Sustainable Bio-Based Wood Adhesive Incorporated Different Functionalized Nanoparticles: A Performance Comparison Study

Nanoparticle incorporation is a common strategy for promoting the performance of starch-based wood adhesive as low storage stability limits the application of conventional nanocomposite adhesives. This work focuses on the performance comparison of adhesives containing different nanoparticles (nano-TiO2, TK (TiO2-KH570), TKB (TiO2-KH570-Butyl acrylate)) to improve both the bonding strength and storage stability. The structure and morphology of these nanoparticles are characterized by Fourier transform infrared spectroscopy and transmission electron microscopy. The results indicate that the surface modification improves the dispersion of nano-TiO2. After adding in adhesive, the results of shear strength, viscosity, and rheological properties signify that the structural strength within adhesive is related to the surface hydrophobicity and the thickness of the surface hydrophobic layer of functionalized nanoparticles. TKB exhibits excellent improvement on the storage stability of adhesive due to its wide surface hydrophobic layer weakening the intermolecular interaction. TK shows limited improvement on both bonding strength and storage stability as the hanging hydrogen groups from KH570 form cross-linking structure with other components in adhesive. Therefore, selecting the appropriate functional nanoparticles is an important parameter for designing high-performance wood adhesive for the veneer industry.

Automated summary

This study compares the performance of wood adhesives containing different nanoparticles and finds that surface modification can improve dispersion, highlighting the importance of selecting appropriate functional nanoparticles in designing high-performance wood adhesives.