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Metal/Fluorocarbon Pyrolants: V. Theoretical Evaluation of the Combustion Performance of Metal/Fluorocarbon Pyrolants based on Strained Fluorocarbons
Author(s) -
Koch ErnstChristian
Publication year - 2004
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.200400029
Subject(s) - fluorocarbon , trifluoromethyl , chemistry , oxidizing agent , reactivity (psychology) , enthalpy , combustion , metal , fluorine , carbon fibers , computational chemistry , organic chemistry , thermodynamics , materials science , alkyl , composite material , medicine , alternative medicine , physics , pathology , composite number
Abstract The potential of strained fluorocarbons, which can act as oxidizers in metal‐based pyrolant systems, is investigated. The oxidizing performance of fluorocarbons is evaluated by the enthalpy of combustion Δ c H (298K) and the fractional electron transfer Δ N. Δ c H (298K) can be related to hybridisation, molar C/F ratio and strain of the parent carbon skeleton of the fluorocarbon. Considered fluorocarbons are tetrafluorotetrahedrane (CF) 4 ( 3 ), tetrakis(trifluoromethyl)tetrahedrane C 4 (CF 3 ) 4 ( 4 ), hexafluoro[3]prismane (CF) 6 ( 5 ), hexakis(trifluoromethyl)[3]prismane C 6 (CF 3 ) 6 ( 6 ), octafluorocubane (CF) 8 ( 7 ), octakis(trifluoromethyl)cubane C 8 (CF 3 ) 8 ( 8 ), eicosafluorododecahedrane (CF) 20 ( 9 ), eicosakis(trifluoromethyl)dodecahedrane C 20 (CF 3 ) 20 ( 10 ), C 60 F 48 ( 11 ) and perfluorofullerane (CF) 60 ( 12 ). Powerful oxidisers in terms of exothermicity are those possessing both tertiary CF‐units and strained carbon skeletons. Nevertheless the reactivity, which is estimated on basis of ΔN , the fraction of electrons transferred according to Pearson, has been found to be high with the corresponding perfluoromethyl derivatives and maximum with the fluorofulleranes. For part IV see Ref. 17.