PBT基钝感低特征信号推进剂的力学性能优化研究  

Research on mechanical properties optimization of PBT⁃based insensitive low signature solid propellant

作　　者：李洋[1] 姜磊 尹必文[1] 宋琴[1] 刘宇俊 廖海东 LI Yang;JIANG Lei;YIN Biwen;SONG Qin;LIU Yujun;LIAO Haidong(Hubei Institute of Aerospace Chemical Technology,National Defense Science and Technology Key Laboratory,Xiangyang 441003,China;Xiangyang Sunvalor Aerospace Films Co.Ltd.,Xiangyang 441003,China)

机构地区：[1]湖北航天化学技术研究所国防科技重点实验室,襄阳441003 [2]襄阳三沃航天薄膜材料有限公司,襄阳441003

出　　处：《固体火箭技术》2021年第4期479-485,共7页Journal of Solid Rocket Technology

基　　金：装发部“十三五”预先研究专项基金资助。

摘　　要：采用单轴拉伸法和DSC法,研究了增塑比、扩链剂(BDO、PET、PEG)、交联剂(TN⁃J、TMP、PTT、T⁃PEG)对PBT/NENA/I⁃RDX(钝化RDX)/AP低Al体系钝感低特征信号推进剂力学性能和玻璃化转变温度的影响。结果表明,大分子扩链剂PEG可显著提高推进剂的最大伸长率,而抗拉强度基本不变;交联剂提高推进剂抗拉强度的作用大小依次为TN⁃J>TMP>PTT>T⁃PEG,其中TN⁃J可同时发挥键合作用,提高最大伸长率。当增塑比为2.0、综合调节TN⁃J和PEG的含量,推进剂20℃抗拉强度0.9~1.3 MPa、最大伸长率40%~70%,70℃抗拉强度0.6~0.7 MPa、最大伸长率30%~50%,-55℃最大抗拉强度3.7~4.6 MPa、最大伸长率45%~75%,玻璃化转变温度<-65℃,推进剂在-55~70℃时具有良好的力学性能,可满足工程化应用的需求。Uniaxial stretching method and Differential Scanning Calorimetry(DSC)were used to investigate the influence of plasticization ratio,chain extender(BDO,PET,PEG)and cross⁃linking agent on the mechanical properties and Tg of PBT/NENA/I⁃RDX(Insensitive⁃RDX)/AP insensitive low signature solid propellant.The results show that the macromolecular cross⁃linking a⁃gent apparently improve the maximum elongation with little loss of tensile strength.In aspects of improving the tensile strength,the cross⁃linking agents in turns are TN⁃J>TMP>PTT>T⁃PEG.The TN⁃J acted as a bonding agent is beneficial to improve the maximum elongation.When the plasticization ratio is 2.0 together with a comprehensive adjustment of the content of TN⁃J and PEG,the ten⁃sile strength of PBT⁃based propellant at 20℃,70℃and-55℃is 0.9~1.3 MPa,0.6~0.7 MPa,3.7~4.6 MPa,respectively,and the maximum elongation is 40%~70%,30%~50%,45%~75%,respectively,accompanying with a Tg lower than-65℃and an excellent mechanical properties at-55~70℃,where requirements in the practical engineering applications can be met.

关 键 词：PBT推进剂 力学性能 增速比 扩链剂 交联剂 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]