Characterization of a Slurry Process Used to Make a Plastic-Bonded Explosive

Kasprzyk, David J.; Bell, David A.; Flesner, R.L.; Larson, S.A.

doi:10.1002/(sici)1521-4087(199912)24:6<333::aid-prep333>3.0.co;2-t

Cited by 22 publications

(9 citation statements)

References 3 publications

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“…These plastic‐bonded explosives are prepared by precipitation of a water‐saturated solution of Estane 5703p in methylethyl ketone (MEK) onto an HMX/water slurry in a Holston reactor 14. When the solvent is removed, the resulting “molding powder” consists of spherical aggregates of HMX explosive crystals coated with polymer 15. This “molding powder” is dried, isostatically pressed into billets at 105°C and 140 MPa (20 Ksi) for LX‐14 and somewhat lower temperature for PBX‐9501, cooled to ambient and machined into device parts.…”

Section: Introductionmentioning

confidence: 99%

Dynamic mechanical signatures of a polyester‐urethane and plastic‐bonded explosives based on this polymer

Hoffman

2001

J of Applied Polymer Sci

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ABSTRACT:The complex shear moduli of the segmented polyurethane Estane 5703p, Livermore explosive (LX)-14, and plastic bonded explosive (PBX)-9501, which use this polymer as a binder, have been investigated. Segmented polyurethanes, such as Estane 5703, contain microphase-separated hard segments in a rubbery matrix of soft segments. LX-14 is composed of 95.5% 1,3,5,7-tetranitroazacyclooctane (HMX) explosive with 4.5% Estane 5703 binder. PBX-9501 is composed of 94.9% HMX, 2.5% Estane 5703p binder, 2.5% nitroplasticizer (NP), and about 0.1% antioxidant Irganox 1010. In the temperature range from Ϫ150 to 120°C, two relaxations were observed as peaks in the loss modulus and tangent delta in Estane 5703p and LX-14. A third relaxation was found in PBX-9501. The low temperature relaxation associated with vitrification of the poly(ester urethane) soft segment occurred in the shear loss modulus (GЉ) at Ϫ29 and Ϫ26°C in Estane and LX-14, respectively, at 1 Hz. In PBX-9501 the Estane soft segment glass transition peak, T g (SS), in the loss modulus occurred at Ϫ40 Ϯ 3°C at 1 Hz. The reduction in soft segment glass transition in PBX-9501 is clear evidence of plasticization of the soft segment by NP. The apparent activation energy of the maximum in the loss modulus for LX-14 and PBX-9501 over the frequency range from 0.1 to 10 Hz was 230 kJ/mole (55 kcal/mole). The hard segment glass transition, T g (HS), was observed as a peak in the loss modulus at about 70°C. In LX-14 the transition was observed at lower temperatures (56 -58°C at 1 Hz) depending on thermal history. There was a low temperature shoulder on the T g (HS) of Estane 5703 associated with soft segment crystallinity. Modulated differential scanning calorimetry (MDSC) was used to verify the T g (HS) in Estane and 50/50 mixtures of Estane with NP. In PBX-9501 the hard segment glass transition occurred between 65 and 72°C. The presence of NP in PBX-9501 gave rise to a new transition, T eu (NP), between 8 and 15°C. This peak is believed to be associated with the eutectic melting of the plasticizer. Returns of fielded PBX-9501 that were 6 and 11 years old were also measured. Small variations in T g (SS) and the rubber plateau modulus were observed in these aged samples, consistent with migration of plasticizer and/or very low levels of chain scission.

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Section: Introductionmentioning

confidence: 99%

Dynamic mechanical signatures of a polyester‐urethane and plastic‐bonded explosives based on this polymer

Hoffman

2001

J of Applied Polymer Sci

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“…temperature, and then the explosive material is blended with polymer 8 . The water dispersion method is used to develop formulations with low polymer content.…”

Section: Impact Sensitivity Of Rdx and Viton Compositions Prepared Bymentioning

confidence: 99%

Impact Sensitivity of RDX and Viton Compositions Prepared by Co-precipitation Method

Wagh

Ingale

Kumar

et al. 2015

DSJ

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Desensitisation of explosive materials using polymers is an important area in safe utilisation of explosives in various applications. The RDX/viton composition has been developed using co-precipitation method with varying content of viton, ranging from 5 to 35 wt per cent. RDX and viton were dissolved in acetone which is a common solvent for RDX and viton, and then the acetone was extracted from the solution by distillation resulting in homogeneous RDX/viton composition. Infrared spectroscopy studies indicated presence of RDX and viton in the resulting compositions. Thermogravimetric and differential thermal analysis studies made on yielded compositions confirmed that RDX is present in the composition in desired content. The shift in exotherm of RDX/viton composition as compared to RDX showed that polymer-bonded RDX compositions are more stable. The impact sensitivity studies showed that sensitivity of RDX/viton composition decreased with increasing content of viton. The similar trend was observed for friction sensitivity. The co-precipitation method has been found to be advantages to obtain homogeneous composition of RDX and viton (with viton content up to 25 wt per cent) as revealed by linear trend in sensitivity data measurements. It has been demonstrated that the sensitivity of RDX can be tailored within a wide range using viton so as to suit in desired applications.Defence Science Journal, Vol. 65, No. 4, July 2015, pp. 287-291, DOI: http://dx.doi.org/10.14429/dsj.65.8647

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“…The preparation was carried out using the slurry technique (17)(18). PI was completely dissolved in DCE and RDX was slowly added to the laquer.…”

Section: Preparation Of Pbx Beads Based On Rdx and Pimentioning

confidence: 99%

Preparation and Characterization of Thin Sheets of Energetic Materials Based on Polyisoprene

Radwan

Mostafa

Elsharkawy

2006

The International Conference on Chemical and Environmental Engi

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Thin sheets of highly energetic materials based on polyisoprene (PI) as high elastomeric material and cyclo-trimethylene trinitamine (RDX) as high brisant explosive were prepared by rolling of the prepared beads of the RDX coated by PI. These beads were prepared by employing the slurry technique and the sheet explosives were cured in oven at 60 o C for two days. The measured explosive properties of the prepared sheets were discussed and compared with that based on RDX and polyisobutylene (PIB). The sensitivity to impact and friction of the prepared formulation containing 86% RDX were markedly decreased when compared with that of pure RDX, but the ignition point was close to that of pure RDX. The measured detonation velocity of the prepared formulation (8100 m/s) was slightly less than that of pure RDX. The prepared sheet explosive, after curing, behaves as an elastomer with very good stress-strain values.

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Characterization of a Slurry Process Used to Make a Plastic-Bonded Explosive

Cited by 22 publications

References 3 publications

Dynamic mechanical signatures of a polyester‐urethane and plastic‐bonded explosives based on this polymer

Dynamic mechanical signatures of a polyester‐urethane and plastic‐bonded explosives based on this polymer

Impact Sensitivity of RDX and Viton Compositions Prepared by Co-precipitation Method

Preparation and Characterization of Thin Sheets of Energetic Materials Based on Polyisoprene

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