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以大分子聚乙二醇为引发剂(起始剂),三氟化硼乙醚络合物为催化剂,在少量环氧丙烷助开环的条件下,四氢呋喃发生阳离子开环聚合,直接在聚乙二醇的两端接上了聚四氢呋喃醚链段,从而制备出了一种全新结构的PTHF-PEO-PTHF端羟基三嵌段共聚醚(HTPE),采用红外光谱和核磁共振1H NMR对产物进行了表征,并以合成的HTPE为原料制备出了聚氨酯弹性体,研究了HTPE聚氨酯弹性体的力学性能和热性能。结果发现,HTPE聚氨酯弹性体不但综合力学性能较理想,而且具有玻璃化转变温度较低(Tg=-69.03℃),热稳定好的特点,满足固体推进剂对粘合剂的使用要求。
Using macromolecule polyethylene glycol as initiator (initiator) and boron trifluoride etherate as catalyst, a ring-opening polymerization of tetrahydrofuran occurred in a small amount of propylene oxide to aid ring-opening polymerization, A new structure of PTHF-PEO-PTHF hydroxyl-terminated triblock copolyether (HTPE) was prepared by attaching poly (tetrahydrofuranyl ether) segments to both ends of diol. The products were characterized by FTIR and NMR The mechanical properties and thermal properties of HTPE polyurethane elastomer were studied by characterization. The polyurethane elastomer was prepared from synthetic HTPE. The results showed that HTPE polyurethane elastomer not only had better comprehensive mechanical properties, but also had the characteristics of low glass transition temperature (Tg = -69.03 ℃) and good thermal stability, which satisfied the requirement of solid propellant for adhesives.