scholarly journals Thermal Analysis and Flame-Retarded Mechanism of Composites Composed of Ethylene Vinyl Acetate and Layered Double Hydroxides Containing Transition Metals (Mn, Co, Cu, Zn)

2016 ◽  
Vol 6 (5) ◽  
pp. 131 ◽  
Author(s):  
Lili Wang ◽  
Milin Zhang ◽  
Bin Li
Keyword(s):  
Thermal Analysis ◽  
Transition Metals ◽  
Vinyl Acetate ◽  
Layered Double Hydroxides ◽  
Ethylene Vinyl Acetate ◽  
Flame Retarded ◽  
Double Hydroxides

scholarly journals Improving the flame retardancy of ethylene vinyl acetate composites by incorporating layered double hydroxides based on Bayer red mud

e-Polymers ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 129-140 ◽  
Author(s):  
Yi Qian ◽  
Kangjia Jiang ◽  
Long Li
Keyword(s):  
Vinyl Acetate ◽  
Flame Retardancy ◽  
Layered Double Hydroxides ◽  
Red Mud ◽  
Ethylene Vinyl Acetate ◽  
Precipitation Method ◽  
Infrared Spectrometry ◽  
Cone Calorimeter Test ◽  
Bayer Red Mud ◽  
Double Hydroxides

AbstractNowadays, reducing the hazards of bayer red mud (BRM) is an important research direction in the fields of environmental and safety. In this article, Mg/Al/Fe ternary layered double hydroxides (Mg/Al/Fe-LDHs) were synthesized successfully by a co-precipitation method based on introducing Mg2+ into the BRM suspension. The thermogravimetric analysis (TGA) results showed that the decomposition rate of LDHs is higher than that of BRM, which indicates that LDHs can absorb more heat than BRM during the decomposition process. Subsequently, BRM and LDHs were added into the ethylene vinyl acetate (EVA) to investigate its effects on reducing flammability of the composites. The cone calorimeter test (CCT) results demonstrated that 50 wt% LDH-B can make the peak value of HRR (PHRR) decrease from 1694.8 kW/m2 (EVA) to 199.2 kW/m2 (ELDH2). The smoke density test (SDT) results showed that the luminous flux of ELDH2 is nearly 95% at the end of test with a pilot flame, which is much higher than that of EVA and EBRM. The thermogravimetry-Fourier transform infrared spectrometry (TG-FTIR) results confirmed that LDHs can improve the thermal stability of composites and reduce the production of some toxic gases. Compared with BRM, the improved flame retardancy of Mg/Al/Fe-LDHs is ascribed to the introduction of Mg2+, which offering an enhanced catalytic carbonization capability, as well as the physical barrier effect of char residue layer catalyzed by the lamellar LDHs

scholarly journals Synthesis and characterization of two-component acidic ion intercalated layered double hydroxide and its use as a nanoflame-retardant in ethylene vinyl acetate copolymer (EVA)

RSC Advances ◽  
2017 ◽  
Vol 7 (84) ◽  
pp. 53064-53075 ◽  
Author(s):  
Xiuhua Zhou ◽  
Hong Chen ◽  
Qinghua Chen ◽  
Qidan Ling
Keyword(s):  
Vinyl Acetate ◽  
Layered Double Hydroxides ◽  
Ethylene Vinyl Acetate ◽  
Synthesis And Characterization ◽  
Two Component ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

A series of two-component acidic ion intercalated layered double hydroxides (MgAlZn-X1/X2-LDHs) were synthesized by coprecipitation under microwave crystallization, and were further used as novel nanoflame-retardants for ethylene vinyl acetate (EVA).

Synergistic flame retardant effect between nano-silicon dioxide and layered double hydroxides in ethylene vinyl acetate composites

2017 ◽  
Vol 31 (10) ◽  
pp. 1295-1309 ◽  
Author(s):  
Yi Qian ◽  
Shaojie Zhou ◽  
Xilei Chen
Keyword(s):  
Silicon Dioxide ◽  
Heat Release ◽  
Flame Retardant ◽  
Vinyl Acetate ◽  
Layered Double Hydroxides ◽  
Ethylene Vinyl Acetate ◽  
Limiting Oxygen Index ◽  
Nano Silicon ◽  
Synergistic Flame Retardant ◽  
Double Hydroxides

Layered double hydroxides (LDHs) were synthesized by a coprecipitation method. The synergistic flame retardant effect of nano-silicon dioxide (nano-SiO2) on ethylene vinyl acetate (EVA)/LDHs composites was studied using limiting oxygen index (LOI), cone calorimeter test (CCT), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Results showed that the LOI values of the EVA/LDHs/nano-SiO2 composites were basically higher than that of the EVA/LDHs composite, and the EVA composite with 48% LDHs and 2% nano-SiO2 reached an LOI value of up to 31.2%. The CCT results indicate that the addition of nano-SiO2 greatly reduced the heat release rate, total heat release, mass loss, smoke production rate, total smoke release, and smoke factor. The morphology and structures of residues investigated by SEM gave positive evidence that char layers formed from the EVA/LDHs/nano-SiO2 composites were improved. The TGA data showed that the EVA/LDHs/nano-SiO2 composites show a higher thermal stability than the EVA/LDHs composites.

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