纳米氢氧化铝填充LDPE/EVA的力学和阻燃性能

Mechanical properties and flame retardancy of CG-ATH/LDPE/EVA

对纳米氢氧化铝(CGATH)在低密度聚乙烯/乙烯醋酸乙烯酯共聚物体系中(lowdensitypolyethylene/ethylenevinylacetatecopolymer,简称LDPE/EVA),填充量对力学性质和阻燃性质的影响进行了研究.通过力学性能测试和SEM分析表明,随着CGATH填充量的增加,树脂体系的断裂伸长率急剧下降,而其拉伸强度则呈先下降后上升的趋势,当CGATH的填充量为60%时,其拉伸强度达12.5MPa.通过燃烧性能测试、TG和DSC分析表明,CGATH的添加能够提高树脂体系的分解温度,增加结炭率,显著提高极限氧指数.通过综合分析,得到填充量为60%时,能够达到树脂体系力学性能与燃烧性能的最佳状态.

The performances of LDPE/EVA （low density multiphase polymer blend filled with different amount polyethylene/ethylene vinyl acetate copolymer） of nano-aluminum trihydrate （CG-ATH） was investigated in this paper. The mass amount of CG-ATH filled into LDPE/EVA composites ranged from 10% to 70%. Tests results of mechanical properties showed that the elongation at break dropped sharply and the tensile strength dropped at first and went up later. The tensile strength of the composites of CG- ATH/LDPE/EVA reached 12.5 MPa when the amount of CG-ATH got to 60%. Through analysis of SEM photos, the consistent property between CG-ATH and LDPE/EVA multiphase polymer blend can be seen. Results also showed that although CG-ATH was not consistent to the blend, nanoparticles added could strengthen the blend. Tests of flame retardancy and analysis of TG and DSC showed that the addition of CG-ATH increased decomposition temperature of the composite, from 221.6 ℃ to 267.8℃. At the same time coking rate and limiting oxygen index （LOI） increased. Optimum mechanical properties and flame retardancy of the composites could be obtained at the CG-ATH＇s amount of 60%.