氢氧化铝对乙烯-丙烯酸丁酯共聚物力学与阻燃性能及热降解行为的影响

采用极限氧指数、热重分析（TG）和差示扫描景热分析（DSC）等技术和手段研究了乙烯-丙烯酸丁酯共聚物（EBA）／氢氧化铝（ATH）复合材料的阻燃性能和热降解行为，探讨了ATH的添加量对EBA力学性能和熔体流动速率的影响。实验数据表明，ATH的引入能恶化材料的力学性能和加工性能；但可提高材料的阻燃性能，当ATH的添加量为60％时，阻燃材料的极限氧指数可达33．1％。ATH提高了EBA在高温下的热稳定性，降低了EBA的热降解速率，扩大了热失熏温度范围。ATH以吸热方式在凝缩相和气相中发挥阻燃作用；此外，ATH分解形成的活性Al2O3对EBA还具有成炭催化作用，在一定程度上显示出了ATH的凝缩相阻燃作用。

Effect of Aluminum Trihydrate on Mechanical Properties, Flame Retardancy and Thermal Degradation Behaviour of Ethylene-Butyl Acrylate Copolymer

The flame retardancy of aluminum trihydrate(ATH)for the ethylene-butyl acrylate copoly- mer(EBA)was investigated,the thermal and mechanical properties of the compound system were stud- ied.The limiting oxygen index value of EBA was increased from 17.8% to 33.1% with 60 wt% load- ing of ATH.ATH decreased the thermal decomposition rate,and broadened the range of thermal de- composition temperature.The flame retardant action of ATH in EBA was via heat sink in both the gaseous and condensed phases.However,the reactive alumina(a Lewis acid)formed as the ATH lost water catalyzed the degradation of EBA,leading to higher char yield.Another negative effect of ATH was the deterioration of the mechanical and processing properties of EBA.