Noncrystalline Binder Based Composite Propellant

Table 3

Mechanical, rheological, and ballistic properties of propellant samples.

Composite propellants	Unit	Mix1			Mix2
Density, ρ	g cm^−3	1.88			1.83
Specific impulse (theoretical), 7/0.1 MPa	sec	266			270
Density specific impulse (ρ·I sp)	g·cm^−3 sec	500			494
Burning rate at 7 MPa	mm s^−1	8.50			7.00
Pressure exponent (𝑛), (2–18) MPa	—	0.45			0.40
Processability
End of mixing (EOM) viscosity	K Poise	4.0			4.5
Pot life (to 15 K poise)	hour	8			10
Mechanical Properties 𝑇 °C //50 mm min^−1	𝑇 °C	−40	25	50	−40	25	50
Max. tensile strength 𝜎max	N mm^−2	1.5	0.8	0.6	1.8	0.7	0.5
Elongation at 𝜀max	%	65	78	86	58	70	78
Elongation at break	%	70	86	91	63	76	81
E-modulus	N mm^−2	5.5	2.2	1.8	5.8	2.0	1.6
Glass transition DSC	°C	−75.03			−77.47