A novel hydroxyl‐terminated block copolymer (HTPE) binder was prepared through an in situ preparation method to replace the traditional HTPE binder. The preparation method is less costly and bypasses the preparation of the HTPE prepolymer intermediate, thus avoiding the complicated prepolymer synthesis process. Uniaxial tensile testing, low‐field nuclear magnetic resonance, and infrared spectroscopy were used to investigate the mechanical properties, curing networks, and hydrogen bonding (H‐bonds) of the binder. The crosslink density (Ve) decreased with an increase in the ratio of −NCO in the IPDI to the total −NCO in the IPDI and N100 (χ). The proportion of H‐bonds formed by the imino groups increased with the IPDI content and reached 86.53 % at a χ value of 90 %, indicating a positive correlation between the H‐bonds and σ_m. Additionally, to study the pot life of the in situ‐prepared HTPE binder, the rheological properties of the curing reactions were studied. When the χ value was in the range of 50 %–90 %, the pot life of the binder met the composite propellant requirements for military applications. The thermal decomposition behaviors of the in situ‐prepared HTPE binder and the traditional HTPE binder were investigated by the coupling analysis of thermogravimetry‐Fourier transform infrared spectroscopy (TG‐FTIR), and the novel in situ‐prepared HTPE binder exhibited good thermal stability and superior energetic performance. Compared with the traditional HTPE‐based propellant, the mechanical properties of the in situ‐prepared‐HTPE‐based propellants were greatly improved. With these data, the in situ‐prepared HTPE binder has great potential for application in rocket propellant formulations.

中文翻译：

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异氰酸酯混合固化剂对推进剂中原位制备HTPE粘合剂性能的影响

通过原位制备方法制备了一种新型的端羟基嵌段共聚物（HTPE）粘合剂，以代替传统的HTPE粘合剂。该制备方法成本较低，并且无需制备HTPE预聚物中间体，从而避免了复杂的预聚物合成过程。单轴拉伸试验，低场核磁共振和红外光谱用于研究粘合剂的机械性能，固化网络和氢键（氢键）。交联密度（Ve）随IPDI中的-NCO与IPDI和N100中的总-NCO之比的增加而降低（χ）。的氢键通过亚氨基形成的比例增加与IPDI含量和在90％的χ值达到86.53％，这表明了H-键之间的正相关性和σ_米。另外，为了研究原位制备的HTPE粘合剂的适用期，还研究了固化反应的流变性质。当χ值在50％–90％范围内时，粘合剂的适用期满足军事应用中复合推进剂的要求。通过热重-傅立叶变换红外光谱（TG-FTIR）的耦合分析，研究了原位制备的HTPE粘合剂和传统HT​​PE粘合剂的热分解行为，该新型原位制备的HTPE粘合剂具有良好的热稳定性和稳定性。出色的精力充沛的表现。与传统的基于HTPE的推进剂相比，原位制备的基于HTPE的推进剂的机械性能得到了极大的改善。有了这些数据，