将以改性季戊四醇(MPER)为成炭剂的膨胀型阻燃剂(IFR)与乙烯-醋酸乙烯共聚物(EVA)通过熔融共混法制得了辐照交联聚烯烃复合材料,通过极限氧指数仪、高阻计、击穿测试仪和热失重分析仪研究了复合材料的阻燃性能、电性能及热稳定性.结果表明,MPER代替季戊四醇(PER)作为聚烯烃体系的成炭剂后,阻燃剂总添加量为40％、辐照剂量小于90 kGy时,与辐照前相比EVA/IFR-MPER体系的阻燃性能、击穿场强、体积电阻率、最大分解温度、600℃时残炭率分别提高了1、5％、2.2 MV/m、0.6×1013Ω·m、4.43℃、8.52％.%Irradiation-crosslinked polyolefin composites were prepared by ethylene-vinyl acetate copolymer with intumescent flame retardant (IFR)of modified pentaerythritol as char-forming agent through melt blending,and their flame retardant performance,electrical properties and thermal stability were investigated by limiting oxygen index,high resistance meter,breakdown tester and thermogravimetic analysis.The results indicated that,when 40 wt ％ of the complex flame retardants was introduced and the irradiation dose was less than 90 kGy,the resulting EVA/IFR-MPER systems achieved an improvement in flame retardancy by 1.5 ％.Furthermore,their breakdown field strength,volume resistivity,maximum decomposition temperature and carbon yield at 600 ℃ increased by 2.2 MV/m,0.6 × 1013 Ω · m,4.43 ℃ and 8.52 ％,respectively.
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