Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Pyrolysis of high-energetic diacetylenes

 
: Löbbecke, S.; Pfeil, A.; Meijere, A. de

Eckl, W. ; Fraunhofer-Institut für Chemische Technologie -ICT-, Pfinztal:
Combustion and detonation
Pfinztal: ICT, 1997 (Proceedings of the International Annual Conference of ICT 28)
ISSN: 0722-4087
S.111.1-111.11
Fraunhofer-Institut für Chemische Technologie (Internationale Jahrestagung) <28, 1997, Karlsruhe>
Fraunhofer-Institut für Chemische Technologie (International Annual Conference) <28, 1997, Karlsruhe>
Englisch
Konferenzbeitrag
Fraunhofer ICT ()

Abstract
First results of the thermal decompn. of 4 different spirocyclopropanated macrocyclic oligodiacetylenes ([n]rotanes) are described. The thermal behavior of the samples was characterized by modulated differential scanning calorimetry (M)DSC. The gaseous decompn. products were investigated by evolved gas anal. (EGA) in heatable optical cells. The decompn. gases were detected online during the sample heating by rapid scan FTIR spectroscopy. All expts. were performed under Ar atm. using linear heating rates between 2-5 K/min. at 20-300.degree.. The molar heat of decompn. increased dramatically when the no. of diethynylcyclopropane segments is enhanced from 5 to 6. Two addnl. segments led to a redn. of the molar heat of decompn. by approx. 25% ([8]rotane ). The thermal decompn. of all [n]rotanes are extreme exothermic reactions compared with those of conventional energetic materials. The permethylated [6]rotane is more stable than the non-methylated one. The thermal decompn. is significantl y shifted to higher temps. and the molar heat of decompn. is decreased by approx. 40% due to the stabilization of the cyclopropyl groups. Decompn. products detected by FTIR are CH4, C2H4, and C2H2.

: http://publica.fraunhofer.de/dokumente/PX-30284.html