提高高燃速丁羟推进剂低温伸长率研究

运用单向拉伸、交联密度测试、动态力学分析(DMA)等实验手段，研究了IPDI丁羟高燃速推进剂低温伸长率偏低的问题。结果表明：由于固化剂IPDI的分子结构特点和低反应活性造成粘合剂体系固化反应速度上的差别，加上防老剂H的刚性和物理交联作用使该类推进剂低温抗拉强度过高，是造成该类推进剂低温伸长率偏低的主要原因。在此基础上，通过添加网络调节剂，改善了推进剂粘合剂相的网络结构，解决了该问题。

Improvement of low temperature elongation ratio of high-burning rate HTPB propellant

With the methods of uniaxial testing, DMA, crosslinking density, etc., the low temperature elongation ratio of high-burning rate HTPB/IPDI propellant is usually poorer than that at either high or room temperature was studied. Results show that the main reason is the difference of curning reaction in the binder system due to the weak reaction activity and the molecular structure character of IPDI. In addition, the harden property and physcial crosslinking of antioxidants H also affects low temperature elongation ratio of this propellant.The problem was solved by adding network modifier to improve network structure of propellant binder.