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Journal of Fire Sciences
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Flammability Properties of {gamma}-irradiated Intumescent Flame-retardant HDPE/EVA Composites

Hongdian Lu

Department of Chemical and Material Engineering Hefei University, Hefei Anhui 230022, P. R. China, lu_hd{at}ustc.edu

Quanzheng Zhang

Department of Chemical and Material Engineering Hefei University, Hefei Anhui 230022, P. R. China

Yuanu Hu

State Key Laboratory of Fire Science University of Science and Technology of China Hefei, 230026 Anhui, P. R. China

The influence of {gamma}-irradiation on high density polyethylene/ ethylene—vinyl acetate copolymer composites consisting of ammonium polyphosphate and nylon 6 as intumescent flame-retardant additives is investigated. Cone calorimetry, thermogravimetric analysis, and Fourier transform infrared have been performed to characterize their flammability and thermal properties. The irradiated samples show slight reduction in peak heat release rate at suitable irradiation dose levels but exhibit less efficiency in fire protection in comparison with the non-irradiated sample. Thermogravimetric analysis results indicate that the irradiated samples have a higher thermal-oxidative stability than that of the non-irradiated sample. The intermolecular cross-links of the composites induced by {gamma}-rays are suggested to be responsible for these behaviors.

Key Words: polyethylene • intumescent flame-retardant • {gamma}-irradiation.

Journal of Fire Sciences, Vol. 25, No. 6, 499-508 (2007)
DOI: 10.1177/0734904107081344
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