus of Elasticity (MOE) values of bagasse particleboards (Tables 1 and 2). This can be explained by the increase in density of bagasse particles as a result of saturation with the tannin/furfural resin. Indeed, the resin serves as a filler agent in the interstitial spaces within the bagasse particles, subsequently enhancing the structural integrity and mechanical performance of the resulting particleboards. The rigidity effect of the cured resin on the bagasse fibers could be another reason. The highest value of MOE (5322 MPa) was observed in boards produced with the bagasse particles saturated with a 15% concentration of resin and bonded with MUF adhesive. The lowest values of MOE (1023 MPa) were observed in boards produced with untreated bagasse using TF adhesive. A similar improving trend was also observed for the values of MOR. Under the same conditions, MOR and MOE in boards made with MUF adhesives had better mechanical performance than those made using tannin-based adhesives. This stark contrast in MOE and MOR values emphasizes the importance of proper resin treatment and adhesive selection on the mechanical properties of the resulting panels. In a similar study, Yang et al. [25] investigated the production of water-resistant particleboard for applications in humid interior and outdoor use classes with recycled wood wastes of several tree species. The particles were immersed in water-soluble phenol formaldehyde (PF) resin solutions. The bending strength of the boards made from PF-impregnated particles was higher than those prepared with untreated ones [25].

The treatment of bagasse particles with tannin/furfural resin at a 5% concentration increased the internal bonding (IB) values (Table 1). The particles treated with more concentrated resins (10% and 15%) decreased IB values of the resulting panels compared to the control. The lowest IB value was found in the boards made from treated bagasse particles with 15% resin and TF adhesive (0.22 MPa), while it was highest for the boards made from treated particles with 5% resin (0.33 MPa). Kajita et al. [43] showed that the treatment of particles with PF resin considerably increased IB strength of panels with an increase in resin concentration up to a critical point. An excessive increase in resin concentration diminished the IB values. The mat of the panels (before press) made from the treated bagasse had less thickness, which resulted in less compaction during the hot press stage (Fig. 3). High-density raw materials often reduce the IB values of the particleboards [44,45]. The results indicated that the IB values in the wet condition do not meet the minimum standard allowance for type-P2 panels (IB > 0.4 MPa) with either tannin-based adhesive or MUF. However, some of the produced panels meet the requirements of EN 312 [1] standard for type-P1 panels for interior dry applications (IB > 0.28 MPa: type-P1).

The analysis of variance test showed that the treatment of bagasse particles had a significant effect on the IB of the boards. However, the interaction of resin concentration and adhesive type was not significant (Table 2).

Tannin-based adhesives with different formulas and synthesis processes have been successfully used for the production of interior and exterior grade particleboards [46]. Cesprini et al. [47] used industrial quebracho tannin powder and furfural as a bio-sourced hardener to prepare laboratory-scale single-layer particleboard. The values obtained for IB and MOE met the required standards for P1 panels according to EN 312 [1], but the MOR did not satisfy the requirements. In contrast to the favorable flexural properties observed, the IB values of the panels were found to be unsatisfactory and often fell below the stipulated values for both P1 and P2 panels. Pizzi [48] reviewed the advancement of tannin-based resins and the strategies for their successful commercialization in industry. He emphasized the substantial disparity between creating an adhesive formulation in a controlled laboratory setting and its practical implementation in industrial uses. The mechanical properties of particleboards are influenced not only by the type of adhesive used but also by various other parameters. Raw material density plays a crucial role in determining mechanical resistance [49]. Brito et al. [19] investigated the properties of particleboards made from sugarcane bagasse particles and their results showed that the values of MOR, MOE, and IB reached 692.58, 13.50, and 0.22 MPa, respectively. The values obtained in our research were much higher in terms of MOE and IB, but the values of MOR were observed to be the same [19].

3.4 Thickness Swelling

Fig. 4 illustrates the thickness swelling (TS) of different panels after soaking in water for 2 and 24 h. The results showed that as the soaking period increased, the thickness swelling also increased. By increasing the concentration of the resin solution, the TS values statistically decreased for all adhesive types (Table 2). The primary cause of the reduction in TS is the limited access of water molecules to the hydroxyl groups on the cell walls of bagasse particles that have undergone treatment with tannin/furfural polymer. On the other hand, the tannin/furfural resin is a polar solution capable of entering the micropores in the cell wall and forming covalent bonds with hydroxyl groups, effectively obstructing their interaction with water on a permanent basis [28,50]. The effect of modification of wood particles or fibers on the swelling behavior of panelboard through acetylation with different types of anhydrides has been previously studied [51–53]. According to Fig. 4, the effect of the used adhesive was also significant on the values of TS. The panels with MUF adhesive had higher dimensional stability than those with tannin-based adhesives. The bond quality and the water resistance of the adhesive are the most effective factors on the TS of particleboard [54]. Although the independent effects of adhesive type and resin concentration were significant on TS, their simultaneous effects were not significant (Table 2).

Figure 4: Thickness swelling of different bagasse panels

3.5 Water Absorption

The water absorption (WA) values exhibited an increasing trend as the soaking time was prolonged (Fig. 5). Notably, the panels fabricated using treated bagasse particles demonstrated lower WA values in comparison to those prepared with untreated particles, especially after 24 h of soaking. Higher resin concentrations led to a more pronounced reduction in WA, likely due to the formation of a solid tannin/furfural polymer within the bagasse particle interstices. The WA values for panels using untreated bagasse aligned with those reported by Fiorelli et al. [55] for bagasse panels made with castor oil polyurethane adhesive. Moreover, Mendes et al. [56] concluded that adhesive content, rather than type, primarily influenced WA rates. Statistical analysis indicated that both adhesive types and resin concentration significantly affected WA values after 24 h of water soaking (Table 2).

Figure 5: Water absorption (WA) of different bagasse panels

3.6 Formaldehyde Emission

Fig. 6 illustrates the formaldehyde emission (FE) from bagasse boards manufactured using untreated bagasse and various adhesives. Significant differences in FE levels were observed depending on the adhesive type. Panels bonded with tannin-based adhesives exhibited markedly lower FE compared to those bonded with MUF adhesive. In the case of TFFU, FE was substantially reduced due to a lower formaldehyde ratio, without adversely affecting panel properties. Tannin is often incorporated into amino adhesives as a formaldehyde scavenger to diminish FE, owing to its high reactivity with formaldehyde [57–60]. The panels with the highest and lowest FE values were those bonded with MUF and TH adhesives, respectively. Hexamine, a non-aldehyde hardener, forms –CH2–NH–CH2– bridges between tannin units [61], contributing to the development of panels with negligible formaldehyde emissions [62,63]. Panels bonded with TH adhesive were classified as super zero FE (super E0) according to the formaldehyde emission ranges specified in the JIS A 1460 [37] standard.

Figure 6: Formaldehyde emission from panels produced with different adhesives

4  Conclusion

The aim of this research was to develop particleboards made from bagasse treated with innovative resins formulated based on the complex of tannin and furfural. The treated bagasse particles were bonded using various tannin-based adhesives and compared with those produced using the widely used MUF commercial adhesive. An increase in resin concentration was correlated with improvements in MOE and MOR, and reductions in WA and TS values. However, it was observed that IB values exhibited an optimal improvement trend up to a critical resin concentration of 5%, beyond which performance decreased. The IB values of panels manufactured using tannin-based adhesives were generally inferior to those produced with MUF. Some panels met the minimum standard requirement for indoor general applications according to the IB values. This area warrants further research. Future studies should evaluate the impact of resin content, target board density, and pressing conditions (for higher compaction) on internal quality performance of panels. The use of tannin-based adhesives significantly reduced FE in the panels. These results highlight the potential of tannin-based adhesives in reducing FE, aligning with the growing focus on sustainable and eco-friendly construction materials. In summary, this study provides valuable insights for further research and development in utilizing agricultural residues to produce high-quality, sustainable wood-based panel products.

Acknowledgement: This work was supported by the University of Tehran and the Center for International Scientific Studies and Collaboration (CISSC), as well as Campus France (Paris, France) through the Gundishapur project–Development of Smart Bio-Composites with Innovative Coatings, and CIRAD through specific action for overseas doctoral students.

Funding Statement: This work was supported by the office of vice-president for research and technology, University of Tehran, Gundishapur project 1584/45227SG, and Campus France.

Author Contributions: The authors confirm their contributions to the paper as follows: study conception and design: Peyman Ahmadi, Marie-France Thévenon, Davood Efhamisisi; data collection: Peyman Ahmadi; analysis and interpretation of results: Marie-France Thévenon, Davood Efhamisisi, Peyman Ahmadi, Hamid Zarea Hosseinabadi, Jean Gerard; draft manuscript preparation: Davood Efhamisisi, Peyman Ahmadi, Reza Oladi. All authors reviewed the results and approved the final version of the manuscript.

Availability of Data and Materials: The data that support the findings of this study are available on request from the corresponding authors.

Ethics Approval: This article does not contain any studies involving human or animal participants performed by any of the authors.

Conflicts of Interest: The authors declare that they have no conflicts of interest to report regarding the present study.

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