Mechanical properties of the binder for GAP based cross-linked modified double-base propellant

The GAP prepolymer with isocyanate cross-linking was introduced to the binder system for double-base propellant. The effects of various curing agents type, R value, the content of curing catalyst (T ₁₂) and plasticizing ratio on the RNB value of crosslinking network parameters for binder system and mechanical properties of the binder for GAP based cross-linked modified double-base propellant were studied. Experimental results showed that RNB value increases with the increase of the R value and the content of (T ₁₂). In the cross-linking reaction of curing agents with -OH contained in NC, TDI was more active than IPDI. The maximum tensile strength and elongation of elastomer GAP-TDI/NC/NG were up to 1.09MPa and 202.12%, respectively, and the minimum T _g was -42.66°C.