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Flame retardancy of organic-anion-intercalated layered double hydroxides in ethylene vinyl acetate copolymer
https://orcid.org/0000-0002-7892-2019
Abstract To gain high efficiency flame retardant, the twin organic anions intercalated layered double hydroxides (PDxCAy-LDH) were designed and prepared via calcination-reconstruction, where the organic anions were pentaerythritol diphosphate (PD) and cyanuric acid (CA). The morphology, chemical composition and structure of the PDxCAy-LDH materials were characterized, revealed that the PDxCAy-LDH materials were successfully intercalated by the PD and CA anions in single or combining form. The incorporation of the PDxCAy-LDH with ethylene vinyl acetate copolymer (EVA) not only could significantly improve the thermal stability of EVA matrix but also promote the formation of char layer during combustion, owing to the combined advantages of CA, PD and LDH. It was found that the flame retardancy of the PDxCAy-LDH depended on the mass ratio of PD to CA anions, where the PD7CA3-LDH with a 7:3 mass ratio of PD/CA had the best flame retardancy due to the presence of an excellent char layer. The EVA/PD7CA3-LDH composite achieved a LOI value of 28.0% and a UL 94 V-0 rating compared with the EVA/LDH composite with 19.5% and a HB rating, and the peak heat release rate (PHRR) and total heat release (THR) decreased to 340.2 kW∙m−2 and 132.7 MJ∙m−2, respectively. These improvements could be attributed to the catalyzing carbonization of the PD and CA to EVA matrix to form more protective char layers.
Graphical abstract Display Omitted
Highlights Organic anion-intercalated layered double hydroxides (PDxCAy-LDH) were successfully prepared. Both organic anions (PD and CA) were inserted into the interlayers of the LDH in respective and/or combining modes. The effectively-combined effect of PD, CA and LDH could improve the flame retardancy of EVA composites.
Flame retardancy of organic-anion-intercalated layered double hydroxides in ethylene vinyl acetate copolymer
https://orcid.org/0000-0002-7892-2019
Abstract To gain high efficiency flame retardant, the twin organic anions intercalated layered double hydroxides (PDxCAy-LDH) were designed and prepared via calcination-reconstruction, where the organic anions were pentaerythritol diphosphate (PD) and cyanuric acid (CA). The morphology, chemical composition and structure of the PDxCAy-LDH materials were characterized, revealed that the PDxCAy-LDH materials were successfully intercalated by the PD and CA anions in single or combining form. The incorporation of the PDxCAy-LDH with ethylene vinyl acetate copolymer (EVA) not only could significantly improve the thermal stability of EVA matrix but also promote the formation of char layer during combustion, owing to the combined advantages of CA, PD and LDH. It was found that the flame retardancy of the PDxCAy-LDH depended on the mass ratio of PD to CA anions, where the PD7CA3-LDH with a 7:3 mass ratio of PD/CA had the best flame retardancy due to the presence of an excellent char layer. The EVA/PD7CA3-LDH composite achieved a LOI value of 28.0% and a UL 94 V-0 rating compared with the EVA/LDH composite with 19.5% and a HB rating, and the peak heat release rate (PHRR) and total heat release (THR) decreased to 340.2 kW∙m−2 and 132.7 MJ∙m−2, respectively. These improvements could be attributed to the catalyzing carbonization of the PD and CA to EVA matrix to form more protective char layers.
Graphical abstract Display Omitted
Highlights Organic anion-intercalated layered double hydroxides (PDxCAy-LDH) were successfully prepared. Both organic anions (PD and CA) were inserted into the interlayers of the LDH in respective and/or combining modes. The effectively-combined effect of PD, CA and LDH could improve the flame retardancy of EVA composites.
Flame retardancy of organic-anion-intercalated layered double hydroxides in ethylene vinyl acetate copolymer
https://orcid.org/0000-0002-7892-2019
Abstract To gain high efficiency flame retardant, the twin organic anions intercalated layered double hydroxides (PDxCAy-LDH) were designed and prepared via calcination-reconstruction, where the organic anions were pentaerythritol diphosphate (PD) and cyanuric acid (CA). The morphology, chemical composition and structure of the PDxCAy-LDH materials were characterized, revealed that the PDxCAy-LDH materials were successfully intercalated by the PD and CA anions in single or combining form. The incorporation of the PDxCAy-LDH with ethylene vinyl acetate copolymer (EVA) not only could significantly improve the thermal stability of EVA matrix but also promote the formation of char layer during combustion, owing to the combined advantages of CA, PD and LDH. It was found that the flame retardancy of the PDxCAy-LDH depended on the mass ratio of PD to CA anions, where the PD7CA3-LDH with a 7:3 mass ratio of PD/CA had the best flame retardancy due to the presence of an excellent char layer. The EVA/PD7CA3-LDH composite achieved a LOI value of 28.0% and a UL 94 V-0 rating compared with the EVA/LDH composite with 19.5% and a HB rating, and the peak heat release rate (PHRR) and total heat release (THR) decreased to 340.2 kW∙m−2 and 132.7 MJ∙m−2, respectively. These improvements could be attributed to the catalyzing carbonization of the PD and CA to EVA matrix to form more protective char layers.
Graphical abstract Display Omitted
Highlights Organic anion-intercalated layered double hydroxides (PDxCAy-LDH) were successfully prepared. Both organic anions (PD and CA) were inserted into the interlayers of the LDH in respective and/or combining modes. The effectively-combined effect of PD, CA and LDH could improve the flame retardancy of EVA composites.
Flame retardancy of organic-anion-intercalated layered double hydroxides in ethylene vinyl acetate copolymer
Du, Jin-Ze (Autor:in) / Jin, Li (Autor:in) / Zeng, Hong-Yan (Autor:in) / Shi, Xiao-kun (Autor:in) / Zhou, En-guo (Autor:in) / Feng, Bo (Autor:in) / Sheng, Xu (Autor:in)
Applied Clay Science ; 180
19.06.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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