Photothermal-healing, and record thermal stability and fire safety black phosphorus–boron hybrid nanocomposites: mechanism of phosphorus fixation effects and charring inspired by cell walls. Issue 27 (24th June 2022)

• Record Type: Journal Article
• Authors: Zou, Bin; Qiu, Shuilai; Zhou, Yifan; Qian, Ziyan; Xu, Zhoumei; Wang, Jingwen; Xiao, Yuling; Liao, Can; Yang, Wenhao; Han, Longfei; Chu, Fukai; Song, Lei; Gui, Zhou; Hu, Yuan
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 27(2022)
• Page Start: 14423
• Page End: 14434
• Publication Date: 2022-06-24
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta02430f
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Inspired by the structure and good thermal resistance of cell walls in plants, we herein develop a life-cycle safe multifunctional nanocomposite of PC/BP–B, achieving record fire safety and thermal stability via phosphorus fixation effects. Abstract : Inspired by the structure and good thermal resistance of cell walls in plants, we herein develop a life-cycle safe multifunctional nanocomposite of a polycarbonate/black phosphorus–boron nanohybrid (PC/BP–B) with properties of photothermal-healing, thermal stability and fire safety. In the first place, the photothermal conversion capability of PC/BP–B1.0, evidently increases with the irradiation power ( r 2 > 0.994), which indicates a 99.28% recovery of tensile strength. Secondly, by studying the chemical responses of BP to heat, we find that PC/BP–B exhibits self-assembly behavior driven by fire where BPO4 serves as a node inspired by the cell wall. This unique structure can not only bridge carbonate groups and fix phosphorus compounds, but also capture pyrolysis products and catalyze charring. It helps PC/BP–B1.0 achieve better thermal stability and fire safety with a 57.16 °C increase in T −1% and a 70.50% decrease in the heat release rate. Furthermore, the pyrolysis products of polycarbonate-based polymers and black phosphorus-based hybrids (CO2 and P4, P3, and P2 ) in the gas phase are also analyzed in this research. Finally, PC/BP–B1.0 can fully keep phosphorus in the condensed phase, which provides a nature-inspired strategy for reducing the release of phosphorus compounds during pyrolysis that may be detrimental to human health and the ecological environment. This work paves a general path for the design and application of nanocomposites with superior properties of crack healing, thermal stability and fire safety.