Broadband absorption of macro pyramid structure based flame retardant absorbers

Sun, Hengda; Zhang, Ying; Wu, Yue; Zhao, Yue; Zhou, Ming; Liu, Lie; Tang, Shaolong; Ji, Guangbin

doi:10.1016/j.jmst.2022.04.030

Cited by 38 publications

(7 citation statements)

References 49 publications

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“…The limited oxygen index (LOI) is a widely used metric to assess polymeric materials’ flammability and flame retardancy [ 64 ]. Materials exhibiting an LOI above 30% are categorized as flame retardants [ 65 ]. Such materials must also receive a UL 94 V-0 rating to be considered flame retardant [ 66 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Thiol-Functionalized Polysilsesquioxane/Phosphorus Flame-Retardant Blends on the Flammability and Thermal, Mechanical, and Volatile Organic Compound (VOC) Emission Properties of Epoxy Resins

Kim,

Baek,

Chang

et al. 2024

Polymers

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In this study, thiol-functionalized ladder-like polysesquioxanes end-capped with methyl and phenyl groups were synthesized via a simple sol-gel method and characterized through gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), and thermogravimetric analysis (TGA). Additionally, epoxy blends of different formulations were prepared. Their structural, flame-retardant, thermal, and mechanical properties, as well as volatile organic compound (VOC) emissions, were determined using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), TGA, scanning electron microscopy (SEM), limiting oxygen index (LOI), cone calorimetry, and a VOC analyzer. Compared to epoxy blends with flame retardants containing elemental phosphorus alone, those with flame retardants containing elemental phosphorus combined with silicon and sulfur exhibited superior thermal, flame-retardant, and mechanical properties with low VOC emissions. SEM of the residual char revealed a dense and continuous morphology without holes or cracks. In particular, LOI values for the combustion of methyl and phenyl end-capped polysilsesquioxane mixtures were 32.3 and 33.7, respectively, compared to 28.4% of the LOI value for the blends containing only phosphorus compounds. The silicon–sulfur–phosphorus-containing blends displayed reduced flammability concerning the blends using a flame retardant containing only phosphorus. This reflects the cooperative effects of various flame-retardant moieties.

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Section: Resultsmentioning

confidence: 99%

Influence of Thiol-Functionalized Polysilsesquioxane/Phosphorus Flame-Retardant Blends on the Flammability and Thermal, Mechanical, and Volatile Organic Compound (VOC) Emission Properties of Epoxy Resins

Kim,

Baek,

Chang

et al. 2024

Polymers

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“…31 While the main features in the second stage is drastic redox reactions accompanying vigorous heat feedback of combustion. 32 As demonstrated in DTG curves, R max (1.16%/ C) appears in the second decomposition stage of pure TPU, corresponding to the drastic redox reaction and rapid decomposition. In sharp contrast, weight loss rate of TPU/MAPP@FDS exhibits significant slump overall, delivering the R max of 0.58%/ C in the second stage, which is narrowly close to the peaking R value (0.57%/ C) in the first stage.…”

Section: Thermal Stabilitymentioning

confidence: 89%

Comparison of multi‐component and mono‐component intumescent flame retardants for thermoplastic polyurethane composites

Li,

Bi,

Chen

et al. 2024

Vinyl Additive Technology

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Conventional intumescent flame retardant (IFR) is comprised of multiple components (acid, carbon, and gas source). In comparison, “all‐in‐one” design of mono‐component IFR is effective to impart the homogeneity to functional sources in polymer matrix, which is significant to improve the synergy against combustion. In this work, a core‐shell structured mono‐component IFR (MAPP@FDS) are prepared with ammonium polyphosphate (APP) and furfural‐derived Schiff base (FDS) and applied to modification of thermoplastic polyurethane (TPU). TPU composite with the as‐prepared mono‐component IFR (TPU/MAPP@FDS) exhibits V‐0 rating in UL‐94 test and a limiting oxygen index (LOI) value of 32.0%, with prominent bulkiness of carbonaceous layer. Cone calorimetry tests (CCTs) showed a significant reduction in total heat release (THR) and peak heat release rate (pHRR) for TPU/MAPP@FDS compared with the TPU composites with multi‐component IFR. By analyzing the morphology and composition of residual char, the flame‐retardant mechanism of TPU/MAPP@FDS is reasonably proposed. This work illustrates the superiority of the integration to prepare mono‐component IFR and provides a potential method in developing TPU composites with remarkable flame retardancy.Highlights TPU/MAPP@FDS achieves a LOI value of 32.0% and UL‐94 V‐0 rating. TPU/MAPP@FDS exhibits significantly enhanced flame retardancy compared with TPU composites incorporated multi‐component IFR. The synergy in multi‐component IFR is prominently strengthened.

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“…The microwave absorption of samples was investigated by transmission line theory. [83][84][85][86][87] As indicated, the strong maximum RL of ZnS/gypsum plaster is 140.15 dB at 13.20 GHz, gaining efficient bandwidth (RL > 10 dB) as wide as 5.10 GHz with 1.90 mm in thickness. Interestingly, the ZnS/DGCN 75/gypsum plaster attained a marvelous efficient bandwidth of 6.82 GHz (RL > 10 dB) and a maximum RL of 53.13 dB at 14.10 GHz with the same thickness.…”

Section: Microwave-absorbing Performancementioning

confidence: 99%

Fabrication of ZnS/g‐C₃N₄/Gypsum Plaster Nanocomposite Toward Refining Electromagnetic Pollution and Saving Energy

Peymanfar,

Mousivand,

Mirkhan

2023

Energy Tech

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Global concerns have been excited by burgeoning electromagnetic pollution and climate change. Paying attention to building materials is one of the best ways to refine electromagnetic pollution and save energy. Herein, a practical nanocomposite has been introduced that not only absorbs microwaves, but also plays a significant role in energy‐saving. Interestingly, the approach related to the selection of a simple experimental procedure, cost‐effective substrates, and building matrix develops the practical applications of the eventual product. Initially, graphite‐like carbon nitride (g‐C3N4) nanosheets are tailored using a conventional sintering route, and then the prepared nanosheets are ornamented by zinc sulfide (ZnS) nanoparticles through a facile hydrothermal scenario. Remarkably, the microwave and optical features of the tailored ZnS/g‐C3N4 nanocomposite are modulated by regulating the mass fraction of ZnS into 2D structures. Interestingly, a novel defecting agent is used to boost the dielectric characteristics of g‐C3N4 through an innovative complementary hydrothermal and combustion scenario. Eventually, the architected structures are blended with gypsum plaster to evaluate energy‐saving and microwave‐absorbing performance. The nanocomposites fabricated by ZnS/defected g‐C3N4/gypsum plaster as building materials have significant microwave‐absorbing and infrared reflection capacity. The presented research opens a new vista for simultaneous development of advanced functional materials for energy‐saving and microwave absorption.

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Broadband absorption of macro pyramid structure based flame retardant absorbers

Cited by 38 publications

References 49 publications

Influence of Thiol-Functionalized Polysilsesquioxane/Phosphorus Flame-Retardant Blends on the Flammability and Thermal, Mechanical, and Volatile Organic Compound (VOC) Emission Properties of Epoxy Resins

Influence of Thiol-Functionalized Polysilsesquioxane/Phosphorus Flame-Retardant Blends on the Flammability and Thermal, Mechanical, and Volatile Organic Compound (VOC) Emission Properties of Epoxy Resins

Comparison of multi‐component and mono‐component intumescent flame retardants for thermoplastic polyurethane composites

Fabrication of ZnS/g‐C₃N₄/Gypsum Plaster Nanocomposite Toward Refining Electromagnetic Pollution and Saving Energy

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Broadband absorption of macro pyramid structure based flame retardant absorbers

Cited by 38 publications

References 49 publications

Influence of Thiol-Functionalized Polysilsesquioxane/Phosphorus Flame-Retardant Blends on the Flammability and Thermal, Mechanical, and Volatile Organic Compound (VOC) Emission Properties of Epoxy Resins

Influence of Thiol-Functionalized Polysilsesquioxane/Phosphorus Flame-Retardant Blends on the Flammability and Thermal, Mechanical, and Volatile Organic Compound (VOC) Emission Properties of Epoxy Resins

Comparison of multi‐component and mono‐component intumescent flame retardants for thermoplastic polyurethane composites

Fabrication of ZnS/g‐C3N4/Gypsum Plaster Nanocomposite Toward Refining Electromagnetic Pollution and Saving Energy

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Product

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About

Fabrication of ZnS/g‐C₃N₄/Gypsum Plaster Nanocomposite Toward Refining Electromagnetic Pollution and Saving Energy