发射药用聚二甲基丙烯酸乙二醇酯钝感包覆层性能研究

Research on Performance of PEDMA Deterring-coating-layer of Propellant

为研究高分子钝感发射药改变燃烧规律的机理,研究了其涂覆层的聚合条件。通过改变聚合方式、温度、时间、引发剂、聚合界面的方法,探讨了涂覆层的聚合工艺;通过材料试验机试验和热分解试验,研究了聚二甲基丙烯酸乙二醇酯(PEDMA)涂覆层在不同温度下的力学性能及其热分解规律。研究发现,采用合适的工艺可制得钝感发射药;PEDMA在单基药表面形成钝感层且存在过渡的互穿网络结构,涂覆层和基体药的力学性能受温度影响差别较大,这一特性是高分子钝感药温度系数低的原因之一。热分解研究表明,PEDMA钝感发射药改变了传统单基药的燃烧规律,具有延迟点火和变燃速的特点。

In order to study the mechanism of macromolecule deterring propellant on changing burning law, the polymerizing conditions, mechanical and thermal decomposition performance of coating-layer is studied. Through changing polymerizing ways, temperature, time, initiator and polymerizing interface test, the polymerizing technique of coating-layer is discussed. The mechanical performance and thermal-decomposing laws of PEDMA coating-layer at different temperatures are realized by material test and thermal-decomposing test, finding that deterring propellant can be prepared by right ways. On the surface of single-base propellant, PEDMA can form deterring layer, and have transitional cross-linked form. The different behaviors between coating-layer and base propellant at different temperatures, are one of the reasons that macromolecule deterring propellant has lower temperature coefficient. Thermal-decomposing studies show that PEDMA deterring propellant has changed tlae burning law of traditional single-base propellant, and has characteristics of delaying ignition and changing burning rate.