【摘要】 采用低场核磁共振技术检测了35～80℃时,燃料、不含固相的半成品的横向弛豫时间T₂。利用扫描电镜观察了其微观结构。结果表明,Al粉的加入限制了高分子的运动空间、降低了溶剂烃的迁移速率,使得燃料的T₂值及分散度远小于半成品;随着检测温度的升高,半成品的T₂初始值增加,而燃料的T₂初始值基本不变;随着加热时间的延长,半成品的T₂值先增加后逐渐减少至定值,而燃料的T₂值没有增加;计算加热3 h后T₂值减少速率α,α发生突跃的温度是凝胶液化最低温度(T_gel)。燃料、半成品的T_gel分别是80℃和70℃。更多还原

【Abstract】 To study the gelation thermal stability of gel-solid-liquid fuel（hereafter referred to as fuel） and determine the high temperature extreme value temporarily stored in the field during combat readiness duty,low-field NMR was used to detect 35～80 ℃.The transverse relaxation time T₂ of fuel and non-solid semifinished products（hereafter referred to as materiel） were detected,and its microstructure was observed by scanning electron microscope.The results show that the addition of Al powder limits the movement space of polymer,reduces the migration rate of solvent,and makes the T₂ value and dispersion of fuel much smaller than that of material.With the increase of detection temperature,the initial T₂ value of material increases,while the initial T₂ value of fuel basically remains unchanged.With the prolongation of heating time,the T₂ value of material increases first and then decreases gradually to a fixed value,while the T₂ of fuel does not increase.The reduction rate α of T₂ was calculated after 3 hours of heating.The temperature of αjumped was the minimum temperature of gel liquefaction T_gel.Fuel and material T_gel are 80 and 70 ℃,respectively.更多还原