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Composite Propellant Formulation of Poly (16-, 32- and 64-) Azido Dendritic Esters as Energetic Plasticizer and Evaluation of Properties

Yamajala Kanaka Durga Bhaskar, Singh Hema, Kurva Ramesh, Maurya Mehilal, Banerjee Shaibal

Central European Journal of Energetic Materials

2020

Vol. 17, no. 4

506--522

16-, 32- and 64-Polyazido hyperbranched dendrimers were synthesized from hydroxy terminated dendritic ester by following two steps namely, tosylation and azidation. The poly azido dendrimers were incorporated in composite propellant formulations as an energetic plasticizer. The physical, thermal sensitivity and ballistic properties of these composite propellants such as burning rate, Cal-val, density, ignition/decomposition temperature (AET), DSC-TGA, mechanical properties, impact and friction sensitivity were evaluated experimentally while the specific impulse (Isp) and characteristic velocity (C*) were obtained theoretically. A significant enhancement in heat release was noted in the propellant formulation having 16-azido dendritic ester as an energetic plasticizer compared to 32- and 64-azido dendritic esters and a reference composition.

Designing a Highly Energetic PCL-GAP-PCL-based PU Elastomer; Investigation of the Effect of Plasticizers on Its Properties

Chizari Mostafa, Bayat Yadollah

Central European Journal of Energetic Materials

2019

Vol. 16, no. 1

33--48

Glycidylazide polymer (GAP) has potential interest for the development of high-performance energetic propellants. Although GAP is a well-known and promising energetic polymer, propellants based on it suffer from poor mechanical and low-temperature properties. In order to improve the mechanical and thermal properties of GAP a promising idea would be the preparation of a tri-block copolymer of it with a polymer having good mechanical and thermal properties, such as polycaprolactone (PCL). In this work, we report a detailed investigation of the glass transition temperature (Tg) and viscosity of PCL-GAP-PCL samples incorporated with energetic plasticizers, BuNENA, TMETN, and BTTN. The results demonstrated that the Tg of PCL-GAP-PCL is influenced by the type of plasticizer. PCL-GAP-PCL was cured with TDI and a mixed curing system (IPDI/N100). The elastomer prepared with the mixing curing system showed excellent mechanical properties with 2.64 MPa and 138% elongation. The effects of the energetic plasticizers on the mechanical properties of the elastomer were investigated. Finally, the plasticized tri-block copolymer showed enhanced mechanical and thermal properties.

Stability Analysis of n-Butyl-nitratoethylnitramine (Bu-NENA)

Wilker S., Gjersoe R., Stenslands P., Becher Ch.

Central European Journal of Energetic Materials

2007

Vol. 4, nr 3

59-80

This article describes the thermal decomposition of n-Butyl-nitratoethylnitramine (Bu-NENA) which is a relatively new, not very widely used energetic plasticizer having attractive features. The decomposition reaction is a hydrolysis which leads to the formation of n-Butyl-ethanolnitramine (Bu-ENA) and nitric acid. stability of Bu-NENA can be measured by the Bu-ENA formation rate and by microcalorimetry. The stability of high quality material is good enough that a stabilizer is not necessarily needed. As the main reaction is forced by hydrolysis it is recommended that Bu-NENA is stored in dry conditions. Surprisingly DSC does not differentiate very well between stable and unstable samples. The main difference is found in the peak areas, not in the onset or peak maximum temperatures. decomposition product Bu-ENA is still an energetic material with an exothermic decomposition behaviour.