Synergistic effects of aryl diazonium modified Few-Layer black Phosphorus/Ultrafine rare earth yttrium oxide with enhancing flame retardancy and catalytic smoke toxicity suppression of epoxy resin

Wang, Jingwen; Qiu, Shuilai; Cheng, Liang; Chen, Weijian; Zhou, Yifan; Zou, Bin; Han, Longfei; Xu, Zhoumei; Yang, Wenhao; Hu, Yuan; Song, Lei

doi:10.1016/j.apsusc.2021.151356

Cited by 37 publications

(9 citation statements)

References 65 publications

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“…Raman spectroscopy was used to analyze the graphitization degree of the residual char to further investigate the flame retardancy mechanism of PP/LDH-LS@CS@PAMn composites. As illustrated in Figure 10, the peaks at 1365 and 1596 cm −1 corresponded to the D and G peaks of the graphitized layer of the char residue, respectively, 74 and their peak area ratio (I D /I G ) represented the graphitization degree of the char residue. 75 The absence of a peak representing the graphitization degree of the PP/LDH residual char after combustion suggested the inability of LDH to char layer formation with thermal insulation during thermal decomposition.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Fabrication of Green and Scalable N/P/S/Mn Containing Biobased Layered Double Hydroxide as a Novel Flame Retardant and Efficient Char Forming Agent for Polypropylene

Yan

Ding

Min

et al. 2023

ACS Sustainable Chem. Eng.

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To date, designing efficient bio-based flame retardants for polypropylene (PP) and exploring a green and scalable strategy have remained a hot topic of research. Here, we present a green and convenient preparation of a bio-based flame retardant (LDH-LS@CS@PAMn) for layer-by-layer assembly by utilizing water as an assembly medium. By electrostatic interactions, LDH-LS@CS@PAMn was prepared by the sequential assembly of sodium lignosulfonate-modified layered double hydroxide (LDH-LS) with positively charged chitosan (CS) followed by negatively charged sodium phytate (PAMn). With increasing LDH-LS@CS@PAMn loading in PP composites, the corresponding total heat release rate (THR) and peak heat release rate (PHRR) values were reduced remarkably. With loading 20 wt % LDH-LS@CS@PAMn, the THR and PHRR of PP/LDH-LS@ CS@PAMn decreased by 37.6 and 59.1%, respectively, while the limiting oxygen index significantly improved to 31.6% and the V-0 rating was successfully passed by the UL-94. Especially for PP/LDH-LS@CS@PAMn composites, the total smoke production (TSP) was reduced by 47.4%. More importantly, the residual PP/LDH-LS@CS@PAMn char changed from gray to brown-black compared to PP/LDH, indicating a stronger residual char formation. The outstanding fire safety, smoke suppression, and char formation capabilities of PP composites were ascribed to the synergistic LDH-LS@CS@PAMn hybrid's action. This work provided a feasible and reasonable modification idea to improve smoke suppression and flame retardancy for LDH.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Fabrication of Green and Scalable N/P/S/Mn Containing Biobased Layered Double Hydroxide as a Novel Flame Retardant and Efficient Char Forming Agent for Polypropylene

Yan

Ding

Min

et al. 2023

ACS Sustainable Chem. Eng.

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“…The weak VdW interaction between the protective layers and the BP surface, according to DFT simulations, does not affect the desirable features of phosphorene. ,, Covalent BP modification, on the other hand, is efficient in controlling the electrical and chemical characteristics of nanoparticles by forming new chemical bonds. The creation of phosphorus carbon bonds on BP, for example, by aryl diazonium functionalization, influences the electrical properties of exfoliated BP. − It demonstrates that modest degrees of functionalization improve semiconductor stability and properties, the BP transistor with better on/off ratio and hole mobility, whereas excessive levels of functionalization lead to the decreasing of BP performance. Another example of chemical passivation is Te doping, which improves BP device performance and increases carrier mobility to 1850 cm 2 V –1 s –1 .…”

Section: Stability and Passivation Of Bpmentioning

confidence: 99%

Trends in the Preparation and Passivation Techniques of Black Phosphorus Nanostructures for Optoelectronics Applications: A Review

Liang

et al. 2023

ACS Appl. Nano Mater.

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Black phosphorus (BP), a two-dimensional (2D) van der Waals (vdW)-layered nanomaterial, has attracted explosive study due to the rediscovery of its 2D counterparts (phosphorene) in 2014. Because of its unique structures, superior electrical and optoelectronic capabilities, and compatibility with silicon-based technologies, it is considered a viable material for high-performance photodetection. Controlled ways for the scalable synthesis of good quality large-sized BP are sought to achieve these wonderful expectations, but perfect methodologies are currently lacking. Meanwhile, cutting-edge research shows that the instability of BP under ambient conditions poses a substantial difficulty in a variety of applications. Here, not only an extensive overview of preparation methods but also a summary of the passivation strategy, photoelectric application, and challenges of BP are provided.

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“…These alkanes and aromatic hydrocarbon products are produced by the degradation of PP and SEBS. In particular, for TPE-S/BP-7.98 (Figure 9b), different gas products are detected: aromatic amines 58 (3082 cm −1 ), hydrocarbons 59 (2930 and 1449 cm −1 ), CO 2 /CO (2362 and 2284 cm −1 ), carbonyl compounds (1790 cm −1 ), arenes (1600 cm −1 ), PO 60 (1267 cm −1 ), and NH 3 (967 cm −1 ). The results show that the flame-retardant system based on BPs can capture free radicals and release nonflammable gases in the gas phase.…”

Section: Morphology Of the Residual Charmentioning

confidence: 99%

High-Performance TPE-S Modified by a Flame-Retardant System Based on Black Phosphorus Nanosheets

Wu²,

Wei

et al. 2022

ACS Omega

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Few-layer black phosphorus nanosheets (BPs) combined with melamine cyanurate and poly(phenylene oxide) were used to prepare a flame-retardant thermoplastic elastomer based on polystyrene (TPE-S) for the first time. Compared with neat TPE-S, BP-modified TPE-S with a phosphorus content of 7.98% (TPE-S/BP-7.98) passed the UL-94 vertical burning V-0 rating, and the limiting oxygen index value increased to 24.0%. The peak heat release rate (PHRR), total heat release, and the average combustion effective heat of TPE-S/BP-7.98 were decreased by 61.8, 26.0, and 35.3%, respectively. The time to PHRR was increased from 90 s (neat TPE-S) to 170 s. Scanning electron microscopy of frozen fracture sections showed favorable compatibility and dispersibility of BPs in TPE-S. In addition, the introduction of BPs showed the most negligible effect on the mechanical properties of TPE-S compared with other flame retardants (aluminum hypophosphite and red phosphorus).

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Synergistic effects of aryl diazonium modified Few-Layer black Phosphorus/Ultrafine rare earth yttrium oxide with enhancing flame retardancy and catalytic smoke toxicity suppression of epoxy resin

Cited by 37 publications

References 65 publications

Fabrication of Green and Scalable N/P/S/Mn Containing Biobased Layered Double Hydroxide as a Novel Flame Retardant and Efficient Char Forming Agent for Polypropylene

Fabrication of Green and Scalable N/P/S/Mn Containing Biobased Layered Double Hydroxide as a Novel Flame Retardant and Efficient Char Forming Agent for Polypropylene

Trends in the Preparation and Passivation Techniques of Black Phosphorus Nanostructures for Optoelectronics Applications: A Review

High-Performance TPE-S Modified by a Flame-Retardant System Based on Black Phosphorus Nanosheets

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