Biobased Protective Nonwovens Integrating Thermal Management, Antifouling, and Absorption-Dominated EMI Shielding via Melt Centrifugal Spinning

Résumé fourni par la source

Abstract The industrialization of customizable biobased thermal management (BTM) fiber is essential for advancing wearable and flexible nonwoven materials; however, it encounters considerable challenges when utilizing conventional processing technologies. Herein, a melt centrifugal spinning technique incorporating cyclone and supergravity processes was developed for the mass production of BTM nonwovens. A large-area micro/nanosized nonwoven with a water vapor transmission rate of 34.2 g m–2 h–1 and a cell viability of 95.6 ± 0.3% was fabricated with the aid of the cyclonic field. The synergistic effects of supergravity and cyclonic actions during spinning effectively reduced the melt-spinning temperature of polylactic acid while enhancing molecular orientation. This improvement strengthened the interaction between polylactic acid/poly-3-hydroxybutyrate-co-4-hydroxybutyrate and poly­(ethylene glycol), allowing the biobased protective fiber to maintain excellent shape stability at 90 °C and achieve a high energy storage capacity of 68.2 J g–1. Interestingly, the superhydrophobic core–shell structure of the micro/nanosized nonwovens markedly improved thermal management performance, delivering a photothermal conversion efficiency of 94.6%, robust electromagnetic shielding with a reduction of 20.7 dB, and antifouling properties across a wide range of scenarios. This work addresses the challenges of scaling up the melt-spinning process for high-viscosity biobased fiber and offers a universal and effective strategy for the industrialization and multifunctional design of biobased nonwovens.

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