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Effect of Plasticizer on Mechanical and Thermal Properties of In Situ-Prepared Block Hydroxyl-Terminated Polyether Applied in Propellants

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Abstract

The relationship between the mechanical properties of in situ-prepared hydroxyl-terminated polyether (HTPE)/N-butyl-N-(2-nitroxyethyl)nitramine (Bu-NENA) binders and the plasticization ratio (pl/po), ranging from 0.4 to 1.2, was studied. The thermal properties and the very early stage of evaporation of Bu-NENA from an HTPE/Bu-NENA binder with a pl/po of 1.0 were also investigated. The results revealed that the pl/po ratio has a strong influence on the mechanical properties. When the pl/po ratio was 1.0, the mechanical properties of the in situ-prepared HTPE/Bu-NENA binder were satisfactory. The results showed that the Tg values of the in situ-prepared and traditional HTPE/Bu-NENA binder decreased as the plasticization ratio increased, and finally stabilized at approximately −75 and −78°C, respectively; moreover, the degree of phase mixing of the two soft segments of the in situ-prepared HTPE/Bu-NENA binder was greater than that of the traditional HTPE/Bu-NENA binder. The activation energy of the Bu-NENA evaporation from the in situ-prepared HTPE/Bu-NENA binder was close to that for the traditional HTPE/Bu-NENA binder, but the pre-exponential factor differed by an order of magnitude. Compared with the traditional HTPE propellant, the mechanical properties of the in situ-prepared HTPE propellant were greatly improved.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing Institute of Technology, 100081, Beijing, China

    Keke Chen, Chao Sang, Xiaomu Wen, Siping Pang & Yunjun Luo

  2. Key Laboratory for Ministry of Education of High Energy Density Materials, 100081, Beijing, China

    Keke Chen, Chao Sang, Xiaomu Wen, Siping Pang & Yunjun Luo

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  1. Keke Chen
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  2. Chao Sang
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  3. Xiaomu Wen
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Correspondence to Yunjun Luo.

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Keke Chen, Sang, C., Wen, X. et al. Effect of Plasticizer on Mechanical and Thermal Properties of In Situ-Prepared Block Hydroxyl-Terminated Polyether Applied in Propellants. Polym. Sci. Ser. A 63, 238–251 (2021). https://doi.org/10.1134/S0965545X21030020

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  • DOI: https://doi.org/10.1134/S0965545X21030020

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