Antonio Pizzi^*

Journal of Renewable Materials, Vol.14, No.7, 2026, DOI:10.32604/jrm.2026.02026-0056 - 28 July 2026

Abstract Cross Polarization Magic Angle Spinning Carbon 13 Nuclear Magnetic Resonance (CP-MAS ¹³C NMR) analysis of commercial procyanidin (pine bark) and delphinidin (pecan nut membranes) condensed flavonoid tannin extracts reacted with hexamethylenetetramine (hexamine) have shown that due to the highly reactive imino-amino methylene species formed before its degradation reaches the generation of formaldehyde, benzylamine bridges between the flavonoid units are formed. This study shows that tannin-based biobenzoxazines are also generated at the same time, with both benzylamines and benzoxazines bridges being in more marked proportions, the more reactive the tannin reacted with hexamethylenetetramine is. This is not More > Graphic Abstract

Pavlo Bekhta^1,2,*, Iryna Lytvyn¹

Journal of Renewable Materials, Vol.14, No.5, 2026, DOI:10.32604/jrm.2026.02026-0035 - 28 May 2026

Abstract The modification of melamine–urea–formaldehyde (MUF) adhesives with lignosulfonates (LS) represents a promising strategy for developing more sustainable wood-based panels. However, the influence of the counterion type remains poorly understood. In this study, the effect of lignosulfonate counterions on adhesives performance and properties of MUF-bonded particleboards was investigated, with a focus on sodium (NaLS) and magnesium (MgLS) lignosulfonates incorporated at 2.5%, 5.0%, and 7.5%. Adhesives performance was characterized by measuring dry solids content, dynamic viscosity, gelation time, and pH. The produced particleboards were evaluated in terms of density, bending strength, modulus of elasticity, internal bond strength… More > Graphic Abstract

Hamed Younesi-Kordkheili^1,*, Antonio Pizzi^2,*, Ghorban Niyatzadeh³

Journal of Renewable Materials, Vol.14, No.4, 2026, DOI:10.32604/jrm.2026.02026-0013 - 24 April 2026

Abstract In this research, an effective method has been developed to bond wood panel adhesives of good performance using biosourced lignin and chitosan as the two main raw materials. Lignin was thus modified by a deep eutectic solvent (DES) and maleic anhydride (MA), respectively. Then DES/MA modified lignin was reacted with glyoxal to obtain a new environmentally friendly lignin-glyoxal (LG) resin. Next, chitosan was added as a bio-crosslinker to the synthesised LG resin. Finally, the performance of the resulting adhesives was evaluated by bonding plywood panels with them. Fourier Transform Infra Red (FTIR) analysis was used… More > Graphic Abstract

Muhammad Ilham Aulia¹, Alifah Syahfitri¹, Imam Busyra Abdillah¹, Abdus Syukur¹, Dede Hermawan^1,*, Rita Kartika Sari¹, Mahdi Mubarok¹, Muhammad Adly Rahandi Lubis², Sukma Surya Kusumah², Sarah Augustina², Jajang Sutiawan^2,*

Journal of Renewable Materials, Vol.14, No.4, 2026, DOI:10.32604/jrm.2025.02025-0160 - 24 April 2026

Abstract Citric acid adhesive is an alternative to formaldehyde-based adhesives that are more environmentally friendly because they are non-toxic and made from natural ingredients. This study aims to determine the effect of variations in citric acid adhesive concentrations on the physical and mechanical properties of jabon plywood. This study used citric acid adhesive with variations in citric acid (CA) concentrations of 59%, 69%, and 79%. Physical property tests include density, moisture content (MC), water absorption (WA), thickness expansion (TS), and delamination, while mechanical tests include modulus of rupture (MOR), modulus of elasticity (MOE), and shear stress… More >

Egidijus Žukauskas^1,*, Damira Smagulova¹, Elena Jasiūnienė^1,2

CMES-Computer Modeling in Engineering & Sciences, Vol.146, No.3, 2026, DOI:10.32604/cmes.2026.077492 - 30 March 2026

Abstract Adhesively bonded joints are widely used in modern lightweight structures due to their high strength-to-weight ratio and design flexibility. However, the reliable non-destructive evaluation of bond integrity remains a significant challenge. This study presents a numerical investigation of adhesively bonded joints with different adhesive properties using ultrasonic guided waves. The main focus of the investigation is to evaluate the feasibility of using guided waves to assess bond integrity, particularly for detecting challenging weak bonds. For this purpose, a theoretical analysis of dispersion curves was conducted, revealing that the S0 Lamb wave mode is significantly sensitive… More >

Belén Rovira^1,*, Aude Chabrelie¹, Sauro Bianchi², Frédéric Pichelin¹

Journal of Renewable Materials, Vol.14, No.3, 2026, DOI:10.32604/jrm.2025.02025-0173 - 25 March 2026

Abstract The construction sector is facing significant challenges in transitioning to a defossilised system. While wood-based products have considerable potential, reliance on adhesives derived from fossil fuels poses significant sustainability concerns. Tannin-based adhesives present a compelling bio-based alternative, offering advantageous bonding properties with the potential to reduce toxicity, minimise fossil resource use, and enhance end-of-life scenarios. Despite extensive research demonstrating the technical potential of tannin-based adhesives, industrial adoption remains limited—partly due to the paucity of studies addressing their environmental impacts. The present study investigates the use of tannin-based adhesives in the production of interior-grade plywood, employing… More >

Francisco Daniel García^1,2, Solange Nicole Aigner^1,2, Natalia Raffaeli³, Antonio José Barotto³, Eleana Spavento³, Mariano Martín Escobar^1,4, Marcela Angela Mansilla^1,4, Alejandro Bacigalupe^1,4,*

Journal of Renewable Materials, Vol.14, No.1, 2026, DOI:10.32604/jrm.2025.02025-0181 - 23 January 2026

Abstract This study explores the use of black soldier fly larvae protein as a bio-based adhesive to produce particleboards from sugarcane bagasse. A comprehensive evaluation was conducted, including rheological characterization of the adhesive and physical–mechanical testing of the panels according to European standards. The black soldier fly larvae-based adhesive exhibited gel-like viscoelastic behavior, rapid partial structural recovery after shear, and favorable application properties. Particleboards manufactured with this adhesive and sugarcane bagasse achieved promising mechanical performance, with modulus of rupture and modulus of elasticity values of 30.2 and 3500 MPa, respectively. Internal bond strength exceeded 0.4 MPa,… More > Graphic Abstract

Hamed Younesi-Kordkheili^1,*, Antonio Pizzi^2,*

Journal of Renewable Materials, Vol.14, No.1, 2026, DOI:10.32604/jrm.2025.02025-0179 - 23 January 2026

Abstract The aim of this research was to synthesize a new totally bio wood adhesive entailing the use of oxidized starch (OST), urea, and oxidized lignin (OL). For this reason, non-modified (L) and oxidized lignin (OL) at different contents (20%, 30%, and 40%) were used to prepare the starch-urea-lignin (SUL) and starch-urea-oxidized lignin (SUOL) resin. Sodium persulfate (SPS) as oxidizer was employed to oxidize both starch and lignin. Urea was just used as a low cost and effective crosslinker in the resin composition. The properties of the synthesized resins and the plywood panels bonded with them… More > Graphic Abstract

Sarah Augustina¹, Ananda Suci Bazhafah², Jajang Sutiawan¹, Sudarmanto¹, Eko Setio Wibowo¹, Nissa Nurfajrin Solihat¹, Alvin Muhammad Savero¹, Ismadi Ismadi¹, Jayadi Jayadi³, Agus Sukarto Wismogroho⁴, Nuniek Ina Ratnaningtyas², Sukma Surya Kusumah^1,*

Journal of Renewable Materials, Vol.13, No.9, pp. 1765-1781, 2025, DOI:10.32604/jrm.2025.02025-0014 - 22 September 2025

Abstract The increasing demand for renewable energy sources has driven the exploration of innovative materials for biofuel production. This study investigates bio-pellet characteristics derived from several oyster mushroom baglog wastes with varying concentrations of molasses as an adhesive. The process began with sun-drying the baglog waste for three days, followed by oven drying at 80°C for 24 h. Bio-pellets were produced by blending baglog waste with molasses at concentrations of 5% and 10% (w/v), then subsequently fed into a pellet mill. The bio-pellets were left to rest for one hour before analysis. The quality of bio-pellets… More > Graphic Abstract

Prosper Mensah¹, Rafael Rodolfo de Melo², Edgley Alves de Oliveira Paula², Alexandre Santos Pimenta³, Juliana de Moura², Fernando Rusch^2,*

Journal of Renewable Materials, Vol.13, No.7, pp. 1475-1489, 2025, DOI:10.32604/jrm.2025.02025-0047 - 22 July 2025

Abstract The increase in wood and wood-based products in the construction and furniture sectors has grown exponentially, generating severe environmental and socioeconomic impacts. Particleboard panels have been the main cost-benefit option on the market due to their lightness and lower cost compared to solid wood. However, the synthetic adhesives used in producing traditional particleboard panels cause serious harm to human health. Developing particleboard panels with fibrous waste and natural adhesives could be a sustainable alternative for these sectors. The work aimed to create particleboards with fibrous wastes from the pseudostem of the banana tree (Musa paradisiaca) and… More > Graphic Abstract