| || Synthesis and characterisation of bis azido methyl oxetane and its polymer and copolymer with tetrahydrofuran
Author : Nair, J.K. ;Satpute, R.S. ;Polke, B.G. ;Mukundan, T. ;Asthana, S.N. ;Singh, Haridwar
Source : Defence Science Journal ; Vol:52(2) ; 2002 ; pp 147-156
Subject : 623.4 Armaments and Ballistics;623 Military Science and Engineering
Keywords : Explosives ;Armament ;Copolymers ;Tetrahydrofuran
Abstract : "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 BF3 etherate catalyst and 1,4-butanediol initiator. Similarly, the BAMO- THF copolymer was also synthesised. All the monomers and polymers were characterised by IR, 1H-NMR, 13C-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 max of 237 °C for poly BAMO and 241°C for BAMO- THF copolymer with activation energy of 39 kcal/mol and 40 kcal/mol, respectively. Explosive properties like impact and friction sensitivity of BAMO and the other polymers were also determined. "
| || Synthesis and Characterisation of Bis-(chloromethyl) Oxetane, its Homopolymer and Copolymer with Tetrahydrofuran
Author : Reddy, T.S.;Jayakumar, K.K.;Nair, J.K.;Satpute, R.S.;Mukundan, T.
Source : Defence Science Journal ; Vol:56(3) ; 2006 ; pp 399-406
Subject : 662.3 Propellants;662.1 Pyrotechnics;620.261 Explosives
Keywords : Poly-BCMO;BCMO–THF copolymer;HTPB;Flame retardant;Limiting oxygen index;Filler;Tetrahydrofuran copolymer;Energetic binders;Propellant binders;Energetic polymers;Bis- (chloromethyl) oxetane;Thermoplastic elastomers
Abstract : Bis-(chloromethyl) oxetane (BCMO) was synthesised from pentaerythritol by chlorination, followed by ring closure. It was polymerised using BF3-etherate and butanediol system, similarly the BCMO–THF (tetrahydrofuran) copolymer was also synthesised. The monomers and the polymers were characterised by IR, 1H-NMR and molecular weight. Flame retardant properties of the poly-BCMO were also investigated.