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Ultra-tough, photothermal healing and fire safety polystyrene/hydroxylated black phosphorus-triazine COF composites.

Authors :
Zou, Bin
Qiu, Shuilai
Qian, Ziyan
Li, Wensheng
Chu, Fukai
Xiao, Yuling
Zhou, Yifan
Niu, Haoxin
Song, Lei
Hu, Yuan
Source :
Composites: Part B, Engineering. Sep2022, Vol. 244, pN.PAG-N.PAG. 1p.
Publication Year :
2022

Abstract

Devoting to coping with safety risk spreading with polymers, this work achieves dramatic synergistic improvements in composite toughness, photothermal healing, and fire safety through a novel targeted modification strategy for black phosphorus (BP). In detail, we herein use the emerging 2D BP as a template for in-situ growth by covalent triazine framework (HBP-CTF). Incorporating gradient increased HBP-CTF (1, 2, 4 wt%) into polystyrene (PS), the elongation at break increased by 61.59%, 74.60% and 62.82% for composites, respectively. This is attributed to the synergistic effects of two components of HBP-CTF as stress conduction unit and interface and dispersion improver, respectively. Furthermore, PS/HBP-CTF composites achieve photothermal healing over 96% in strength and elongation at break induced by outstanding photothermal properties (linearly quantifiable, R2 > 0.997). Noted, PS/HBP-CTF 2.0 and PS/HBP-CTF 4.0 achieve record reductions of 61.77% and 69.85% in peak heat release rate, accompanied by dramatically reduced total heat release. Taking the pyrolysis of HBP-CTF as an index, this work proposes the idea of using P 4 as the key product to monitor and distribute gas phase effects for BP-based flame retardants. The hybridization of CTF to HBP promotes the slow and continuous release of P 4 in the gas phase, revealing the structure and composition of char that cross-linking P and N. This work provides strategies for synergistically overcoming composite brittleness, crack failure, and high flammability, paving the way for practical applications. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
13598368
Volume :
244
Database :
Academic Search Index
Journal :
Composites: Part B, Engineering
Publication Type :
Academic Journal
Accession number :
158745968
Full Text :
https://doi.org/10.1016/j.compositesb.2022.110166