Citation: Yan Zhang, Rui-qun Peng, Guang-da Zhou, Zheng-ping Fang, Xiao-nan Li. Flammability Characterization and Effects of Magnesium Oxide in Halogen-free Flame-retardant EVA Blends[J]. Chinese Journal of Polymer Science, ;2015, 33(12): 1683-1690. doi: 10.1007/s10118-015-1722-z shu

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

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Lab of Polymer Materials and Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
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Hangzhou First PV Material Co., Ltd., Hangzhou 311300, China
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1. Lab of Polymer Materials and Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
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2. MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
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Corresponding author: Guang-da Zhou,
Received Date: 13 May 2015
Revised Date: 23 July 2015

Fund Project: This work was financially supported by the National Natural Science Foundation of China(No.51203136) and the Scientific Special Fund of Zhejiang Province(No.2013C01074).

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 kWm-2.
- Flammability,
- Magnesium oxide,
- Flame retardancy,
- Ethylene vinyl acetate copolymer,
- Intumescence
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