C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 65/24 (2006.01) C06B 45/10 (2006.01) C08G 65/325 (2006.01)
Patent
CA 2061744
ABSTRACT The invention disclosed relates to novel branched chain hydroxy-terminated aliphatic azido polymers and copolymers with variable molecular weight (MW) and a single step method for the preparation thereof which involves respectively reacting a high (MW) 0.5 - 5.0 x 106) solid rubbery polyepichlorohydrin (PECH) homopolymer and epichlorohydrin/alkylene oxide copolymer (PEEC), with an alkali metal azide in a suitable organic solvent, in the presence of an initiator at elevated temperature. The MW of the azido product may be controlled by including in the reaction mixture a basic degradation catalyst (such as LioCH3 or NaOH) and varying the amount of catalyst. When the reaction is catalyzed, the MW of the product varies within the range 1,000 - 40,000 and the hydroxyl functionality is 2 - 10. Uncatalyzed reactions yield products with MW between 40,000 and 200,000 and a functionality of about 10. The branched azido polymers and copolymers yield energetic binders with improved mechanical properties and thermal stability which are useful in rocket propellants and composite explosives formulations.
Ahad Elie
Aspila Kalevi P.
Her Majesty The Queen In Right Of Canada As Represented By The M
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