BAMO monomer

BAMO monomer is synthesized by replacing the C-Cl bonds of 3,3-bis(chlorom-ethyl) oxetane (BCMO) with C-N3 bonds.I BAMO polymer has two N3 bonds per BAMO monomer unit. BAMO polymer is obtained by polymerizing the monomer... 

Since BAMO polymer is a solid at room temperature, BAMO monomer is copolymerized with tetrahydrofuran (THF) in order to formulate a liquid BAMO copolymer that is used as a binder in propellants and explosives, as shown in Fig. 4.9. The terminal OH groups of the BAMO-THF copolymer are cured by reaction with the NCO groups of hexamethylene diisocyanate (HMDl) and then cross-linking is carried out with trimethylolpropane (TMP). The physical properties of such a copolymer with a BAMO/THF composition of 60/40 mol% are shown in Table 4.7.1151... 

The energetic nature of the azido group makes its incorporation into energetic polymers and binders very desirable. 3,3-Bis(azidomethyl)oxetane (BAMO) (28) and 3-azidomethyl-3-methyloxetane (AMMO) (33) are energetic monomers which on polymerization result in the energetic polymers poly[BAMO] (32) and Poly[AMMO] (34), respectively, both of which are under evaluation as potential energetic alternatives to HTPB in composite propellant formulations. ... 

Azide polymers contain -N3 bonds within their molecular structures and burn by themselves to produce heat and nitrogen gas. Energetic azide polymers burn very rapidly without any oxidation reaction by oxygen atoms. GAP, BAMO, and AM-MOare typical energetic azide polymers. The appropriate monomers are cross-Hnked and co-polymerized with other polymeric materials in order to obtain optimized properties, such as viscosity, mechanical strength and elongation, and temperature sensitivities. The physicochemical properties GAP and GAP copolymers are described in Section 4.2.4. 

The synthesis of AMO involves treatment of 3,3-bis(chloromethyl) oxetane (BCMO) with sodium azide in the DMF medium at 85 °C for 24 h. Similarly, AMMO which is a monofunctional analog of AMO is synthesized by the azidation of chloro/tosylate product of 3-hydroxymethyl-3-methyl oxetane (HyMMO) with sodium azide in DMF medium at elevated temperatures. These energetic monomers are readily polymerized to liquid curable prepolymers with the help of boron trifluoride etherate/l,4-butanediol initiator system and the outlines of synthesis [147-150] of poly(BAMO) [Structure... 

BAMO is perhaps the most prominent among the azido oxetanes class in terms of the number of polymers and copolymers reported so far. Due to its symmetrical azido groups, it assumes special significance as a hard block repeating unit in a thermoplastic elastomer. However, the homopolymer is solid and cannot be used directly for binder applications because of its crystal-tine nature. Also, poly(BAMO) shows relatively poor mechanical properties as a binder for solid rocket propellants [153]. Many copolymers of BAMO with non-energetic co-monomers tike tetrahydrofuran (THF) have been reported. The BAMO-THF copolymer is an excellent candidate for binder applications with its energetic BAMO content coupled with the THF block which affords... 

Poly-BAMO is synthesized via cationic polymerisation from the monomer 3,3-bis(azidomethyl)l-oxetane (BAMO). The polymerisation reaction is quenched with water to get polymer chains with hydroxyl endgroups which enable to react these pre-polymers later with isocyanate for curing reaction. Poly-BAMO has one of the highest nitrogen content of the - energetic binder components and is suggested for composite propellants. It is in the scope of actual research. 

N2 is also present. No doubt, the decomposition process begins in the methylazide group [10]. Fast thermolysis of the azidomethyl oxetane monomers that polymerize to form AMMO and BAMO yields products that are... 

DMO was copolymerized with BAMO (Run 7, Table III). Because of the very rapid polymerization, it was difficult to obtain a low conversion and to assess the copolymerization behavior of this monomer pair. However, vulcanizate properties on this product (Table III) were good, indicating a relatively uniform copolymer and thus a favorable copolymerization. 

Based on lO-g. total monomer. See Experimental for isolation details. TMO trimethylene oxide DMO 3,3-dimethyl oxetane BAMO S.3-bls... 

---