Effect of FDCA content on the properties of bio-based polyester polyols and reactive polyurethane hot-melt adhesives

Bio-based FDCA was incorporated into PBS to improve adhesive performance. • Copolyester polyols and reactive PURHMAs were synthesized by tuning monomer ratios. • 30% FDCA delivers 8.20 MPa lap shear strength with high thermal stability. To address the shortcomings of mechanical properties in conventional bio-based adhesives, this study innovatively incorporates bio-based 2,5-furandicarboxylic acid (FDCA), which features a rigid ring structure, into the poly(butylene sebacate) system. By adjusting the monomer ratios, a series of copolyester polyols and reactive polyurethane hot-melt adhesives (PURHMAs) were synthesized. Systematic characterization results indicate that the incorporation of FDCA significantly enhances the mechanical performance of the materials. Specifically, when FDCA accounts for 30% of the total acid component in molar terms, the lap shear strength of PURHMAs on PC substrates reaches 8.20 MPa, representing a notable improvement compared to the unmodified system, while excellent thermal stability is maintained. This research confirms the significant potential of copolymerization modification strategies in developing high-strength, heat-resistant bio-based adhesives.