The thermal degradation of poly (ethylene terephthalate)(PET) and phosphorus containing copolyester,obtained from the polycondensation of terephthalate acid,ethylene glycol and 2 carboxyethyl (phenyl phosphinic) acid ...The thermal degradation of poly (ethylene terephthalate)(PET) and phosphorus containing copolyester,obtained from the polycondensation of terephthalate acid,ethylene glycol and 2 carboxyethyl (phenyl phosphinic) acid in air were studied by thermogravimetric analysis(TG) in order to determine the activation energy of phosphorus containing copolyester and PET.The activation energy was determined using Kissinger method and Flynn Wall Ozawa method,withaut the knowledge of the reaction mechanism(RM),giving the values 219.18～229.65kJ/mol and 217.61～238.85kJ/mol respectively.The results show that there is little difference between the values of thermogravimetric activation energy of phosphorus containing copolyester and PET,both of the reaction mechanism are same.展开更多
通过复分解反应合成了三种2-羧乙基苯基次膦酸盐(CEPCA、CEPAL、CEPSN)阻燃剂,其化学结构被傅里叶红外光谱(FTIR)、核磁共振氢谱( 1 H NMR)与元素分析所表征。随后,它们被分别加入尼龙6中制备阻燃复合材料(FRPA6),利用热重分析(TG)、垂...通过复分解反应合成了三种2-羧乙基苯基次膦酸盐(CEPCA、CEPAL、CEPSN)阻燃剂,其化学结构被傅里叶红外光谱(FTIR)、核磁共振氢谱( 1 H NMR)与元素分析所表征。随后,它们被分别加入尼龙6中制备阻燃复合材料(FRPA6),利用热重分析(TG)、垂直燃烧测试、极限氧指数( LOI )测试和扫描电子显微镜(SEM)对FRPA6的热性能、阻燃性能与残炭形貌进行了分析。结果表明,三种次膦酸盐的热稳定性较2-羧乙基苯基次膦酸(CEPPA)都有较大提升,CEPCA的热分解温度( T -5%)上升最明显,由223.4 ℃上升到539.1 ℃。从阻燃性能看,CEPAL的阻燃性能最佳,在添加量为20%时,其 LOI 为32.1%并达到UL94 V-1等级。CEPAL阻燃性能更好的原因在于,其燃烧后生成了更加致密、完整的炭层,这种炭层能有效隔热隔氧从而中断燃烧行为。展开更多
文摘The thermal degradation of poly (ethylene terephthalate)(PET) and phosphorus containing copolyester,obtained from the polycondensation of terephthalate acid,ethylene glycol and 2 carboxyethyl (phenyl phosphinic) acid in air were studied by thermogravimetric analysis(TG) in order to determine the activation energy of phosphorus containing copolyester and PET.The activation energy was determined using Kissinger method and Flynn Wall Ozawa method,withaut the knowledge of the reaction mechanism(RM),giving the values 219.18～229.65kJ/mol and 217.61～238.85kJ/mol respectively.The results show that there is little difference between the values of thermogravimetric activation energy of phosphorus containing copolyester and PET,both of the reaction mechanism are same.
文摘通过复分解反应合成了三种2-羧乙基苯基次膦酸盐(CEPCA、CEPAL、CEPSN)阻燃剂,其化学结构被傅里叶红外光谱(FTIR)、核磁共振氢谱( 1 H NMR)与元素分析所表征。随后,它们被分别加入尼龙6中制备阻燃复合材料(FRPA6),利用热重分析(TG)、垂直燃烧测试、极限氧指数( LOI )测试和扫描电子显微镜(SEM)对FRPA6的热性能、阻燃性能与残炭形貌进行了分析。结果表明,三种次膦酸盐的热稳定性较2-羧乙基苯基次膦酸(CEPPA)都有较大提升,CEPCA的热分解温度( T -5%)上升最明显,由223.4 ℃上升到539.1 ℃。从阻燃性能看,CEPAL的阻燃性能最佳,在添加量为20%时,其 LOI 为32.1%并达到UL94 V-1等级。CEPAL阻燃性能更好的原因在于,其燃烧后生成了更加致密、完整的炭层,这种炭层能有效隔热隔氧从而中断燃烧行为。
