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Thermochemistry of Evaporation and Sublimation of 2,4,6‐Triazido‐1,3,5‐triazine
Author(s) -
Korsunskiy Boris L.,
Nedel'ko Vadim V.,
Zakharov Viktor V.,
Chukanov Nikita V.,
Chervonnyi Alexandr D.,
Larikova Tatiana S.,
Chapyshev Sergey V.
Publication year - 2017
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.201600259
Subject(s) - cyanuric acid , sublimation (psychology) , vapor pressure , enthalpy of sublimation , enthalpy , chemistry , thermochemistry , analytical chemistry (journal) , thermodynamics , enthalpy of vaporization , heat capacity , volatility (finance) , melamine , chromatography , organic chemistry , psychology , physics , financial economics , economics , psychotherapist
Saturated vapor pressure over cyanuric triazide melt was measured in the temperature range 393.15–453.15 K using glass membrane Bourdon pressure gauges. Measured evaporation heat and evaporation entropy are equal to 61.1±3.3 kJ mol –1 and 111.3±6.1 J mol –1 K –1 , respectively. According to DSC data, melting heat and melting entropy of cyanuric triazide are 22.2±1.3 kJ mol –1 and 60.5±3.5 J mol –1 K –1 , respectively. Based on the results obtained, the following dependence was found for the saturated vapor pressure over solid cyanuric triazide: P s [Pa]=10 14.0 ⋅ exp[(–83300±3300)/ RT ]. Concequently, sublimation heat and sublimation entropy of cyanuric triazide are equal to 83.3±3.3 kJ mol –1 and 171.8±9.6 J mol –1 K –1 , respectively. Saturated vapor pressure over solid cyanuric triazide at room temperature is equal to 0.25 Pa (1.9×10 −3 Torr). It is concluded that high volatility of cyanuric triazide is caused by its low sublimation heat.