首先通过黏度增长法研究了二茂铁及二茂铁二甲醇(FDM)对端羟基聚丁二烯(HTPB)/甲苯二异氰酸酯(TDI)组成的推进剂体系流变速率的影响,发现FDM中的羟基会和HTPB中的羟基共同参与固化反应,使黏度对数-时间(lnη-t)的变化规律呈现为特征的具有不同斜率的"三折线".随后以FDM作为推进剂反应中的界面扩散标记物,通过光学显微镜观察其界面组分的扩散迁移宽度约为500 μm,依据界面组分特征化学基团的空间分布研究,通过显微红外技术测定的界面组分扩散宽度为250 μm.通过原子力显微镜检测到界面存在宽约37.5 μm的杨氏模量相对较低的过渡区域,表明存在由于界面组分的扩散迁移形成的界面弱区.剥离强度性能测试表明,在推进剂中添加FDM会降低推进剂/衬层界面的黏结强度,但其具有最大拉伸强度的衬层预固化时间由8 h减小为4 h.
Study on influence of ferrocene derivative additives on curing and bonding performance of propellant/liner interface
Firstly,the influence of ferrocene and ferrocene dimethanol(FDM)on the rheological rate of the propellant system composed of hydroxyl-terminated polybutadiene(HTPB)/toluene diisocyanate(TDI)was investigated by the viscosity growth method.It was found that hydroxyl groups in FDM and hydroxyl groups in HTPB would participate in the curing reaction,so that the change rule of logarithm of viscosity-time(lnη-t)was presented as a characteristic"triple fold line"with different slopes.Subsequently,FDM was used as the interfacial diffusion marker in the propellant reaction,and the diffusion and migration width of its interfacial components was observed to be about 500 μm by optical microscope.According to the study on the spatial distribution of the characteristic chemical groups of the interfacial components,the diffusion width of the interfacial components was determined to be 250 μm by microscopic infrared technique.The existence of a transition zone with a width of about 37.5 μm and relatively low Young's modulus at the interface was detected by atomic force microscope,indicating the existence of interfacial weak zones formed due to the diffusion and migration of interfacial components.The peel strength performance tests showed that the addition of FDM to the propellant reduced the bonding strength of the propellant/liner interface,but the precuring time of the liner with maximum tensile strength was decreased from 8 h to 4 h.
diffusion and migration of interfacial componentferrocene dimethanolinterfacial bonding performance
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万方数据
维普
