大分子引发端羟基PPO-PTHF-PPO嵌段共聚醚的合成和表征

Synthesis and Characterization of the Hydroxyl-Terminated Block Copolyether of PPO-PTHF-PPO by Macroinitiator Method

以大分子聚四氢呋喃醚二醇为引发剂,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PPO-PTHF-PPO端羟基三嵌段共聚醚;通过红外光谱、核磁共振(1H-NMR和13C-NMR)对产物进行了表征,通过凝胶渗透色谱测出了产物的相对分子质量。研究了反应条件对聚合产率以及产物相对分子质量的影响,结果表明,反应温度为0℃,反应时间为5h,催化剂用量为环氧丙烷摩尔数的3%时最为理想,并且可以通过大分子引发剂的用量来调节共聚醚产物的相对分子质量。

The new hydroxyl-terminated copolyether（PPO-PTHF-PPO） was synthesized by epoxy propane cationic ring-opening polymerization and polypropylene glycol chains connected with the two terminals of polytetrahydrofuran glycol（PTMG） with PTMG as macroinitiator and boron-trifuoride ethylether complex（BF3·OEt2） as the catalyst.The copolyether was purified by water,and molecular weight by size-exclusion chromatography（GPC）.The macromolecular structure of copolyether was also characterized by IR and 1H-NMR,13C-NMR.The effect of reaction conditions on the polymerization yield and molecular weight of the product was studied,the results show that the reaction temperature at 0 ℃,reaction time for 5h,the catalyst for 3% of propylene oxide molar amount are most satisfactory,and the molecular weight of copolyether can be adjusted by the dosage of macroinitiator.