Epoxy resin (ER) is one of the most important synthetic resins, but it has the disadvantage of lacking impact resistance. However, it can be improved by mixing with polyurethane resin (PU). In this study, Epon 828, triethylenetetramine (TETA), polytetramethylene ether glycol (PTMG), isophorone diisocyanate (IPDI), and dibutyltin dilaurate (DBTDL) were used as raw materials to prepare ER/PU interpenetrating polymer network structures (IPNs) by three different blending processes. The results showed the reactivity between TETA and IPDI were greater than that between TETA and ER. When ER/TETA/PTMG/IPDI/DBTDL were mixed at the same time, or ER and PU resins were prepared separately and then mixed, the ER/PU composites produced had a phase separation inside the structure. The most appropriate blending method was to mix ER with PTMG, IPDI, DBTDL first, and then add TETA after 10 min. The composite formed had a uniform appearance, and had better physical, mechanical, and thermal properties than the others did.

中文翻译：

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组分添加顺序对环氧树脂/聚氨酯树脂互穿聚合物网络结构性能的影响

环氧树脂（ER）是最重要的合成树脂之一，但它具有缺乏耐冲击性的缺点。但是，可以通过与聚氨酯树脂（PU）混合来改善它。在这项研究中，以Epon 828，三亚乙基四胺（TETA），聚四亚甲基醚二醇（PTMG），异佛尔酮二异氰酸酯（IPDI）和二月桂酸二丁基锡（DBTDL）为原料，通过三种方法制备ER / PU互穿聚合物网络结构（IPN）。不同的混合过程。结果表明，TETA与IPDI之间的反应性大于TETA与ER之间的反应性。当同时混合ER / TETA / PTMG / IPDI / DBTDL或分别制备ER和PU树脂然后混合时，所生产的ER / PU复合材料内部结构相分离。最合适的混合方法是先将ER与PTMG，IPDI，DBTDL混合，然后在10分钟后添加TETA。所形成的复合材料具有均匀的外观，并且比其他复合材料具有更好的物理，机械和热性能。