THE RESEARCH OF THE VARIATION OF THE CROSSLINKING DENSITY OF HTPB PROPELLANT UNDER ACCELERATED AGING BY NUCLEAR MAGNETIC RESONANCE

摘要

The cross-link density of HTPB (hydroxyl-terminated polybutadiene) was determined by the new method of low field nuclear magnetic resonance, and the influence of other components in the propellant were investigated. The results show that small molecule additive in the propellant have different effect on the cross-link density. In the initial stage of the thermal accelerated aging text, the cross-link density was increased with time.