Publications by authors named "Ranjun Yan"
Preparation and analysis of environment-friendly and high- performance cellulose-based wood adhesive.
Int J Biol Macromol
February 2025
Conventional wood adhesives such as urea-formaldehyde (UF) resin, phenol-formaldehyde (PF) resin, melamine-formaldehyde (MF) resin, and melamine-urea-formaldehyde (MUF) resin have usually problems in formaldehyde emission and derived from petrochemical products, so developing green and environmentally friendly biomass-based wood adhesives has become a research topic of wide focus. As a biomaterial, cellulose (and its derivatives) is the largest bio-resource in the world, and developing its application in wood adhesives synthesis has outstanding raw material advantage. Therefore, in this study, a formaldehyde-free cellulose-based wood adhesive (OCHU) was prepared from carboxymethyl cellulose (CMC) by oxidizing with NaIO and then cross-linked with a laboratory synthetic polyurea compound (HU).
View Article and Find Full Text PDFPreparation and properties of room temperature foaming lignin-based non-isocyanate polyurethane foams.
Int J Biol Macromol
December 2024
Article Synopsis
- Biomass-based non-isocyanate polyurethane (NIPU) is gaining attention in the polyurethane industry for its sustainable materials and lack of toxic isocyanates.
- This study focuses on lignin, a renewable natural polymer, to create lignin-based NIPU (L-NIPU) foams using maleic acid as an initiator and glutaraldehyde as a cross-linker, producing lightweight and strong materials.
- The optimal composition of 18% maleic acid and 25% glutaraldehyde yields foams with significant compressive strength (up to 0.5 MPa) and low thermal conductivity (0.03559 W/m·K), making them suitable for insulation in construction
Article Synopsis
- - The study focuses on creating a new wood adhesive called OCHU, made from oxidized cellulose combined with hexamethylene diamine and urea, which shows high bonding strength and excellent water resistance.
- - To enhance the cellulose, it undergoes enzymatic hydrolysis and oxidation, increasing its solubility and the number of reactive groups, leading to better adhesive properties.
- - The OCHU adhesive proves its effectiveness with significantly improved wet strength—60% stronger than its predecessor (OCH)—and shows potential for widespread use in the plywood industry due to its superior performance.
Starch adhesive is a commonly used bonding glue that is sustainable, formaldehyde-free and biodegradable. However, there are obviously some problems related to its high viscosity, poor water and mildew resistance. Hence, exploring a starch-based adhesive with good properties that satisfies the requirements of wood processing presents the context of the current research.
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