NEPE推进剂溶胶的制备与表征

采用乙醚浸泡,氯仿索氏提取制备了硝酸酯增塑聚醚(NEPE)推进剂粗溶胶,然后通过乙醚少量多次洗涤法、色谱法、透析法3种方式进一步提纯制得NEPE推进剂纯溶胶;采用红外光谱、元素分析、核磁共振光谱、凝胶渗透-二极管阵列检测器表征了溶胶的化学组成。结果表明,NEPE推进剂溶胶由聚乙二醇多异氰酸酯固化反应的聚氨酯片段以及未反应完全的聚乙二醇组成;透析法成本低廉,所得溶胶纯净,杂质含量低于10~(-5)。NEPE推进剂溶胶的分子质量主要集中在10 000~41 800Da,约占总溶胶的80%。老化后推进剂溶胶中大分子聚合物相对较少。

Preparation and Characterization of NEPE Propellant Sol

The crude sol of nitrate ester plasticizer polyether (NEPE) propellant was prepared by means of ether immersion and chloroform Soxhlet extraction,and the further purification of sol was performed by three ways such as the ether repeated small washing method,chromatography and dialysis.The chemical composition of sol was characterized by infrared spectroscopy,elemental analysis,nuclear magnetic resonance spectroscopy and gel permeation-diode array detector.The results show that the NEPE propellant sol is composed of segments of polyurethane and non reactive polyethylene glycol from the curing reaction of polyethylene glycol with muti-isocyanate.The cost for dialysis is low,the obtained sol is pure and the impurity content is less than 10-5.The molecular weight range of NEPE propellant sol is mainly concentrated in 10000~41800Da,which accounts for about 80% of the total sol.After aging,higher molecular polymer in propellant sol is relatively less.