氟醇接枝提高端羟基聚醚聚氨酯弹性体的氧化性,Propellants, Explosives, Pyrotechnics

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氟醇接枝提高端羟基聚醚聚氨酯弹性体的氧化性
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2022-05-31 , DOI: 10.1002/prep.202200048
Chen Shen ₁ , Shi Yan ₁ , Xiaole Sun ₂ , Yanwei Tan ₂ , Yapeng Ou ₁ , Qingjie Jiao ₁

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采用两步法合成了一系列氟代醇接枝端羟基聚醚（HTPE）聚氨酯（PU）弹性体。通过化学滴定法和傅里叶变换红外光谱（FTIR）研究了反应进程。测定了玻璃化转变温度（Tg）、力学性能、形貌和热分解行为，用于聚氨酯的初步分析；通过PU/Al复合材料的分解测试氧化性能。力学和形貌性能的结果表明，改性PU弹性体的机械强度有效提高了硬链段的微相分离。具有优化的氟醇含量的 PU 薄膜在室温下表现出 17.7 MPa（拉伸强度）和 547 %（断裂伸长率）的优异性能。对热行为的分析表明，氟的强电负性增强了改性聚氨酯的氧化能力。氧化性气体 HF、CF_x，在氟代醇分解过程中释放的与氧化铝壳反应，释放内部活性铝，提高铝的活性。该研究可能为在复合固体推进剂和铸造炸药中使用高性能聚合物粘合剂提供新思路。

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Oxidizability Enhancement of Hydroxyl Terminated Polyether Polyurethane Elastomers via Fluoroalcohols Grafting

A series of fluoroalcohol grafted hydroxyl-terminated polyether (HTPE) polyurethanes (PU) elastomers were synthesized by a two-step method. The reaction progress was investigated by chemical titration and Fourier transform infrared spectroscopy (FTIR). The glass transition temperature (Tg), mechanical properties, morphology, and thermal decomposition behavior were determined for the preliminary analysis of PUs; the oxidizability property was tested by the decomposition of PU/Al composites. The results of mechanical and morphology properties demonstrated that the mechanical strength of modified PU elastomers was effectively improved for microphase separation of the hard segment. The PU film with the optimized fluoroalcohol content shows excellent performance of 17.7 MPa (tensile strength) and 547 % (elongation at break) at room temperature. Analysis of the thermal behaviors suggests that the oxidation ability of the modified PU is enhanced by the strong electronegativity of fluorine. The oxidizing gas HF, CF_x, released during fluoroalcohol decomposition reacts with the alumina shell, releasing internal reactive Al, which improves the activity of the aluminum. This study might provide a new idea for utilizing high-performance polymer binders in composite solid propellants and casting explosives.

更新日期：2022-05-31

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