Optimizing Adhesion and Thermal Properties of PBAT-Based Hot-Melt Adhesives via Tailored Side-Chain Architectures

Abstract

This study explores the optimization of adhesion and thermal properties of poly(butylene adipate-co-terephthalate) (PBAT)-based hot-melt adhesives through tailored side-chain architectures. PBAT copolymers were synthesized via melt polycondensation with 2-methyl-1,3-propanediol (MPO) and neopentyl glycol (NPG) as comonomers to enhance adhesion performance for polyester fabric lamination. Structural characterization by H-1-NMR and FT-IR confirmed successful incorporation, while DSC revealed a reduction in melting temperature (Tm) from 134.3 degrees C to 95.4 degrees C and a decrease in crystallization temperature (Tc) with increasing MPO/NPG content. TGA demonstrated high thermal stability, with Td-5% ranging from 350.5 degrees C to 362.5 degrees C. Mechanical testing showed enhanced flexibility, decreasing Shore D hardness from 24.7 to 17.3 at 30 mol% modification. Rheological analysis indicated improved melt flow and shear-thinning behavior, facilitating processing. T-peel strength tests significantly increased, reaching 101.20 N/25 mm for PBAT-N20 at Tm + 15 degrees C, compared to 35.64 N/25 mm for neat PBAT. Water contact angle measurements confirmed increased hydrophobicity, rising from 62.89 degrees to 74.80 degrees, contributing to improved hydrolysis resistance. These findings highlight the effectiveness of side-chain engineering in fine-tuning PBAT-based adhesives, achieving an optimal balance of adhesion strength, flexibility, and durability for high-performance textile applications.