Using low-field nuclear magnetic resonance (NMR) technology to determine the reactivity sequence of the components containing active hydrogen in the propellant and the curing agent

Using low-field temperature-variable nuclear magnetic resonance (NMR) technology, the reactive activity sequence of several components containing active hydrogen in solid propellants—YS (stearic acid), RD (2,2,4-trimethyl-1,2-dihydroquinoline polymer), antioxidant H (N,N’-diphenyl-p-phenylenediamine), PB (α,α-dimethylbenzyl alcohol), and curing agent TDI (toluene diisocyanate)—was studied. The results show that the reaction activity sequence of these components with TDI is as follows: Antioxidant H > RD > YS > PB. This measurement method has been patented (Patent No.: ZL 2013 1 0200525.5).

1) The reaction activity sequence of TDI with the four components containing active hydrogen is: Antioxidant H > RD > YS > PB.

2) Low-field NMR is a fast and simple method for characterizing the reaction activity sequence of components.

Selected from Newmai’s case competition: Wei Hu, Hubei Aerospace Chemical Technology Research Institute, using low-field nuclear magnetic resonance to determine the reaction activity sequence of active hydrogen-containing components in propellants with curing agents.

Instrument used:
VTMR20-010V-I Nuclear Magnetic Resonance Crosslinking Density Imaging Analyzer