Nanohybrid silver nanoparticles@halloysite nanotubes coated with polyphosphazene for effectively enhancing the fire safety of epoxy resin

Hong, Jing; Wu, Tong; Wu, Haiyang; Zeng, Birong; Zeng, Shanni; Chen, Ting; Xiu, Wang; Lu, Zhenwu; Yuan, Conghui; Krishnasamy, Balaji; Petri, Denise Freitas Siqueira; Dai, Lizong

doi:10.1016/j.cej.2020.127087

Cited by 119 publications

(34 citation statements)

References 66 publications

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“…Because of their characteristics of organic–inorganic hybrid, polyphosphazene with different functions can be synthesized by molecular design to meet different application requirements. It has been widely used in the fields of flame retardants, elastomers, drug delivery, , membranes, supercapacitors, , etc. However, there are few reports about polyphosphazene-based recyclable nanocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Magnetically Recoverable MPCTP-Ag Composite Nanoparticles and Their Application as High-Performance Catalysts

et al. 2021

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In the present research, magnetically recyclable polyphosphazene (PCTP)/Ag (MPCTP-Ag) nanoparticles are prepared by a green path, in which PCTP was used to modify Fe3O4 nanoparticles and provide nucleation sites for the reduction of Ag nanoparticles. The prepared MPCTP-Ag nanoparticles were characterized by TEM, SEM, EDS, BET, XRD, vibrating sample magnometry, XPS, and TGA analysis. The catalytic performances of the MPCTP-Ag nanoparticles for the degradation of 4-nitrophenol (4-NP), methylene blue (MB), methyl orange (MO), and their mixtures in the presence of NaBH4 were studied. The main factors affecting the catalytic performance, including temperature, reactant concentration, and catalyst dosage, were investigated. The results showed that the MPCTP-Ag nanoparticles exhibited excellent catalytic activity for the degradation of all three targeted organic contaminants (4-NP, MB, and MO). Moreover, the product retains its catalytic activity after being reused five times by magnetic separation. The results showed that MPCTP-Ag composite nanoparticles were efficient recyclable magnetic nanocatalysts with promising application in environment protection.

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Section: Introductionmentioning

confidence: 99%

Preparation of Magnetically Recoverable MPCTP-Ag Composite Nanoparticles and Their Application as High-Performance Catalysts

et al. 2021

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“…Nevertheless, the rapidly formed char was too brittle to prevent the progressive effusion of escaping volatiles, and thus a summit was followed by a row of successive adjacent peaks, further evidencing the poor quality of char strength. The fragile char played the reverse role in reducing the THR value for EP/LDH@PZS@NH, which was even higher than that of the untreated EP (95.0 and 88.1 MJ/m 2 , respectively) . In contrast, EP incorporated by ZIF@LDH@PZS lowered the THR value to 76.7 MJ/m 2 .…”

Section: Resultsmentioning

confidence: 86%

“…The fragile char played the reverse role in reducing the THR value for EP/LDH@PZS@NH, which was even higher than that of the untreated EP (95.0 and 88.1 MJ/ m 2 , respectively). 34 In contrast, EP incorporated by ZIF@ LDH@PZS lowered the THR value to 76.7 MJ/m 2 . Apart from the HRR, smoke and toxic gas release are also crucial to detemine the safety of the polymer nanocomposites under combustion.…”

Section: Resultsmentioning

confidence: 95%

Precise Control of a Yolk-Double Shell Metal–Organic Framework-Based Nanostructure Provides Enhanced Fire Safety for Epoxy Nanocomposites

Hou

Song

Rehman

et al. 2022

ACS Appl. Mater. Interfaces

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Nanomaterials derived from metal–organic frameworks (MOFs) are highly promising as future flame retardants for polymeric materials. The precise control of the interface for polymer nanocomposites is taking scientific research by storm, whereas such investigations for MOF-based nanofillers are rare. Herein, a novel yolk-double shell nanostructure (ZIF-67@layered double hydroxides@polyphophazenes, ZIF@LDH@PZS) was subtly designed and introduced into epoxy resin (EP) as a flame retardant to fill the vacancy of yolk/shell construction in the field. Meanwhile, the interface of the polymer nanocomposites can be further accurately tailored by the outermost layer of the nanofillers from PZS to Ni(OH)2 (NH), by which hollow nanocages with treble shells (LDH@PZS@NH) were obtained. It is remarkably interesting that LDH@PZS@NH endows the EP with the lowest peak of heat release rate in the cone calorimeter test, but the total heat and smoke releases (THR and TSP) of the nanocomposites are even higher than those of the neat polymer. In contrast, EP blended with ZIF@LDH@PZS shows outstanding comprehensive performance: with 2 wt.%, the limiting oxygen index is increased to 29.5%, and the peak heat release rate is reduced by 26.0%. The impact and flexural strengths are slightly lowered, while the storage modulus is enhanced remarkably compared with that for neat EP. The flame retardant mechanism is systematically explored focusing on the interfacial interactions of different hybrids within the epoxy matrix, ushering in a new stage of study of nanostructural design-guided interface manipulation in MOF-based polymer nanocomposites.

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“…The smoke release is one key factor in the cause of human death in a fire [62]. The addition of BP-NH 2 reduced the smoke release of the EP matrix as well.…”

Section: Flame Retardancy Of Ep Compositesmentioning

confidence: 99%

Surface Functionalization of Black Phosphorus via Amine Compounds and Its Impacts on the Flame Retardancy and Thermal Decomposition Behaviors of Epoxy Resin

et al. 2021

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Recently, lots of effort has been placed into stabilizing black phosphorus (BP) in the air to improve its compatibility with polymers. Herein, BP was chemically functionalized by aliphatic amine (DETA), aromatic amine (PPDA) and cyclamine (Pid) via a nucleophilic substitution reaction, aiming to develop an intensively reactive BP flame retardant for epoxy resin (EP). The -NH2 group on BP-DETA, BP-PPDA and BP-Pid reacted with the epoxide group at different temperatures. The lowest temperature was about 150 °C for BP-DETA. The impacts of three BP-NH2 were compared on the flame retardancy and thermal decomposition of EP. At 5 wt% loading, EP/BP-NH2 all passed UL 94 V 0 rating. The limiting oxygen index (LOI) of EP/BP-PPDA was as high as 32.3%. The heat release rate (HRR) of EP/BP-DETA greatly decreased by 46% and char residue increased by 73.8%, whereas HRR of EP/BP-Pid decreased by 11.5% and char residue increased by 50.8%, compared with EP. Average effective heat of combustion (av-EHC) of EP/BP-Pid was lower than that of EP/BP-DETA and EP/BP-PPDA. In view of the flame-retardant mechanism, BP nanosheets functionalized with aliphatic amine and aromatic amine played a dominant role in the condensed phase, while BP functionalized with cyclamine was more effective in the gas phase.

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Nanohybrid silver nanoparticles@halloysite nanotubes coated with polyphosphazene for effectively enhancing the fire safety of epoxy resin

Cited by 119 publications

References 66 publications

Preparation of Magnetically Recoverable MPCTP-Ag Composite Nanoparticles and Their Application as High-Performance Catalysts

Preparation of Magnetically Recoverable MPCTP-Ag Composite Nanoparticles and Their Application as High-Performance Catalysts

Precise Control of a Yolk-Double Shell Metal–Organic Framework-Based Nanostructure Provides Enhanced Fire Safety for Epoxy Nanocomposites

Surface Functionalization of Black Phosphorus via Amine Compounds and Its Impacts on the Flame Retardancy and Thermal Decomposition Behaviors of Epoxy Resin

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