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Appl. Sci. 2016, 6(5), 131; doi:10.3390/app6050131

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

1,2
,
1
and
2,*
1
College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
2
College of Science, Northeast Forestry University, Harbin 150040, China
*
Author to whom correspondence should be addressed.
Academic Editor: Giorgio Biasiol
Received: 2 April 2016 / Revised: 24 April 2016 / Accepted: 27 April 2016 / Published: 4 May 2016
(This article belongs to the Section Materials)
View Full-Text   |   Download PDF [5755 KB, uploaded 4 May 2016]   |  

Abstract

The effects of transition metals on the hydrophobicity of nano–structured layered double hydroxides (LDHs) and the compatibility of LDHs/ethylene vinyl acetate (EVA) composites have seldom been reported. NiMgAl–LDHs slightly surface–modified with stearate and doped with transition metal cations (Mn2+, Co2+, Cu2+, Zn2+) are investigated. Compared to the pure EVA, not only were the maximal degradation–rate temperatures (Tmax) of the ethylene–based chains enhanced, but also the smoke production rate (SPR) and the production rate of CO (COP) were sharply decreased for all the composites. Most importantly, a new flame retardant mechanism was found, namely the peak heat release rate (pk-HRR) time, which directly depends on the peak production rate of CO2 (pk-CO2) time for EVA and all composites by cone calorimeter test. Moreover, the Mn–doped LDH S–NiMgAl–Mn shows more uniform dispersion and better interfacial compatibility in the EVA matrix. The cone calorimetric residue of S–NiMgAl–Mn/EVA has the intumescent char layer and the compact metal oxide layer. Therefore, S–NiMgAl–Mn/EVA shows the lowest pk-HRR and the longest pk-HRR time among all the composites. View Full-Text
Keywords: transition metals; interfacial compatibility; layered double hydroxides; ethylene vinyl acetate copolymer; flame retardancy; thermal stability transition metals; interfacial compatibility; layered double hydroxides; ethylene vinyl acetate copolymer; flame retardancy; thermal stability
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Wang, L.; Zhang, M.; Li, B. Thermal Analysis and Flame-Retarded Mechanism of Composites Composed of Ethylene Vinyl Acetate and Layered Double Hydroxides Containing Transition Metals (Mn, Co, Cu, Zn). Appl. Sci. 2016, 6, 131.

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