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A number of different quench media were evaluated in order to improve the characteristics of 2,6‐diamino‐3,5‐dinitropyrazine‐1‐oxide (LLM‐105) obtained via nitration of 2,6‐diaminopyrazine‐1‐oxide (DAPO). After a first screening phase, seven aqueous solutions containing a selected additive were used to quench the nitrating mixture in scale‐up experiments. Complete characterization of the resulting LLM‐105 indicated that nitrate salts as additives, especially ammonium and potassium nitrate, provided a high quality product, without requiring any further recrystallization. Notably, both particle morphology and thermal stability were significantly improved over the ones obtained using the standard pure water quench. This new DAPO‐LLM‐105 has been compared to the conventional DMP‐LLM‐105 and showed similar characteristics with even better insensitivity data.

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In order to response for security purposes, many developments have been developed for counter terrorism and/or military applications. Chemical sensors are promising sensors for trace detection because of their sensitivity and selectivity. Fluorescent sensors have already demonstrated their ability for explosives compounds. In this paper, a polycarbosilane functionalised with pyrene (PCS-Py), a new fluorescent material was tested for explosives detection. Several aspects and characteristic of polymer film were studied: in particular the microstructure of the film and its stability under air flow. Relationship between microstructures and performances were investigated depending of coating methods. Experiments were lead to demonstrate that photo bleaching phenomenon is the main contributing factor in the reduction of stability under air flow.

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