【摘要】 用IR、DSC等分析方法研究了端2-(口恶)唑啉聚环氧丙烷(活性聚醚)与环氧树脂的固化反应,对固化机理作了讨论。并考察了不同分子量活性聚醚对环氧树脂的增韧作用。结果表明,此活性聚醚对环氧树脂增韧效果明显,固化树脂综合性能较好。更多还原

【Abstract】 The curing reaction of epoxy resin with 2-oxazoline-terminated poly(propylene oxide) (active polyether) prepared by cyanoethylation and oxazoline. cyclization from hydroxy- terminated polyether is-studied by IRand DSC analysis. The apparent rate constants for different temperatures and apparent activation energy of the curing reaction are evaluated by DSC method. The mechanism of curing reaction is discussed. The physical :and mechanical .properties of cured epoxy system toughened by the active polyether with different molecular weights is estimated. The results show that via selecting the amount of polyether used and its MW, the cured systems may possess higher fracture toughness , while .retaining the valuable properties of the rigid system. The active polyether can be used as a kind of latent-curing and toughening agent for epoxy resin.更多还原