Properties of Kel F-800 polymer

Cady, W.E.; Caley, L.E.

doi:10.2172/5305005

Cited by 25 publications

(24 citation statements)

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“…Of historical note is that production of Kel-F 800 was paused from 2002-2007 and resumed using a different process that avoided the use of perfluorinated surfactant. Consequently, the new production material studied here has fewer impurities (undetectable vs. 2% in old production material) and a smaller granule size than the original material often reported in the literature [24]. In addition, new production Kel-F 800 has only a single melt endotherm at 110°C, compared with two endotherms ($84, 110°C) observed in many of the older production lots, which may be indicative of more ordered crystalline structures.…”

Section: Fluoropolymersmentioning

confidence: 69%

Adhesive properties of some fluoropolymer binders with the insensitive explosive 1,3,5-triamino-2,4,6-trinitrobenzene (TATB)

Yeager

Dattelbaum

Orler

et al. 2010

Journal of Colloid and Interface Science

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Section: Fluoropolymersmentioning

confidence: 69%

Adhesive properties of some fluoropolymer binders with the insensitive explosive 1,3,5-triamino-2,4,6-trinitrobenzene (TATB)

Yeager

Dattelbaum

Orler

et al. 2010

Journal of Colloid and Interface Science

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“…Kel F-800 has a glass transition (Tg) of 28°C [7]. Therefore, at temperatures above Tg, Kel F-800 is softer and below Tg, Kel F-800 is stiffer.…”

Section: Introductionmentioning

confidence: 99%

Thermal cycling and ratchet growth of as-pressed TATB pellets

Woznick

Thompson

DeLuca

et al. 2018

AIP Conference Proceedings

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Abstract. The explosive 1,3,5-triamino-2,4,6-trinitirobenzene (TATB) contains a unique crystal morphology that imparts a degree of texture to the compacted material. This is also true for TATB-containing plastic bonded explosives (PBXs), thus inducing anisotropy to the mechanical and thermal properties of these materials. The plate-like TATB crystals possess very anisotropic coefficient of thermal expansion (CTE) values, the through-plate direction being ~10 times greater than the other two directions. Although the mechanism is not well-understood, in solid compactions of TATB and TATB-based PBXs, the highly anisotropic CTE gives rise to an irreversible volume expansion that accompanies thermal cycling. This phenomenon, called "ratchet growth", is believed to arise from internal stresses induced by thermal expansion. For this study, TATB was die-pressed into cylindrical pellets. These pellets were thermally cycled to hot and cold temperatures within a thermal mechanical analyzer (TMA) to measure the ratchet growth response. The results were compared to the response of PBX 9502, measured in a previous study, to highlight the role of the Kel-F binder in the ratchet growth phenomenon. The comparison may be somewhat complicated by the effects of texture due to the difference in sample preparation (i.e. isostatically machined versus "as-pressed" parts). The detailed evaluation of porosity changes, before and after ratchet growth, is simplified in the absence of binder.

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“…Kel-F 800 undergoes a glass transition at approximately 30 °C and melts at approximately 95 °C, both transition temperatures vary slightly by sample. 17 Each transition increases the mobility of the polymer, potentially creating new pathways for water molecules to diffuse out of the material. These phase transitions could be partially responsible for the two-stage kinetics of water outgassing observed in Figure 1.…”

Section: Figurementioning

confidence: 99%

“…[17][18][19] The heterogeneous nature of TATB/Kel-F 800 formulations cause the thermal expansion of the constituent materials to expose new surfaces via cracks and voids in the material. 20 These new surfaces may have water molecules embedded in them and the newly formed cracks and voids facilitate water transport through the material.…”

Section: Figurementioning

confidence: 99%

Moisture Desorption Rates from TATB Formulations: Experiments and Kinetic Models

et al. 2012

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The rate of water desorption from PBX-9502, a formulation containing 1,3,5-triamino-2,4,6-trinitrobenzene (TATB), is measured using temperature-programmed desorption and modeled using conventional kinetic modeling methods. The results of these studies show two stages of moisture release. At lower temperatures, the release is likely assisted by thermal expansion of the TATB and melting of the Kel-F binder. At higher temperatures, a considerable amount of water is released and is attributed to sublimation of the TATB, which exposes new surfaces for water desorption.

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Properties of Kel F-800 polymer

Cited by 25 publications

References 0 publications

Adhesive properties of some fluoropolymer binders with the insensitive explosive 1,3,5-triamino-2,4,6-trinitrobenzene (TATB)

Adhesive properties of some fluoropolymer binders with the insensitive explosive 1,3,5-triamino-2,4,6-trinitrobenzene (TATB)

Thermal cycling and ratchet growth of as-pressed TATB pellets

Moisture Desorption Rates from TATB Formulations: Experiments and Kinetic Models

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