PTHF-PPO共聚醚的合成及其聚氨酯弹性体性能研究

Synthesis of PTHF-PPO and Study on Properties of PTHF-PPO Elastomer

以大分子聚四氢呋喃醚二醇为起始剂,三氟化硼乙醚络合物为催化剂,环氧丙烷经阳离子开环聚合,直接在聚四氢呋喃醚二醇的两端接上了聚环氧丙烷的链段,从而制备出了一种全新结构的聚四氢呋喃-聚环氧丙烷(PTHF-PPO)端羟基嵌段共聚醚。通过核磁共振氢谱(1H-NMR)对产物进行了表征,凝胶渗透色谱测出了产物的相对分子质量。并以合成的PTHF-PPO共聚醚为原料制备出了聚氨酯弹性体,研究了PTHF-PPO聚氨酯弹性体的力学性能和热性能,结果发现,PTHF-PPO聚氨酯弹性体综合力学性能较好,玻璃化转变温度(T g=-62.59℃)较低,热稳定性好。

The new hydroxyl-terminated copolyether of PTHF-PPO was synthesized by epoxy propane cationic ring-opening polymerization and polypropylene glycol chains connected with the two terminals of polyoxytertrameth-ylene glycol （PTMG） using PTMG as macroinitiator and boron-trifuoride ethylether complex （BF3·OEt2 ） as the catalyst. The macromolecular structure of copolyether was also characterized by I H-NMR. The molecular weight of copolyether was determined by detectors gel chromatography （GPC）. Moreover, polyurethane elastomers were prepared with PTHF-PPO, and the mechanical and thermal properties of polyurethane were studied. The results showed that PTHF-PPO polyurethane elastomer had better mechanical properties, low glass transition temperature （Tg = -62.59℃） and good thermal stability.