HOT SPOT GENERATION IN ENERGETIC MATERIALS BY APPLYING WEAK ENERGIES

Hot spot generation in energetic materials is an important process to initiate the exothermic chemical reaction, but the details of the fundamental science behind this process is still less-known. Although the response of energetic materials to low velocity impact have been heavily studied with high speed imaging, the response to the IR and acoustic is still not known. A high-speed thermal imaging microscopy apparatus was constructed to observe hot spot generation by weak energies ($\sim $30 T H z o p t i c a l f r e q u e n c y o r 20 k H z a c o u s t i c f r e q u e n c y), t o d e v e l o p t h e f u n d a m e n t a l s c i e n c e n e e d e d t o u n d e r s t a n d e n e r g y c o n c e n t r a t i o n m e c h a n i s m s l e a d i n g t o h o t s p o t g e n e r a t i o n . I n h o m o g e n e o u s c r y s t a l s w i t h d e f e c t s a n d p o l y m e r b i n d e r s w e r e u s e d i n t h e e x p e r i m e n t s, w i t h w e a k e n e r g i e s i t i s p o s s i b l e t o d e t e c t t h e h o t s p o t g e n e r a t i o n w i t h o u t d e s t r u c t i o n a n d d e f l a g r a t i o n − t o − d e t o n a t i o n t r a n s i t i o n s . W e h a v e s u c c e s s f u l l y r e c o r d e d t h e h o t s p o t g r o w n i n t h e 1,3,5− t r i n i t r o p e r h y d r o −1,3,5− t r i a z i n e (R D X) c r y s t a l a n d p o l y m e r − b o n d e d s u g a r s i m u l a n t b y a p p l y i n g F a r − I R r a d i a t i o n ($ \sim$30~THz) and acoustic sonication (20~kHz) respectively, and proceeded preliminary analysis to investigate the mechanism.

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Author Institution: School of Chemical Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801

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http://hdl.handle.net/1811/55357

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Abstracts of OSU International Symposium on Molecular Spectroscopy 2010-2013

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