NiTi-layered double hydroxide nanosheets toward high-efficiency flame retardancy and smoke suppression for silicone foam

Zhou, Linlin; Li, Wenxiong; Zhao, Haibo; Wang, Junsheng; Zhao, Bin

doi:10.1016/j.polymdegradstab.2022.110104

Cited by 32 publications

(11 citation statements)

References 68 publications

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“…Thus, the derived value of the FIGRA parameter of the SiF was lowered from 0.87 to 0.53 and 0.55 kW m −2 ·s −1 by the introduction of both CoAl-LDH and NiAl-LDH, respectively, leading to an enhanced fire safety of SiF. More importantly, as in the previous report [ 53 ], the LDHs exhibited a high efficiency in smoke suppression. The TSP values of SiF/CoAl-LDH-1.0 and SiF/NiAl-LDH-1.0 declined by 33% and 45%, respectively, from the value of 9.5 m 2 for the untreated SiF.…”

Section: Resultssupporting

confidence: 54%

“…The foaming chemistry reactions for SiF relied on a dehydrogenative coupling reaction that occurred between PMHS and HO-PDMS for SiF, as well as an addition–cure reaction that occurred between Vi-PDMS and PMHS in the presence of a Pt catalyst for Vi-PDMS [ 53 ]. For the SiF/LDH nanocomposites, in detail, the reactive materials were divided and prepared in two parts.…”

Section: Methodsmentioning

confidence: 99%

“…However, the high loadings and low flame-retardant efficiency limit its application [ 43 , 50 , 51 , 52 ]. In our previous work [ 53 ], the addition of transition-metal-containing NiTi-LDH was able to significantly improve the flame retardancy and smoke suppression of SiF. The incorporation of only 1 phr NiTi-LDH endowed SiF with a high limiting oxygen index (LOI) of 30.3% and a UL-94 V-0 level.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study of M(Ⅱ)Al (M=Co, Ni) Layered Double Hydroxides for Silicone Foam: Characterization, Flame Retardancy, and Smoke Suppression

Zhou

Zhao

et al. 2022

IJMS

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To compare the different actions of the two representative transition metal cations of Co2+ and Ni2+ in layered double hydroxides (LDHs), CoAl-LDH and NiAl-LDH intercalated with CO32− were synthesized, and the chemical structures, microstructures, and surface areas thereof were successfully characterized. Then, the two LDHs were utilized as flame retardants and smoke suppressants for silicone foam (SiF). The densities, flame retardancy, smoke suppression, thermal stabilities, and compressive strengths of the two SiF/LDHs nanocomposites were investigated. The introduction of LDHs slightly decreased the density of SiF due to the catalytic actions of Co and Ni during the foaming process of SiF. With respect to the flame retardancy, the addition of only 1 phr of either CoAl-LDH or NiAl-LDH could effectively improve the limiting oxygen index of SiF from 28.7 to 29.6%. Based on the results of vertical flame testing and a cone calorimeter test, the flame retardancy and fire safety of the SiF were effectively enhanced by the incorporation of LDHs. In addition, owing to the good catalytic action and large specific surface area (NiAl-LDH: 174.57 m2 g−1; CoAl-LDH: 51.47 m2 g−1), NiAl-LDH revealed higher efficiencies of flame retardancy and smoke suppression than those of CoAl-LDH. According to the results of energy-dispersive X-ray spectroscopy, Co and Ni participated in the formation of protective char layers, which inhibited the release of SiO2 into the gas phase. Finally, the influences on the thermal decomposition and compressive strength for SiF resulting from the addition of LDHs are discussed.

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Section: Resultssupporting

confidence: 54%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative Study of M(Ⅱ)Al (M=Co, Ni) Layered Double Hydroxides for Silicone Foam: Characterization, Flame Retardancy, and Smoke Suppression

Zhou

Zhao

et al. 2022

IJMS

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“…In general, flame retardants are added to polymer materials to improve the flame retardancy of polymer materials . The flame retardant systems mainly include mineral flame retardants, − halogen flame retardants, nitrogen flame retardants, − silicone flame retardants, − bio-based flame retardants − and phosphorus flame retardants. − Among them, a mineral flame retardant needs to be added in a large amount to achieve a flame retardant effect, which will have a certain influence on other properties of materials and halogen flame retardants are prohibited in many fields because of their high toxicity. The application of nitrogen flame retardants is limited due to their low thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of High-Molecular-Weight Bifunctional Additives with both Flame Retardant Properties and Antistatic Properties via ATRP

et al. 2022

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Polystyrene (PS) is widely used in our daily life, but it is flammable and produces a large number of toxic gases and hightemperature flue gases in the combustion process, which limit its application. Improving the flame retardancy of PS has become an urgent problem to be solved. In addition, in view of the disadvantage that small-molecule flame retardants can easily migrate from polymers during use, which leads to the gradual reduction of the flame retardant effect or even loss of flame retardant performance, and the outstanding advantages of ATRP technology in polymer structure design and function customization, we used ATRP technology to synthesize the high-molecular-weight bifunctional additive PFAA-DOPO-b-PDEAEMA, which has flame retardant properties and antistatic properties. The chemical structure and molecular weight of PFAA-DOPO-b-PDEAEMA were characterized by FTIR, 1 H NMR, GPC, and XPS. When the addition of PFAA-DOPO-b-PDEAEMA was 15 wt %, the limiting oxygen index (LOI) of polystyrene composites was 28.4%, which was 53.51% higher than that of pure polystyrene, the peak of the heat release rate (pHRR) was 37.61% lower than that of pure polystyrene, UL-94 reached V-0 grade, and the flame retardant index (FRI) was 2.98. In addition, when the PFAA-DOPO-b-PDEEMA content is 15 wt %, the surface resistivity and volume resistivity of polystyrene composites are 2 orders of magnitude lower than those of polystyrene. This research work provides a reference for the design of bifunctional and even multifunctional polymers.

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“…Layered double hydroxides (LDH) have shown good flame retardancy and smoke suppression with nontoxic and halogen-free properties due to their unique chemical composition and layered structure [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. For the special layered structure with exchangeable anion between layers, some researchers have attempted to intercalate flame-retardant elements to enhance its efficiency [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Flammability, Crystal Behaviors and Mechanical Performance of Polyamide 11 Composites by Intercalated Layered Double Hydroxides

Peng

Yang

Tang

2022

IJMS

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Sulfamic acid-intercalated MgAl-LDH (SA-LDH) was prepared by an anion exchange method, and its structure was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). SA-LDH was introduced into polyamide 11 (PA11) by melt blending and to enhance the flame retardancy and mechanical properties. The scanning electron microscope (SEM) and XRD data showed that the lamellar structure of SA-LDH was partly disrupted. The cone calorimeter (CCT) results demonstrated that SA-LDH could effectively decrease the value of heat release rate, which may be ascribed to the better distribution of SA-LDH compared to LHD in the PA11 matrix. The effects of SA-LDH on the crystal behaviors of PA11 were investigated by XRD and differential scanning calorimetry (DSC), indicating that SA-LDH could induce the formation of new crystal forms and served as a heterogeneous nucleating agent. The mechanical progress caused by the incorporation of SA-LDH was correlated with compatibility improvement between SA-LDH and PA11.

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NiTi-layered double hydroxide nanosheets toward high-efficiency flame retardancy and smoke suppression for silicone foam

Cited by 32 publications

References 68 publications

Comparative Study of M(Ⅱ)Al (M=Co, Ni) Layered Double Hydroxides for Silicone Foam: Characterization, Flame Retardancy, and Smoke Suppression

Comparative Study of M(Ⅱ)Al (M=Co, Ni) Layered Double Hydroxides for Silicone Foam: Characterization, Flame Retardancy, and Smoke Suppression

Synthesis of High-Molecular-Weight Bifunctional Additives with both Flame Retardant Properties and Antistatic Properties via ATRP

Study on the Flammability, Crystal Behaviors and Mechanical Performance of Polyamide 11 Composites by Intercalated Layered Double Hydroxides

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