Abstract Glycidyl azide polymer (GAP) is well known as an energetic prepolymer, but its application as a binder in propellants is limited due to its relatively high glass transition temperature and relatively poor mechanical properties. Copolymerization of GAP with polypropylene glycol (PPG) has been shown to improve GAPs properties because of the good thermal and mechanical properties of PPG. In this research we synthesized triblock copolymer of PPG-GAP-PPG and the compatibilities of this copolymer were investigated with energetic plasticizers (20% w/w) n-butyl nitroxyethylnitramine (BuNENA), trimethylolethane trinitrate (TMETN), and butanetriol trinitrate (BTTN) by solubility parameter, differential scanning calorimetry (DSC), rheological analysis, scanning electron microscopy (SEM) and vacuum stability test (VST). The DSC results showed that BuNENA had better compatibility with the triblock copolymer in comparison to TMETN and BTTN. It reduced the T g of PPG-GAP-PPG from −58 to −63 °C. The rheological analysis was in good agreement with the DSC results obtained for the compatibility of the plasticizers. In the case of the addition of 20% w/w BuNENA, the viscosity of copolymer/plasticizer decreased from 550 to 128 mPa s, indicating appropriate compatibility of plasticizer with the copolymer. SEM images showed a better distribution of BuNENA in the copolymer matrix.

中文翻译：

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含能增塑剂与聚丙二醇-缩水甘油叠氮化物聚合物-聚丙二醇三嵌段共聚物 (PPG-GAP-PPG) 的相容性

摘要 缩水甘油基叠氮化物聚合物（GAP）是一种众所周知的含能预聚物，但由于其较高的玻璃化转变温度和较差的机械性能，其在推进剂中的应用受到限制。由于 PPG 良好的热性能和机械性能，GAP 与聚丙二醇 (PPG) 的共聚已被证明可以改善 GAP 的性能。在这项研究中，我们合成了 PPG-GAP-PPG 的三嵌段共聚物，并研究了该共聚物与高能增塑剂 (20% w/w) 正丁基硝氧基乙基硝胺 (BuNENA)、三羟甲基乙烷三硝酸酯 (TMETN) 和三硝酸丁三醇 (BTTN) 的相容性) 通过溶解度参数、差示扫描量热法 (DSC)、流变分析、扫描电子显微镜 (SEM) 和真空稳定性测试 (VST)。DSC 结果表明，与 TMETN 和 BTTN 相比，BuNENA 与三嵌段共聚物的相容性更好。它将 PPG-GAP-PPG 的 T g 从 -58 °C 降低到 -63 °C。流变学分析与为增塑剂的相容性获得的 DSC 结果非常一致。在加入 20% w/w BuNENA 的情况下，共聚物/增塑剂的粘度从 550 mPa s 下降到 128 mPa s，表明增塑剂与共聚物的相容性合适。SEM 图像显示，BuNENA 在共聚物基质中的分布更好。在加入 20% w/w BuNENA 的情况下，共聚物/增塑剂的粘度从 550 mPa s 下降到 128 mPa s，表明增塑剂与共聚物的相容性合适。SEM 图像显示，BuNENA 在共聚物基质中的分布更好。在加入 20% w/w BuNENA 的情况下，共聚物/增塑剂的粘度从 550 mPa s 下降到 128 mPa s，表明增塑剂与共聚物的相容性合适。SEM 图像显示，BuNENA 在共聚物基质中的分布更好。