Effect of Ni cations and microwave hydrothermal treatment on the related properties of layered double hydroxide–ethylene vinyl acetate copolymer composites

Wang, Lili; Li, Bin; Yang, Mei; Chen, Chunxia; Liu, Yongsheng

doi:10.1016/j.jcis.2011.01.048

Cited by 17 publications

(11 citation statements)

References 59 publications

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“…In addition, the Ni-based LDH' catalysts are highly active and cost-effective in the partial oxidation and steam reforming of methane to produce H 2 [41,42]. Furthermore, in our previous report, Ni-containing MgAl-LDH showed obviously higher flame retardant efficiency in comparison with MgAl-LDH in the ethylene vinyl acetate (EVA) matrix [32,35]. However, the flame retardancy and smoke suppression of the Ni-containing MgAl LDH in the PP matrix have not been reported.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the generated char residue and mixed metal oxide can protect the bulk polymer from air exposure and suppress the release of smoke [26][27][28][29]. Therefore, LDH has attracted considerable attention as a flame retardant and thermal stabilizer [30][31][32][33][34][35][36][37][38]. In particular, Wang et al confirmed that MgAl LDH and CoAl LDH can efficiently improve the flame retardancy of PP [39,40].…”

Section: Introductionmentioning

confidence: 99%

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Thermal Stability, Combustion Behavior, and Mechanical Property in a Flame-Retardant Polypropylene System

2017

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Abstract:In order to comprehensively improve the strength, toughness, flame retardancy, smoke suppression, and thermal stability of polypropylene (PP), layered double hydroxide (LDH) Ni 0.2 Mg 2.8 Al-LDH was synthesized by a coprecipitation method coupled with the microwave-hydrothermal treatment. The X-ray diffraction (XRD), morphology, mechanical, thermal, and fire properties for PP composites containing 1 wt %-20 wt % Ni 0.2 Mg 2.8 Al-LDH were investigated. The cone calorimeter tests confirm that the peak heat release rate (pk-HRR) of PP-20%LDH was decreased to 500 kW/m 2 from the 1057 kW/m 2 of PP. The pk-HRR, average mass loss rate (AMLR) and effective heat of combustion (EHC) analysis indicates that the condensed phase fire retardant mechanism of Ni 0.2 Mg 2.8 Al-LDH in the composites. The production rate and mean release yield of CO for composites gradually decrease as Ni 0.2 Mg 2.8 Al-LDH increases in the PP matrix. Thermal analysis indicates that the decomposition temperature for PP-5%LDH and PP-10%LDH is 34 • C higher than that of the pure PP. The mechanical tests reveal that the tensile strength of PP-1%LDH is 7.9 MPa higher than that of the pure PP. Furthermore, the elongation at break of PP-10%LDH is 361% higher than PP. In this work, the synthetic LDH Ni 0.2 Mg 2.8 Al-LDH can be used as a flame retardant, smoke suppressant, thermal stabilizer, reinforcing, and toughening agent of PP products.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Stability, Combustion Behavior, and Mechanical Property in a Flame-Retardant Polypropylene System

2017

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“…Furthermore, since the composition of the metal layers of LDHs can be varied, there are enormous potential applications as flame retardants [11]. Based on the above advantages of LDHs, we have paid significant attention to the design and preparation of LDHs as a non-halogenated additive of EVA [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…LDHs, we have paid significant attention to the design and preparation of LDHs as a nonhalogenated additive of EVA [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Flame Retardance and Smoke Suppression of CFA/APP/LDHs/EVA Composite

Wang

Shi

et al. 2016

Applied Sciences

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Abstract:A new intumescent flame-retardants (IFR) system including the charing-foaming agent (CFA), ammonium polyphosphate (APP) and modified-layered double hydroxides (LDHs) with different transition metals (Ni, Co, Cu) were used in the ethylene vinyl acetate (EVA) matrix. Both the limiting oxygen index and the vertical burning tests indicate that the CFA/APP system and LDHs have significant synergistic flame retardant effects. The morphology of combustion residues indicates that the many pores of residues can prevent the melt dripping. The thermal analysis shows that the flame retardants obviously enhanced the thermal degradation temperature of ethylene-based chains of the composites. The cone calorimeter test reveals that the CO 2 and combustion residues have an important influence on the reduction of heat release rate (HRR), the smoke production rate (SPR), the production rate and the mean release yield of CO. The composite containing Cu (ELDH-Cu) delivers an 82% reduction in peak heat release rate, while ELDH-Ni has the best CO suppression among all composites. This work not only confirms the flame retardance and smoke suppression of CFA/APP/LDH/EVA, but also provides an effective method for producing new flame retardants and smoke suppressants.

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“…In our previous report, Ni-containing MgAl-LDHs showed obviously higher flame retardant efficiency in comparison with alone MgAl-LDHs in the EVA matrix [41]. Therefore, for comparison purpose, a small amounts of stearate sodium surface modified Ni-containing LDHs and RE (La, Ce, Nd)-doped Ni-containing LDHs were synthesized by a coprecipitation method coupled with the microwave hydrothermal treatment in the present paper.…”

Section: Introductionmentioning

confidence: 91%

Effect of Rare Earth Ions on the Properties of Composites Composed of Ethylene Vinyl Acetate Copolymer and Layered Double Hydroxides

Wang

Zhao

et al. 2012

PLoS ONE

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BackgroundThe study on the rare earth (RE)-doped layered double hydroxides (LDHs) has received considerable attention due to their potential applications in catalysts. However, the use of RE-doped LDHs as polymer halogen-free flame retardants was seldom investigated. Furthermore, the effect of rare earth elements on the hydrophobicity of LDHs materials and the compatibility of LDHs/polymer composite has seldom been reported.Methodology/Principal FindingsThe stearate sodium surface modified Ni-containing LDHs and RE-doped Ni-containing LDHs were rapidly synthesized by a coprecipitation method coupled with the microwave hydrothermal treatment. The influences of trace amounts of rare earth ions La, Ce and Nd on the amount of water molecules, the crystallinity, the morphology, the hydrophobicity of modified Ni-containing LDHs and the adsorption of modifier in the surface of LDHs were investigated by TGA, XRD, TEM, contact angle and IR, respectively. Moreover, the effects of the rare earth ions on the interfacial compatibility, the flame retardancy and the mechanical properties of ethylene vinyl acetate copolymer (EVA)/LDHs composites were also explored in detail.Conclusions/SignificanceS-Ni0.1MgAl-La displayed more uniform dispersion and better interfacial compatibility in EVA matrix compared with other LDHs. Furthermore, the S-Ni0.1MgAl-La/EVA composite showed the best fire retardancy and mechanical properties in all composites.

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Effect of Ni cations and microwave hydrothermal treatment on the related properties of layered double hydroxide–ethylene vinyl acetate copolymer composites

Cited by 17 publications

References 59 publications

Thermal Stability, Combustion Behavior, and Mechanical Property in a Flame-Retardant Polypropylene System

Thermal Stability, Combustion Behavior, and Mechanical Property in a Flame-Retardant Polypropylene System

Flame Retardance and Smoke Suppression of CFA/APP/LDHs/EVA Composite

Effect of Rare Earth Ions on the Properties of Composites Composed of Ethylene Vinyl Acetate Copolymer and Layered Double Hydroxides

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