C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 65/32 (2006.01) C06B 45/10 (2006.01) C08G 65/30 (2006.01) C08G 65/325 (2006.01)
Patent
CA 2137776
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 copo- lymer (PEEC), with an alkali metal azide in a suitable organic solvent, in the presence of an initiator at elevated tempera- ture. 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 proudct varies within the range 1,000-40,000 and the hydroxyl functionality is 2-10. Uncatalyzed reactions yield products with MW be- tween 40,000 and 200,000 and a functionality of about 10. The branched azido polymers and copolymers yield energetic bin- ders with improved mechanical properties and thermal stability which are useful in rocket propellants and composite explo- sives formulations.
Aspila Kalevi P.
Her Majesty The Queen In Right Of Canada As Represented By The M
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