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为改善叠氮聚醚推进剂的力学性能,拟在叠氮固化剂结构中引入极性强的氮杂环结构,通过增强分子间的作用力,来提高叠氮聚氨酯弹性体的力学性能。以氮杂环结构三元醇三羟乙基异氰尿酸酯(THEIC)为起始剂,环氧氯丙烷(ECH)为单体,按阳离子开环聚合反应制得氯化聚醚多元醇(CPP);CPP经叠氮化取代反应制备出叠氮聚醚多元醇(APP);APP与六次甲基二异氰酸酯(HDI)加成反应制得未见文献报导的叠氮固化剂(HAP)。通过对红外光谱、VPO数均相对分子质量(Mr)、羟值(OH)和异氰酸酯基含量(wNCO)等分析,对产物进行了结构鉴定与性能表征。胶片测试结果表明,在叠氮固化剂中引入强极性的氮杂环结构后,叠氮聚氨酯弹性体的力学性能有较大提高。GAP/HAP弹性体的拉伸强度和断裂伸长率分别为0.945 MPa和149.4%。引入乙二醇作扩链剂,相应弹性体的力学性能分别提高到1.438 MPa和161.16%。
In order to improve the mechanical properties of AZS polyether propellants, the azole structure with strong polarity is introduced into the azide curing agent structure to improve the mechanical properties of the azido polyurethane elastomer by enhancing the intermolecular forces. Starting from the heterocyclic compound of triethylalcohol trihydroxyethyl isocyanurate (THEIC), epichlorohydrin (ECH) is a monomer, which is prepared by cationic ring-opening polymerization to obtain chlorinated polyether polyol (CPP). The azido polyether polyol (APP) was prepared through the azide substitution reaction of CPP. The addition of APP to hexamethylene diisocyanate (HDI) ). The structure and characterization of the product were characterized by infrared spectroscopy, VPO number average molecular weight (Mr), hydroxyl value (OH) and isocyanate group content (wNCO). The film test results show that the mechanical properties of azide polyurethane elastomers have been greatly improved after the introduction of strong polar nitrogen heterocycles in the azide curing agent. The tensile strength and elongation at break of GAP / HAP elastomers were 0.945 MPa and 149.4% respectively. The introduction of ethylene glycol as chain extender, the corresponding elastomer mechanical properties were increased to 1.438 MPa and 161.16%.