Understanding the alkyl effect of geminal dinitropropyl ester energetic plasticizers on hydroxyl terminated polybutadiene (HTPB): Simultaneous tuning on low temperature behavior and processability

doi:10.1016/j.cjche.2022.05.024

Abstract

Abstract: Geminal dinitropropyl ester plasticizers (DNPEPs) possess excellent energetic performances which provide good potentials as insensitive plasticizer. In this study, we design and synthesize DNPEPs with different alkane chain parts, and systematically investigate their structure–property relationships. Results show that DNPEPs have impact sensitivities all higher than 25.2 J, thermal decomposition temperatures all higher than 254 ℃, and glass transition temperatures (T_g) lower than -90 ℃. Furthermore, the effects of DNPEPs as plasticizer are studied on hydroxyl terminated polybutadiene (HTPB) in detail, including the viscosity, glass transition temperatures and others. It is noteworthy that 2,2-dinitropropyl nonanoate (DNPNc) among these DNPEPs exhibits the most expected simultaneous tuning effects on both viscosity and T_g of HTPB systems, providing favorable potentials to replace the conventional plastizers as dioctyl sebacate (DOS) in the HTPB based propellants and explosives.

Key words: Molecular simulation, Experimental validation, Preparation, Energetic plasticizer, Glass transition temperature, Viscosity

摘要： Geminal dinitropropyl ester plasticizers (DNPEPs) possess excellent energetic performances which provide good potentials as insensitive plasticizer. In this study, we design and synthesize DNPEPs with different alkane chain parts, and systematically investigate their structure–property relationships. Results show that DNPEPs have impact sensitivities all higher than 25.2 J, thermal decomposition temperatures all higher than 254 ℃, and glass transition temperatures (T_g) lower than -90 ℃. Furthermore, the effects of DNPEPs as plasticizer are studied on hydroxyl terminated polybutadiene (HTPB) in detail, including the viscosity, glass transition temperatures and others. It is noteworthy that 2,2-dinitropropyl nonanoate (DNPNc) among these DNPEPs exhibits the most expected simultaneous tuning effects on both viscosity and T_g of HTPB systems, providing favorable potentials to replace the conventional plastizers as dioctyl sebacate (DOS) in the HTPB based propellants and explosives.

关键词: Molecular simulation, Experimental validation, Preparation, Energetic plasticizer, Glass transition temperature, Viscosity

Baodong Zhao, Yinglei Wang, Fulei Gao, Yajing Liu, Weixiao Liu, Feng Ding. Understanding the alkyl effect of geminal dinitropropyl ester energetic plasticizers on hydroxyl terminated polybutadiene (HTPB): Simultaneous tuning on low temperature behavior and processability[J]. Chinese Journal of Chemical Engineering, 2023, 54(2): 364-371.

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