摘要
对分别加入0%、2%和4%燃速催化剂Ct的某推进剂A、B、C 3个体系,应用低场核磁共振技术(LF-NMR)分别在线监测50、60、70℃固化反应,通过聚合物氢质子横向弛豫时间T2进行固化反应动力学研究。结果显示,T2与体系固化反应程度有相关性,可在线监测样品固化反应的初期、中期和末期;3个体系在反应初期、中期均表现为一级动力学反应;各体系的反应初期的表观反应活化能Ea均大于反应中期,说明2个阶段的反应机理不同;提高固化温度能增加反应速率常数k、缩短固化时间,但不影响固化反应规则,没有改变交联网络的组成;同一固化温度下,随着Ct含量增大,k值增加、固化时间缩短,说明Ct对固化反应有催化作用,含量越高,催化作用越大,但过多的Ct会影响交联剂体系的链反应规则,一定程度上改变了推进剂的空间网络结构。
The propellants with 0%,2% and 4% combustion catalyst（ Ct） named A,B and C were prepared. The kinetic of the curing reactions was investigated by LF-NMR with monitoring the transversal relaxation time（ T2） of the hydrogen proton in the systems of A,B and C on line. The results show that the whole process of the curing reaction can be monitored by LF-NMR because of the correlation between T2 and the degree of the curing reaction. The initial and medium reaction stages of three systems all appear as first-order kinetic reaction,but the Ea（ apparent reaction active energy） of the initial stage was higher than that of the medium stage,which shows the different reaction mechanism of them. The increase of the reaction temperature could speed up the rate and shorten the time of curing reaction,as well as keep the curing reaction rules and crosslinked network structure. Under the same reaction temperature,the reaction rate was increased and the reaction time was shortened along with the increase of the content of Ct,which shows the curing reaction was catalyzed by Ct,but the rule of chain reaction and the space network structure would be affected to a certain extent because of excessive amounts of Ct.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2015年第5期697-701,706,共6页
Journal of Solid Rocket Technology
基金
总装"十二五"火炸药预研基金(40406010102)
