Thermal Degradation of the Binder in GAP‐Based Propellants

Perreault, François; Benchabane, Mahmed

doi:10.1002/prep.19970220402

Cited by 2 publications

(1 citation statement)

References 1 publication

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“…The reaction zone length was estimated as 5.4 mm which was shorter than that in a PMMA tube with lower detonation velocity. Furthermore, as pointed out, Wood-Kirkwood equation cannot be simply applied to the non-ideal detonation behaviour [11,12], another concept of the geometry of the reaction zone including the shock front curvature and the reaction zone length should be a further investigation.…”

Section: Resultsmentioning

confidence: 99%

Experimental Determination of the Detonation Front Curvature of Non-Ideal Explosive ANFO

Miyake

Ohtagaki²,

Abe

et al. 2004

MSF

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In order to obtain a better understanding of the non-ideal detonation behaviour of ammonium nitrate and fuel oil mixture explosive (ANFO), shock front curvature of stable detonation of ANFO was determined in steel and PMMA tubes. ANFO was initiated by a plane shock wave from a plane wave lens made by two kinds of liquid explosive, and the shock front trace was recorded with the streak camera. Based on the experimental results the radius of the shock front curvature of detonating ANFO with the detonation velocity of 1.7 km/s in a PMMA tube with the diameter of 40 mm was determined as 36 mm. While the radius of the shock front curvature in a steel tube with the diameter of 36 mm was determined as 55 mm with the detonation velocity of 3.1 km/s. The reaction zone length of detonating ANFO was estimated as 6.3 mm in a PMMA tube and 5.4 mm in a steel tube with Wood-Kirkwood equation. It was found that the confinement of ANFO had a strong influence on the detonation velocity and the detonation front curvature.

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Section: Resultsmentioning

confidence: 99%

Experimental Determination of the Detonation Front Curvature of Non-Ideal Explosive ANFO

Miyake

Ohtagaki²,

Abe

et al. 2004

MSF

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Monitoring the Aging Dynamics of Glycidyl Azide Polyurethane by NMR Relaxation Times

1999

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We have used solid-state NMR to monitor the aging dynamics of a polyurethane based on glycidyl azide polymer (GAP) used as a binder in solid rocket propellants. We have shown by deuterium NMR longitudinal relaxation time (T 1) measurements that it is possible to monitor the degradation of the binder as a function of time for samples with different NCO/OH ratios. The longitudinal relaxation was found to be nonexponential. Thus, we have used a stretched exponential equation of the type Kohlrausch−Williams−Watts to determine the value of T 1ww. With the help of the gamma function, the average value of T 1 (〈T 1〉) was determined without knowing the shape of its distribution function. Since the solid-state NMR method has the advantage of being nondestructive, we were able to monitor the aging of the polyurethane samples that were kept in ambient conditions rather than in the extreme thermal conditions usually applied in aging studies of polymers.

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Thermal Degradation of the Binder in GAP‐Based Propellants

Cited by 2 publications

References 1 publication

Experimental Determination of the Detonation Front Curvature of Non-Ideal Explosive ANFO

Experimental Determination of the Detonation Front Curvature of Non-Ideal Explosive ANFO

Monitoring the Aging Dynamics of Glycidyl Azide Polyurethane by NMR Relaxation Times

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