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UID:0-434@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20170604T163000

DTEND;TZID=Asia/Jerusalem:20170604T173000

DTSTAMP:20230530T181030Z

URL:https://aerospace.technion.ac.il/events/about-new-approaches-in-the-st
 udy-of-the-initiation-reactivity-of-nitramines/

SUMMARY:About New Approaches in the Study of the Initiation Reactivity of N
 itramines
DESCRIPTION:Lecturer:Prof. Svatopluk ZEMAN\n Faculty:Institute of Energetic
  Materials\, Faculty of Chemical Technology\n Institute:University of Pard
 ubice\, The Czech Republic\n Location:Meeting Hall 203\, 2nd floor\, Fine 
 Rocket Propulsion Center\, Aerospace Engineering\n Zoom: \n Abstract: \n D
 etails: \n Extemporary short intermolecular distances of nitro groups in t
 he crystal lattice of polyniro compounds led towards invocation of activit
 ies in the research of free spaces (free volumes\, DV) in crystals of EMs 
 and of their influence on impact sensitivity of the mentioned energetic co
 mpounds. The first published papers from this area have awoke our interest
  also in verification of the mentioned influence not only on impact\, fric
 tion and electric spark sensitivities\, and thermal reactivity\, but also 
 on crystal densities and performance\, which is demonstrated on 24 nitrami
 nes.\nThe relationships between sensitivity and the crystal lattice free s
 pace per molecule\, DV\, in the nitramine crystals are described by equati
 ons which are divided into a number of sub-relationships\, each of them wi
 th a strong limitation by the molecular-structural characteristics of such
  compounds. With exception of the impact sensitivity\, increasing DV value
 s leads mostly to decreasing of initiation reactivity of the nitramines st
 udied. In the case of impact sensitivity it is not possible to say uniquel
 y that increasing of the DV values leads to its increasing or decreasing\;
  this is differet from published opinion. Several little exceptions from t
 he mentioned trends have analogies in other relationships of sensitivity\,
  for example “spark energies - bond dissociation energies” or in the c
 ase of impact sensitivity in relation “impact sensitivity – volume hea
 t of explosion”.\nMore detailed analysis of a mutual dependence of volum
 e heat of explosion\, rQ\, on the crystal lattice free volume\, DV\, shows
  that their courses are relatively tight but they are not unequivocal. Par
 tial linear relationships for the rQ values mostly show increase of this c
 haracteristic with increasing the DV values\, but here also some opposite 
 trends exist.  A similar situation is in semilogarithmic relationship bet
 ween the crystal density\, r (important characteristics for detonation and
  performance)\, and the DV values of the nitramines studied\; here the stu
 died substances are as if divided into a group derived from dimethyl nitra
 mine and a group derived from 2\,4\,6\,8\,10\,12-hexanitro-2\,4\,6\,8\,10\
 ,12-hexaazaisowurtzitane (HNIW). All the analyzed dependencies confirm tha
 t in the non-ionic nitramines maximal density and detonation parameters ar
 e limited by values which are peculiar to e-HNIW.\nThe found relationships
  for the impact and friction sensitivities confirm the disorder in distrib
 ution of the forces in the crystal lattice of the “common” quality of 
  e-2\,4\,6\,8\,10\,12-hexanitro-2\,4\,6\,8\,10\,12-hexaaza-isowurtzitane 
 (CL-20)\, in comparison with its RS (reduced sensitivity) or chemically pu
 re analogue\; these relationships allow also to speculate\, which of the n
 itro groups in the CL-20 molecule might have a main participation in the i
 ntermolecular interactions for its particular kind.
CATEGORIES:Seminars
LOCATION:Meeting Hall 203\, 2nd floor\, Fine Rocket Propulsion Center\, Aer
 ospace Engineering

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DTSTART:20170324T030000

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