Abstract:Metal–organic
frameworks (MOFs) exhibit highly
designable properties and have been used in wide applications. To
further improve their performance, the modification of MOFs is an
effective method. However, the modification process is usually complicated.
Besides, the sustainable use of MOFs is difficult to achieve due to
the complicated recycling treatment. Herein, we designed a polyethyleneimine
(PEI)-modified NH
2
-MIL-101(Al) composite (PEI@NH
2
-MIL-101(Al)). T… Show more
“…The temperatures at 5% and 50% mass loss and the maximum mass loss rate temperature are defined as T 5% , T 50% and T max , 12 respectively. The value of T 5% can reflect the thermal stability at the initial heating stage 17 and this value for the pure PS is 343 1C under the N 2 atmosphere. The addition of S-Fe-MOF significantly increases the corresponding value of PS/S-Fe-3.0 to 430 1C.…”
This research proposes a simple and feasible method to prepare hydrophobic structures and it is a fortuitous finding. In our previous publication, triethyl phosphate is adsorbed on porous metal-organic framework...
“…The temperatures at 5% and 50% mass loss and the maximum mass loss rate temperature are defined as T 5% , T 50% and T max , 12 respectively. The value of T 5% can reflect the thermal stability at the initial heating stage 17 and this value for the pure PS is 343 1C under the N 2 atmosphere. The addition of S-Fe-MOF significantly increases the corresponding value of PS/S-Fe-3.0 to 430 1C.…”
This research proposes a simple and feasible method to prepare hydrophobic structures and it is a fortuitous finding. In our previous publication, triethyl phosphate is adsorbed on porous metal-organic framework...
“…On the other hand, due to the presence of -NH 2 , NH 3 is released during the combustion of EP, which dilutes the combustible gas and acts as a flame retardant in the gas phase. Wang et al [ 88 ] modified NH 2 -MIL-101(Al) with polyethyleneimine (PEI) and used adsorbed dye as a further modification step to achieve sustainable application of MOF materials. Meanwhile, the synergistic effect of adsorbed dyes, MOF, and PEI enhanced the flame-retardant properties of EP.…”
Section: Hybrid Of Phosphorus–nitrogen Compounds and Mofs As Flame Re...mentioning
Polymer matrix is vulnerable to fire hazards and needs to add flame retardants to enhance its performance and make its application scenarios more extensive. At this stage, it is more necessary to add multiple flame-retardant elements and build a multi-component synergistic system. Metal organic frameworks (MOFs) have been studied for nearly three decades since their introduction. MOFs are known for their structural advantages but have only been applied to flame-retardant polymers for a relatively short period of time. In this paper, we review the development of MOFs utilized as flame retardants and analyze the flame-retardant mechanisms in the gas phase and condensed phase from the original MOF materials, modified MOF composites, and MOF-derived composites as flame retardants, respectively. The effects of carbon-based materials, phosphorus-based materials, nitrogen-based materials, and biomass on the flame-retardant properties of polymers are discussed in the context of MOFs. The construction of MOF multi-structured flame retardants is also introduced, and a variety of MOF-based flame retardants with different morphologies are shown to broaden the ideas for subsequent research.
“…(3) Experimental characterization means X-ray diffraction (XDR) was mainly adopted to characterize the crystal structure of the samples [9]. Sample pretreatment: the dried sample was ground into the powder with a mortar, and then the tablet was pressed into the mold.…”
Section: Research Progress On Flame Retardancy Of Layered Compositesmentioning
The effects of a magnesium-based layered composite on the flammability of a phenolic epoxy resin (EP) are studied. In order to produce the required composite material, first, magnesium hydroxide, aluminum salt and deionized water are mixed into a reactor according to a certain proportion to induce a hydrothermal reaction; then, the feed liquid is filtered out using a solid-liquid separation procedure; finally, the material is dried and crushed. In order to evaluate its effects on the flammability of the EP, first, m-phenylenediamine is added to EP and vacuum defoamation is performed; then, EP is poured into a polytetrafluoroethylene mold, cooled to room temperature and demoulded; finally, the magnesium-based layered composite is added to EP, and its flame retardance is characterized by thermogravimetric analysis, limiting oxygen index and cone calorimetry. The X-ray diffraction patterns show that the baseline of magnesium-based layered composite is stable and the front shape is sharp and symmetrical when the molar ratio of magnesium to aluminium is 3.2:1; with the addition of magnesium-based layered composite, the initial pyrolysis temperature of EP of 10%, 15% and 30% magnesium-based layered composite decreases to 318.2°C, 317.9°C and 357.1°C, respectively. After the reaction, the amount of residual carbon increases to 0.1%, 3.45% and 8.3%, and the limiting oxygen index increases by 28.3%, 29.1% and 29.6%, respectively. The maximum heat release rate of cone calorimeter decreases gradually. The optimum molar ratio of Mg:Al for green synthesis is 3.2:1, and the NO3-intercalated magnesium-based layered composite has the best flame retardance properties.
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