申请人:Her Majesty the Queen in right of Canada, as represented by the Minister
公开号:US05191034A1
公开(公告)日:1993-03-02
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.times.10.sup.6) 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 LiOCH.sub.3 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.
本发明涉及一种新型支链羟基终止的脂肪族叠氮聚合物和共聚物,其分子量(MW)可变,并且提供一种单步制备方法,该方法分别在适当的有机溶剂中,在高温下以反应高(MW)0.5-5.0×10^6的固体橡胶状聚环氧氯丙烷(PECH)均聚物和环氧氯丙烷/脂肪族氧化物共聚物(PEEC)与碱金属叠氮化物反应,并在引发剂的存在下进行。通过在反应混合物中包含碱性降解催化剂(如LiOCH3或NaOH)并改变催化剂的量,可以控制叠氮产物的分子量。当反应被催化时,产物的MW在1,000-40,000范围内变化,羟基功能为2-10。未催化的反应产物的MW在40,000到200,000之间,功能约为10。支链叠氮聚合物和共聚物产生具有改善机械性能和热稳定性的高能量粘合剂,可用于火箭推进剂和复合炸药配方中。