TY  - EJOU
AU  - Yang, Weijia 
AU  - Yang, Yongli 
AU  - Bi, Wenhe 
AU  - Chen, Mengdi 
AU  - Che, Zhongqiang 
AU  - Charrier, Bertrand 
AU  - Essawy, Hisham 
AU  - Pizzi, Antonio 
AU  - Zhou, Xiaojian 
AU  - Chen, Xinyi 

TI  - Phytic Acid Crosslinked Chitosan Adhesive for Wood Composites with Enhanced Water Resistance and Flame Retardancy
T2  - Journal of Renewable Materials

PY  - 
VL  - 
IS  - 
SN  - 2164-6341

AB  - Developing high-performance bio-based wood adhesives to replace conventional petroleum-based adhesives is an urgent issue in the field of wood adhesives. However, existing bio-based adhesives suffer from complex fabrication processes, poor water resistance, and a lack of functionality. Herein, a phytic acid/chitosan adhesive featuring both water resistance and flame retardancy was developed through the one-step dissolution of chitosan. Phosphate esterification and phosphoramidation reactions occurred during hot pressing, as evidenced by FT-IR and XPS analyses, forming a three-dimensional crosslinked network composed of P-O-C and P-N bonds. This crosslinked network effectively enhanced the mechanical properties and water resistance of the resulting adhesive. When 6 g of phytic acid was added, the wet shear strength of the three-layer plywood specimens reached 1.01 MPa, demonstrating excellent water resistance and bonding performance that satisfied the requirements of GB/T 9846-2015 (≥0.7 MPa). Meanwhile, the CS-PA adhesive was applied to bond different wood units (e.g., wood particles). The resulting particleboard exhibited an internal bond strength of 0.66 MPa, a modulus of rupture of 4.16 MPa, and a modulus of elasticity of 920.43 MPa, along with markedly reduced thickness swelling, reflecting a clear improvement in water resistance. In addition, the particleboard achieved a limiting oxygen index (LOI) of up to 54.1% solely through the inherent flame retardancy of the adhesive components, indicating excellent flame-retardant performance. This work offers a straightforward and efficient route for developing high-performance, flame-retardant, environmentally friendly, bio-based wood adhesives.
KW  - Chitosan; phytic acid; wood adhesive; flame retardant; water resistance

DO  - 10.32604/jrm.2026.02026-0050