US EPA

7470587 

Journal Article 

[Characterization of broken key weak point in network structure of GAP propellant plasticized by nitrate] 

Nie, H; An, B; Huang, Z; Bai, J; Liu, Z; Zhou, M 

2020 

1 

Guti Huojian Jishu / Journal of Solid Rocket Technology
ISSN: 1006-2793 

43 

3 

280-284 

Chinese 

10.7673/j.issn.1006-2793.2020.03.003 

The glycidylazide polyether(GAP) propellant plasticized by nitrates is one of the key development directions of solid propellant, and investigation on its network structure can provide theoretical basis and technical support for the development of propellant formulation. In order to find out the chemical composition change and the key point of bond breaking down of nitrates plasticized GAP propellant during the aging process, pure GAP propellant gels were prepared by Soxhlet extraction and acid dissolution. The chemical composition of the network structure and the weak points of bond breaking before and after the aging of the propellant were characterized by means of infrared spectrum, element analysis, thermogravimetry differential scanning calorimetry, thermogravimetry infrared and environmental scanning electron microscope. The results show that the chemical composition of the network structure of the propellant is azido polyether polyurethane. After aging, the amount of hydroxyl group in the network structure increases, the amount of azido group weakens, and the network structure changes from beige to red. The network chain is easy to be oxidized and broken, and the voids in the network become larger. The breaking position first occurs on the azido group, then on the carbamate bond and oxygen carbon bond of polymer main chain. 

aging properties; broken bond weak point; GAP propellant; network structure; nitrate