Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 3, Pages 1578-1582Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202008562
Keywords
azo compounds; depolymerization; energetic materials; nitrogen; polymers
Categories
Funding
- CNES
- ArianeGroup
- CNRS
- CPE Lyon
- Universite Claude Bernard Lyon1
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New energetic polymers based on polytetrazenes have direct incorporation of energetic groups in the polymer backbone, with decomposition temperature at around 130 degrees Celsius and glass transition temperatures ranging from -34.2 to 0.2 degrees Celsius, lowering to -61 degrees Celsius with a new diazidotetrazene plasticizer. Complete room-temperature depolymerization within 1 week is achieved using hexafluoroisopropanol (HFIP), enabling recycling of pyrotechnic compositions with these new binders.
New energetic polymers were synthesized from monomers containing a trans-2-tetrazene unit. In contrast to traditional binders, such as inert hydroxytelechelic polybutadiene or glycidyl azide polymers-in which the energetic features are on the side chains-the energetic groups in the polytetrazenes are incorporated directly in the polymer backbone. Thermal analyses demonstrated that decomposition occurs at approximately 130 degrees C, regardless of the polymer structure. Glass-transition temperatures ranged from -34.2 to 0.2 degrees C and could be lowered further (to -61 degrees C) with the help of a new diazidotetrazene energetic plasticizer. Interestingly, hexafluoroisopropanol (HFIP) enabled complete, room-temperature depolymerization within 1 week. This depolymerization should enable the recycling of unused pyrotechnic compositions based on these new binders.
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