Boron‐doped lignin‐based composites transforming textile waste into high‐performance sustainable insulation materials

This study presents the development of boron‐doped lignin‐based composites reinforced with textile waste as a sustainable alternative to conventional insulation materials. By utilizing lignin, a byproduct of the paper industry, and textile waste from cotton and polyester blends, composites with varying boron concentrations (0 %, 5 %, and 10 %) were fabricated, evaluated for their thermal, acoustic, and fire‐resistant properties. Among the samples, alb10 (10 % boron addition to pink cotton/polyester waste) exhibited exceptional performance, achieving a burning speed of 20 mm·s −1 , a significant reduction compared to 160 mm·s −1 in the non‐doped alb0 and a thermal conductivity of 0.04 W·mK −1 , comparable to commercial insulation materials. Compared to the reference material yltm (commercial felt), alb10 demonstrated superior fire resistance, enhanced thermal regulation, and improved acoustic insulation, underscoring boron's critical role as a flame‐retardant additive. This work highlights the potential of boron‐doped lignin‐textile composites to address energy efficiency, fire safety, and waste management challenges, aligning with circular economy principles and offering a cost‐effective, eco‐friendly solution for future insulation applications.