共聚醚P（E－CO－T）及其与N－100固化后的聚醚聚脲聚氨酯的热分解性能

Thermal Degradation Characteristics of Co-Polyether (EO-THF) and the Poly (ether-urethane-urea) Cured by N-100

采用热失重分析法考察了端羟基环氧乙烷／四氢呋喃共聚醚及其与Ｎ－１００固化后的聚醚聚脲聚氨酯胶片的热分解性能．讨论了增塑剂（邻苯二甲酸二丁酯、硝化甘油和１，２，４－丁三醇三硝酸酯混合物）、固体填料（铝粉、高氨酸铵和奥克托今）以及助剂（碳黑、硝化纤维素和健合剂）对聚醚聚脲聚氨酯胶片热分解性能的影响．结果表明共聚醚在惰性环境中于２００℃左右开始分解．抗氧剂（２，６－二叔丁基－４－甲基酚）能有效提高共聚醚的分解稳定性；含增塑剂、固体填料和助剂的聚氨酯胶片的热分解性能以及抗氧剂的稳定效果因增塑剂、填料和助剂的不同而有较大差别．

The titled new poly(ether-urethane-ureea ) is synthesized from co-polyether (ethyleneoxide- tetrahydrofuran ) and N - 1 00 (addition product o f hexamethylene diisocyanate (HDI) and water). The thermal stability and degradation of both the co-polyether and the poly (ether - urethane - urea ) are analyzed with thermogravimetry (TG). The main Propellant ingredients effects on the elastomer's thermal stability were extensively investigated, where plasticizers (DBP, mixture of NG/BTTN ), fillers (AP, HMX, A1) and additives (carbon black, nitrocellulose and a coupling angent) were involved. Results show that under the atmosphere of nitrogen the co-polyether begins to degrade at about 200 ℃ and the thermal stability can be effectively improved by antioxidant (2,6-di-tert-butyl-4-methyl phenol). For the elastomers, however, both the thermal degradation of the poly(ether-urethane -urea ) elastomers and the stabilimtion of the antioxidant are varied with plasticizers, fillers and additives contained.