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
Aging of a solid composite propellant containing HTPB/AP/AL was performed in order to validate the conformance of the accelerated aging data to the Arrhenius law. The main objective of the work was to examine the infl...Aging of a solid composite propellant containing HTPB/AP/AL was performed in order to validate the conformance of the accelerated aging data to the Arrhenius law. The main objective of the work was to examine the influence of the aziridine bonding agents family on the propellant aging. Aging of the prepared propellant samples was conducted as follows: 1. Four samples, one free of bonding agents, and three containing aziridine based bonding agents MAPO,HX-752, MAT4 were aged at 65°C. 2. Another four samples based on HX-752, MAT4 with different curing agents were aged at 65°C. The measured mechanical properties of the free bonding agent propellant samples were very far from the specifications and this illustrates the importance of the bonding agents in both the preparation and the aging phases.The prepared bonding agent 'MAT4' gave remarkable improvements of the mechanical properties comparing with HX-752 and MAPO. The aziridine bonding agents family inhibited the rate of decomposition of the propellant during the aging periods and supported the propellant matrix against decomposition at the elevate temperatures. Using of HMDI as curing agent gave slight better mechanical properties to the IPDI.展开更多
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。
文摘Aging of a solid composite propellant containing HTPB/AP/AL was performed in order to validate the conformance of the accelerated aging data to the Arrhenius law. The main objective of the work was to examine the influence of the aziridine bonding agents family on the propellant aging. Aging of the prepared propellant samples was conducted as follows: 1. Four samples, one free of bonding agents, and three containing aziridine based bonding agents MAPO,HX-752, MAT4 were aged at 65°C. 2. Another four samples based on HX-752, MAT4 with different curing agents were aged at 65°C. The measured mechanical properties of the free bonding agent propellant samples were very far from the specifications and this illustrates the importance of the bonding agents in both the preparation and the aging phases.The prepared bonding agent 'MAT4' gave remarkable improvements of the mechanical properties comparing with HX-752 and MAPO. The aziridine bonding agents family inhibited the rate of decomposition of the propellant during the aging periods and supported the propellant matrix against decomposition at the elevate temperatures. Using of HMDI as curing agent gave slight better mechanical properties to the IPDI.
