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Development and thermo-mechanical behavior of nanocomposite epoxy adhesives

机译：纳米复合环氧胶粘剂的开发及其热力学行为

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Two kinds of organo-modified (OM) clays were dispersed in an epoxy resin for the preparation of nanocomposite adhesives at various filler amounts. XRD tests evidenced the formation of intercalated structures, increasing the intercalation degree with the clay hydrophilicity. The original transparency of the samples was retained up to a filler content of 3 wt%, and then decreased due to filler agglomeration. The glass transition temperature of nanocomposites filled with the more hydrophilic clay (30B) raised up to a filler content of 3 wt% and then decreased, probably because of the concurrent and contrasting effects of the physical chain blocking and reduction of the cross-linking degree. Also elastic modulus, stress at break, and fracture toughness were sensibly improved by nanoclay addition up to filler loadings of 0.5-1 wt%. For higher concentrations the positive contribution of clay nanoplatelets was counterbalanced by the presence of agglomerated tactoids in the matrix. Mechanical tests on single-lap composite (epoxy/glass) bonded joints evidenced an enhancement of the shear strength by about 25% for an optimal filler content of 1 wt%. Therefore, it was concluded that the addition of a proper amount of OM clay to epoxy adhesives could represent an effective way to improve the shear resistance of adhesively bonded composite structures.
机译：将两种有机改性（OM）粘土分散在环氧树脂中，以制备各种填料量的纳米复合粘合剂。 XRD测试证明了插层结构的形成，随着粘土的亲水性增加了插层度。样品的原始透明度得以保留，直到填料含量达到3 wt％，然后由于填料附聚而降低。填充了亲水性更高的粘土（30B）的纳米复合材料的玻璃化转变温度升高至填充剂含量为3 wt％，然后下降，这可能是由于物理链阻断和交联度降低同时发生和形成对比。此外，通过添加纳米粘土直至填料含量为0.5-1 wt％，弹性模量，断裂应力和断裂韧性也得到了明显改善。对于更高的浓度，由于基质中存在聚集的触针，从而抵消了粘土纳米片的积极作用。在单搭接复合材料（环氧树脂/玻璃）粘合接头上进行的机械测试表明，对于1 wt％的最佳填料含量，其抗剪强度提高了约25％。因此，得出的结论是，向环氧胶粘剂中添加适量的OM粘土可以代表一种提高胶粘复合结构的抗剪强度的有效方法。

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