ETPE黏结剂对RDX-Al体系的包覆研究

摘要

In order to investigate the effect of the energetic thermoplastic polyurethane elastomer (ETPE) with number average molecular weight of about 20000 as binder synthesized by 3,3-bisazidemethyl oxetane (BAMO) and 3-azidemethyl-3-methyl oxetane (AMMO) on the sensitivity of RDX-AI moulding powder, the contact angle of ETPE with RDX and Al powder was measured. The adhesion work and spread modulus between ETPE and RDX as well as ETPE with Al powder were calculated by the contact angle data. The scanning electron microscopy (SEM) photography and mechanical sensitivity of the explosive moulding powders with different contents of ETPE were observed and measured. The results show that in RDX-AI system, ETPE is easily coated on the surface of RDX particle. With increasing the dosage of ETPE from 2％ to 5％ in the RDX/Al system,the viscosity of the explosive system increases, the hot-spots are easy to form under the impact condition and the mechanical sensitivity of the explosive moulding powder increases from 0％ to 40％, considering that when the ETPE with number average molecular weight about 20000 is used in pressed RDX-Al system explosives,the dosage of ETPE should be controlled within 5％.%为了研究以3,3-双叠氮甲基氧杂环丁烷(BAMO)与3-叠氮甲基-3-甲基氧杂环丁烷(AMMO)为基合成的含能热塑性弹性体(ETPE,数均分子量在20000左右)作黏结剂对黑索今(RDX)-铝粉(Al)体系炸药造型粉感度的影响,对ETPE,RDX和Al粉三者的接触角进行了测定,由接触角结果计算出ETPE与RDX和Al粉之间的黏附功和铺展系数,采用扫描电镜分析了三种不同黏结-钝感体系炸药造型粉的形貌,并测试了其相应的机械感度.结果表明,在RDX-Al体系中ETPE能够较好地包覆在RDX颗粒表面,但是随ETPE用量的增加(从2%增加到5%),炸药体系的粘度增大,在撞击作用下容易产生热点,炸药造型粉的撞击感度也从0%增加到40%.因此,采用数均分子量为20000左右的ETPE在压装RDX-Al体系炸药中使用时,应控制ETPE用量不大于配方总量的5%.