Kinetics of thermolysis of ring-substituted arylammonium nitrates 2. TG, DTA, impact, and friction sensitivity studies
✍ Scribed by Gurdip Singh; I.P.S. Kapoor; S.M. Mannan; J.P. Agrawal
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 938 KB
- Volume
- 97
- Category
- Article
- ISSN
- 0010-2180
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✦ Synopsis
Thermolysis of ring-substituted arylarnmonium nitrates (RSAN) has been carried out by TG, DTA, impact, and friction sensitivity measurements. Although the kinetics of thermal decomposition of these salts was evaluated by fitting TG data in nine mechanism-based kinetic models, the contracting envelopes (n = 2, 3) and Avrami-Erofeev (n = 2, 3) gave the best fit. The activation energies for decomposition (Ed), exothermic decomposition temperatures (T d) (from DTA curves), and impact sensitivity data are found to be linearly related to the Hammett substituent constant (o-) and dissociation exponent (pK a) of the corresponding arylamine. The mechanism of thermolysis of these salts has also been suggested, based on the formation of reaction intermediates during decomposition. A reaction scheme, accounting for the products, is proposed that involves proton transfer, leading to the formation of an arylamine and HNO 3 and oxidation of the arylamine by decomposition products of HNO 3. The oxidation-reduction reactions, near the surface of the thermolysing material (RSAN), are responsible for the decomposition.