Novel Composite Solid Propellant with High Resistance to Thermo-oxidative Degradation Reactions, Extended Shelf Life, and Superior Combustion Characteristics

• Autorzy: Elbasuney Sherif , Elsaka Eslam , Elbeih Ahmed , Mostafa Hosam E.

Identyfikatory

DOI

10.22211/cejem/135119

• Języki publikacji: EN

Abstrakty

EN

Hydroxy-terminated polybutadiene (HTPB) pre-polymer is the main constituent that is responsible for conferring high mechanical properties on composite solid propellants. However, HTPB pre-polymer suffers from oxidative degradation reactions that diminish its mechanical properties and shelf life. Composite solid propellant formulations based on an advanced stabilizing agent (anti-oxidant), Flexzone 6-H, with different curing ratios, 0.7 and 1.1, were developed via mixing and casting under vacuum. The developed formulations were subjected to artificial ageing using Vant Hoff,s formula by isothermal heating at 80 °C for up to 35 days. The change in strain with ageing was evaluated using a uni-axial tensile test. The propellant formulation based on a curing ratio of 0.7 demonstrated a high ageing resistance coefficient and an extended service life of up to 15 years, compared with 5 years for higher curing ratio. A propellant grain is considered to be ‘aged out’ at 30% reduction in its maximum strain value. The propellant formulation based on the 0.7 curing ratio exhibited superior thermal stability as it offered a minimum decrease in heat released after ageing using DSC. Additionally, the 0.7 curing ratio formulations exhibited a minimum change in burning rate and pressure exponent with ageing time. It can be concluded that the propellant with 0.7 curing ratio can maintain its mechanical, thermal, and ballistic properties with ageing.

Słowa kluczowe

EN

composite propellants; ageing; mechanical properties; curing ratio; combustion

• Czasopismo: Central European Journal of Energetic Materials
• Rocznik: 2021
• Tom: Vol. 18, no. 1
• Strony: 143--158
• Opis fizyczny: Bibliogr. 26 poz., rys., tab.

Twórcy

autor

Elbasuney Sherif

• School of Chemical Engineering, Military Technical College, Kobry Elkoba, Cairo, Egypt
• Head of Nanotechnology Research Center, Military Technical College, Cairo, Egypt

autor

Elsaka Eslam

• School of Chemical Engineering, Military Technical College, Kobry Elkoba, Cairo, Egypt

autor

Elbeih Ahmed

• School of Chemical Engineering, Military Technical College, Kobry Elkoba, Cairo, Egypt

autor

Mostafa Hosam E.

• School of Chemical Engineering, Military Technical College, Kobry Elkoba, Cairo, Egypt

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).