A new class of first generation azido‐terminated dendritic esters have been synthesized by four step processes. The final products and the intermediates are characterized by IR, 1H NMR, and elemental analysis. Thermal studies revealed that these dendritic esters were thermally stable up to ∼190 °C and the glass transition temperature was found to be −54 and −32 °C, respectively.
Two new energetic azido esters named 1,3‐bis(azidoacetoxy)‐2 ‐azidoacetoxymethyl‐2‐ethylpropane (I) and 1,3‐bis(azidoacetoxy)‐2,2‐bis(azidomethyl)propane (II), have been synthesized and characterized by IR, NMR and Elemental Analysis. Thermal studies revealed that azido esters I and II are stable up to 180 °C and their glass transition temperatures are −47 °C and −52 °C, respectively.
A copolymer consisting of bis(azidomethyl) oxetane and hydroxyl-terminated polybutadiene was synthesized with different monomer ratios via an activated monomer mechanism. The copolymer thus obtained was characterized with Fourier transform infrared, 1 H-NMR, molecular weight, and polydispersity measurements. Rheological and thermal studies were also carried out. The mechanical properties of the gum stock obtained through curing with toluene diisocyanate and crosslinking with pyrogallol at about 508C were also determined. This was an attempt to combine the useful properties of hydroxylterminated polybutadiene (a nonenergetic binder providing excellent mechanical properties) and poly[bis(azidomethyl) oxetane] (an energetic binder).
Guanylurea dinitramide (GUDN), a stable salt of dinitramidic acid has good thermal stability and is a potential candidate for insensitive munitions. The synthesis process involves nitration of the ammonium salt of sulfamic acid with conc. HNO3/H2SO4 at −20 °C to −50 °C and further treatment with an aqueous suspension of guanylurea sulfate to obtain GUDN as white crystalline solid in 50 % yield. In order to optimize the process parameters to get the product in higher yield and greater purity, a systematic study with variation of different parameters like molar ratio of nitrating mixture, conditioning time, and temperature was carried out.
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