Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/65723
Title: Effect of electron beam irradiation and microencapsulation on the flame retardancy of ethylene-vinyl acetate copolymer materials during hot water ageing test
Authors: Sheng, H
Zhang, Y
Wang, B
Yu, B
Shi, Y
Song, L
Kundu, CK
Tao, Y
Jie, G
Feng, H
Hu, Y
Keywords: Ageing test
Ammonium polyphosphate
Electron beam irradiation
Ethylene-vinyl acetate copolymer
Flame retardancy
Microencapsulation
Issue Date: 2017
Publisher: Pergamon Press
Source: Radiation physics and chemistry, 2017, v. 133, p. 1-8 How to cite?
Journal: Radiation physics and chemistry 
Abstract: Microencapsulated ammonium polyphosphate (MCAPP) in combination with polyester polyurethane (TPU) was used to flame retardant ethylene-vinyl acetate copolymer (EVA). The EVA composites with different irradiation doses were immersed in hot water (80 °C) to accelerate ageing process. The microencapsulation and irradiation dose ensured positive impacts on the properties of the EVA composites in terms of better dimensional stability and flame retardant performance. The microencapsulation of APP could lower its solubility in water and the higher irradiation dose led to the more MCAPP immobilized in three dimensional crosslinked structure of the EVA matrix which could jointly enhance the flame retardant and electrical insulation properties of the EVA composites. So, the EVA composites with 180 kGy irradiation dose exhibited better dimensional stability than the EVA composites with 120 kGy due to the higher crosslinking degree. Moreover, the higher irradiation dose lead to the more MCAPP immobilizated in crosslinked three-dimensional structure of EVA, enhancing the flame retardancy and electrical insulation properties of the EVA composites. After ageing test in hot water at 80 °C for 2 weeks, the EVA/TPU/MCAPP composite with 180 kGy could still maintain the UL-94 V-0 rating and the limiting oxygen index (LOI) value was as high as 30%. This investigation indicated the flame retardant EVA cable containing MCAPP could achieve stable properties and lower electrical fire hazard risk during long-term hot water ageing test.
URI: http://hdl.handle.net/10397/65723
ISSN: 0969-806X
EISSN: 1879-0895
DOI: 10.1016/j.radphyschem.2016.11.018
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