Interface-engineered Polybenzoxazine/Aramid Ⅲ nanofiber composite aerogels with ultralow thermal conductivity, exceptional mechanical robustness, and intrinsic flame retardancy

Jiandong Yin

doi:10.1016/j.jmst.2025.12.038

Interface-engineered Polybenzoxazine/Aramid Ⅲ nanofiber composite aerogels with ultralow thermal conductivity, exceptional mechanical robustness, and intrinsic flame retardancy

2025-12-26

0

PRE

AI

J

Jiandong Yin

B

Bin Wang *

Y

Yunmei Xie

G

Guiyan Yang

D

Dong Xiang

Y

Yuanpeng Wu

T

Tao Peng

J

Jie Zhang

T

Tianhang Huang

C

Chunxia Zhao

H

Hui Li

J

Jinbo Cheng

X

Xinnian Fan

DOI：10.1016/j.jmst.2025.12.038

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Abstract

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• Interface-engineered design: In-situ polybenzoxazine coating on aramid III nanofibers forms robust interfacial bonding and hierarchical flame-retardant barriers. • Multifunctional performance: Achieves ultralight density (0.315 g·cm⁻³) with high compressive strength (18.92 MPa) and low radial thermal conductivity (0.032 W·m⁻¹·K⁻¹). • Superior fire safety: Exhibits LOI of 41.7 %, 88% reduction in char length, 78 % lower peak heat-release rate, and 60.7 % residual-char yield. • Long-term durability: Maintains superhydrophobicity (151° contact angle) via silicon-nanowire coating under varied humidity. • Mechanistic insight: Hydrogen bonding, π–π stacking, and P=O/P–O bonds synergistically enhance interfacial adhesion and char-layer integrity.

Interface-engineered Polybenzoxazine/Aramid Ⅲ nanofiber composite aerogels with ultralow thermal conductivity, exceptional mechanical robustness, and intrinsic flame retardancy

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