The cure kinetics of the epoxy-layered, silicate nanocomposites were studied by differential scanning calorimetry under isothermal and dynamic conditions. The materials used in this study were o-cresol novolac epoxy resin and phenol novolac hardener, with organically modified layered silicates. Various kinetic parameters, including the reaction order, activation energy, and kinetic rate constants, were investigated, and the storage stability of the epoxy-layered silicate nanocomposites was measured. To synthesize the epoxy-layered silicate nanocomposites, the phenolic hardener underwent pre-intercalation by layered silicate. From the cure kinetics analyses, the organically modified layered silicate decreased the activation energy during cure reaction in the epoxy/phenolic hardener system. In addition, the storage stability of the nanocomposite with the pre-intercalated phenolic hardener was significantly increased compared to that of the nanocomposite with direct mixing of epoxy, phenolic hardener, and layered silicate. This was due to the protective effect of the reaction between onium ions and epoxide groups.

中文翻译：

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预先嵌入酚类固化剂的邻甲酚酚醛清漆环氧纳米复合材料的固化动力学和储存稳定性研究

通过差示扫描量热法在等温和动态条件下研究了环氧层状硅酸盐纳米复合材料的固化动力学。本研究中使用的材料是邻甲酚酚醛清漆环氧树脂和苯酚酚醛清漆固化剂，以及有机改性的层状硅酸盐。研究了各种动力学参数，包括反应顺序，活化能和动力学速率常数，并测量了环氧层状硅酸盐纳米复合材料的储存稳定性。为了合成环氧层状硅酸盐纳米复合材料，对酚醛固化剂进行层状硅酸盐预插层。从固化动力学分析，有机改性的层状硅酸盐降低了环氧/酚醛固化剂体系中固化反应过程中的活化能。此外，与直接混合环氧树脂，酚醛硬化剂和层状硅酸盐的纳米复合材料相比，具有预插入的酚醛硬化剂的纳米复合材料的储存稳定性显着提高。这是由于鎓离子和环氧基之间的反应的保护作用。