Flammability Characterization and Effects of Magnesium Oxide in Halogen-free Flame-retardant EVA Blends

The effects of magnesium oxide （MgO） on the flame retardant performance of intumescent systems based on ammonium polyphosphate （APP） and pentaerythritol （PER） in ethylene vinyl acetate copolymer （EVA） were studied. The results showed that MgO affects both the quality and quantity of residual char. T...

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Bibliographic Details
Published in:Chinese journal of polymer science 2015-12, Vol.33 (12), p.1683-1690
Main Authors: Zhang, Yan, Peng, Rui-qun, Zhou, Guang-da, Fang, Zheng-ping, Li, Xiao-nan
Format: Article
Language:English
Subjects:
Blends
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Combustion
Condensed Matter Physics
Copolymers
Ethylene vinyl acetates
Flammability
Industrial Chemistry/Chemical Engineering
Intumescent
LOI值
Magnesium oxide
Polymer Sciences
Ratings
乙烯-醋酸乙烯共聚物
共混物
无卤阻燃
氧化镁
燃烧性能
膨胀体系
阻燃性能
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Summary:The effects of magnesium oxide （MgO） on the flame retardant performance of intumescent systems based on ammonium polyphosphate （APP） and pentaerythritol （PER） in ethylene vinyl acetate copolymer （EVA） were studied. The results showed that MgO affects both the quality and quantity of residual char. There is an optimal value for the loading amount of MgO. More or less MgO loading may cause the formation of defective char layers and worsen the flame retardancy of EVA. According to the results of limiting oxygen index （LOI）, vertical flammability test （UL94 rating） and cone calorimetry （CONE）, the best flame retardancy with a strong and well intumescent char is obtained from the sample with 1 wt% of MgO, which has the highest LOI value of 27.9, UL94 rating of V-0 and the lowest peak heat release rate of 242 kW·m-2.
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-015-1722-z