Nano crystals of γ-Fe 2 O 3 (maghemite) were synthesized by emulsion precipitation method using kerosene as oil phase, SPAN-80 (sorbitane monooleate) as the surfactant and sodium hydroxide as the precipitating agent. The characterization of the samples by FTIR (Fourier transform infra-red) and XRD (X-ray diffraction) techniques confirmed the formation of γ-Fe 2 O 3 (maghemite). Analysis by SEM (scanning electron microscope) and TEM (transmission electron microscope) was carried out to study the morphology and particle size. The as prepared samples contained inverse spinel cubic phase maghemite. Effect of initial iron concentration on crystallite size of maghemite showed that it decreased with the decrease in initial iron concentration. Transformation of γ-Fe 2 O 3 to α-Fe 2 O 3 (hematite) was studied by calcining the precursor in the temperature range of 500 to 850°C. Formation/transformation of phases at different temperatures was confirmed by FTIR and XRD studies. Images, obtained by SEM and TEM showed the morphology and nanocrystal formation of hematite. Room temperature rheological behaviour of the synthesized α-Fe 2 O 3 nano powder has been studied.
Bis-azido methyl oxetane (BAMO) was synthesised from pentaerythritol in two steps. Pentaerythritol was chlorinated to yield a mixture of mono, di, tri and tetra chloro compounds. The trichloro compound on ring closure gives bis-chloro methyl oxetane (BCMO). It was reacted with sodium azide in aqueous medium to obtain BAMO. The latter was polymerised using BF, etherate catalyst and 1,4-butanediol initiator. Similarly, the BAMO-THF copolymer was also synthesised. All the monomers and polymers were characterised by IR, 'H-NMR, "C-NMR, and refractive index. The polymers were also characterised for molecular weight, hydroxyl value, etc. Thermal analysis showed that both polymers degrade exothermically with T , , of 237 "C for polyBAMO and 241°C for BAMO-THF copolymer with activation energy of 39 kcallmol and 40 kcallmol, respectively. Explosive properties like impact and friction sensitivity of BAMO and the other polymers were also determined.
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