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Improvement of mechanical properties of in situ-prepared HTPE binder in propellants

机译：在推进剂中提高原位HTPE粘合剂的机械性能

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A new type of hydroxyl-terminal block copolymer (HTPE) binder with excellent mechanical properties was prepared using an in situ preparation method. Compared with traditional HTPE binder preparation, this method involves relatively simple operations, which not only reduces costs, but also does not require a complicated synthesis process to prepare the HTPE prepolymer intermediate. Thus, it is expected to replace the binder for HTPE propellants. The mechanical properties, crosslinking density, hydrogen bonding, and thermal performances of the prepared HTPE binders were investigated through tensile testing, low-field nuclear magnetic resonance (LF-NMR), Fourier-transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC) analysis. The ultimate tensile strength ( σ _(m) ) of the in situ -prepared HTPE binder was 1.83 MPa, the fracture elongation ( ε _(b) ) was 371.61%, and the strength increased by 80% compared to the HTPE binders. The crosslink density ( V _(e) ) decreased with an increasing content of PEG and/or TDI. The proportion of H-bonds formed by the imino groups increased with the content of PEG and TDI and reached 81.49% at PEG and TDI contents of 50% and 80%, respectively, indicating a positive correlation between the H-bonds and σ _(m) . Based on the statistical theory of elasticity, the integrity of the curing networks showed that the contents of PEG and TDI affected the integrity of the curing networks. The DSC data of the in situ -prepared HTPE binder showed a lower glass transition temperature. Finally, compared to HTPE propellant, the strength and elongation of the in situ -prepared HTPE propellant increased by 206% and 135%, respectively. This exciting result greatly enhances the feasibility of the in situ HTPE preparation method.
机译：使用原位制备方法制备具有优异机械性能的新型羟基末端嵌段共聚物（HTPE）粘合剂。与传统的HTPE粘合剂制备相比，该方法涉及相对简单的操作，不仅降低了成本，而且还不需要复杂的合成方法来制备HTPE预聚物中间体。因此，预计将代替HTPE推进剂的粘合剂。通过拉伸检测，低场核磁共振（LF-NMR），傅里叶变换红外光谱（FTIR）和差示扫描量热法研究制备的HTPE粘合剂的机械性能，交联密度，氢键和热性能，以及差示扫描量热法（ DSC）分析。原位制备的HTPE粘合剂的最终拉伸强度（σ_（m））为1.83MPa，与HTPE粘合剂相比，断裂伸长（ε_（b））为371.61％，强度增加了80％。交联密度（V _（e））随着PEG和/或TDI的增加而降低。由亚氨基形成的H键的比例随PEG和TDI的含量而增加，PEG和TDI含量分别达到81.49％，分别为50％和80％，表明H键与σ_（ m）。基于弹性的统计理论，固化网络的完整性表明，PEG和TDI的内容影响了固化网络的完整性。原位预备的HTPE粘合剂的DSC数据显示出较低的玻璃化转变温度。最后，与HTPE推进剂相比，原位浸润的HTPE推进剂的强度和伸长程度分别增加了206％和135％。这种激动人心的结果极大地提高了原位HTPE制备方法的可行性。

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