Enhancing the Performance of an HTPE Binder by Adding a Novel Hyperbranched Multi‐Arm Azide Copolyether,Propellants, Explosives, Pyrotechnics

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Enhancing the Performance of an HTPE Binder by Adding a Novel Hyperbranched Multi‐Arm Azide Copolyether
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-03-25 , DOI: 10.1002/prep.201900374
Xiaomu Wen ₁ , Guangpu Zhang ₁ , Keke Chen ₁ , Shen Yuan ₁ , Yunjun Luo _{1,

2}

Affiliation

Modern composite solid propellants must exhibit excellent mechanical properties together with high energy outputs, and the binder system plays a vital role in establishing these characteristics. In the present work, varying proportions of a novel hyperbranched multi‐arm azide copolyether (POG) were combined with a hydroxyl‐terminated polyether (HTPE) to prepare crosslinked elastomeric binders. The compatibility of the POG and HTPE was demonstrated before a series of HTPE/POG blend binders were prepared based on a urethane reaction using hexamethylene diisocyanate (HMDI) as the curing agent. The mechanical properties of HTPE/POG/HMDI elastomers were found to be superior to those of traditional HTPE/N100 crosslinked binders as a result of the formation of a hyperbranched crosslink structure. Evaluations of the local motions of polymers chains and parameters related to the cured network structure demonstrated the advantages of introducing the hyperbranched POG. Hydrogen bonding in the HTPE/POG/HMDI binder was investigated and the results confirmed that these elastomers also benefited from hydrogen bonding, as well as the entanglement and interpenetration of molecular chains. Decomposition behavior was studied by thermogravimetric analysis, differential thermogravimetry and differential scanning calorimetry, and the new binders exhibited good thermal stability and superior energetic performance that could potentially meet the requirements for military applications.

中文翻译：

通过添加新型的超支化多臂叠氮化物共聚醚来增强HTPE粘合剂的性能

现代复合固体推进剂必须具有出色的机械性能以及高能量输出，而粘合剂体系在确立这些特性方面起着至关重要的作用。在当前的工作中，将不同比例的新型超支化多臂叠氮化物共聚醚（POG）与羟基封端的聚醚（HTPE）混合以制备交联的弹性体粘合剂。在使用六亚甲基二异氰酸酯（HMDI）作为固化剂基于氨基甲酸酯反应制备一系列HTPE / POG共混粘合剂之前，要证明POG与HTPE的相容性。由于形成了超支化交联结构，因此发现HTPE / POG / HMDI弹性体的机械性能优于传统的HTPE / N100交联粘合剂。聚合物链的局部运动和与固化网络结构相关的参数的评估证明了引入超支化POG的优势。对HTPE / POG / HMDI粘合剂中的氢键进行了研究，结果证实这些弹性体也受益于氢键以及分子链的缠结和互穿。通过热重分析，差示热重分析和差示扫描量热法研究了分解行为，新粘合剂表现出良好的热稳定性和优异的能量性能，可以潜在地满足军事应用的要求。对HTPE / POG / HMDI粘合剂中的氢键进行了研究，结果证实这些弹性体也受益于氢键以及分子链的缠结和互穿。通过热重分析，差示热重分析和差示扫描量热法研究了分解行为，新粘合剂表现出良好的热稳定性和优异的能量性能，可以潜在地满足军事应用的要求。对HTPE / POG / HMDI粘合剂中的氢键进行了研究，结果证实这些弹性体也受益于氢键以及分子链的缠结和互穿。通过热重分析，差示热重分析和差示扫描量热法研究了分解行为，新粘合剂表现出良好的热稳定性和优异的能量性能，可以潜在地满足军事应用的要求。

更新日期：2020-03-25

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