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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。通过红外光谱和核磁共振1H-NMR对产物进行了表征,并通过DSC和凝胶渗透色谱对产物进行了分析,考察了不同相对分子质量的共聚醚对弹性体力学性能的影响。研究了反应条件对聚合产率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6 h,环氧丙烷用量为四氢呋喃(THF)摩尔数的10%,催化剂用量为THF的4%时最为理想,并且可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。
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, The two ends of the diol are connected with the polytetrahydrofuran ether segment to prepare a new structure of PTHF-PEO-PTHF hydroxyl-terminated triblock copolyether. The products were characterized by 1H-NMR and 1H-NMR, and the products were analyzed by DSC and gel permeation chromatography. The effects of copolyether with different relative molecular mass on the mechanical properties of elastomer were investigated. The effects of reaction conditions on the polymerization yield and the relative molecular mass of the product were studied. The results showed that the reaction temperature was 0 ℃, the reaction time was 6 h, the amount of propylene oxide was 10% of the molar amount of THF, the amount of catalyst was THF Of the 4% of the most ideal, and by the amount of macromolecular initiator to adjust the relative molecular mass of the copolyether product.