Display Research Center, Korea Electronics Technology Institute, 25 Saenariro, Bundang-gu, Seongnam 13509, Korea.
Int J Mol Sci. 2021 Jul 28;22(15):8097. doi: 10.3390/ijms22158097.
In response to the demand for high-performance materials, epoxy thermosetting and its composites are widely used in various industries. However, their poor toughness, resulting from the high crosslinking density of the epoxy network, must be improved to expand their application to the manufacturing of flexible products. In this study, ductile epoxy thermosetting was produced using thiol compounds with functionalities of 2 and 3 as curing agents. The mechanical properties of the epoxy were further enhanced by incorporating fumed silica into it. To increase the filler dispersion, epoxide-terminated polydimethylsiloxane was synthesized and used as a composite component. Thanks to the polysiloxane-silica interaction, the nanosilica was uniformly dispersed in the epoxy composites, and their mechanical properties improved with increasing fumed silica content up to 5 phr (parts per hundred parts of epoxy resin). The toughness and impact strength of the composite containing 5 phr nanosilica were 5.17 (±0.13) MJ/m and 69.8 (±1.3) KJ/m, respectively.
为满足对高性能材料的需求，环氧树脂热固性塑料及其复合材料在各行业得到了广泛应用。然而，由于环氧树脂网络的交联密度较高，其韧性较差，必须加以改善，才能将其应用拓展到柔性产品的制造领域。在这项研究中，使用官能度为 2 和 3 的硫醇化合物作为固化剂，制备了韧性环氧树脂热固性塑料。通过在其中加入气相法二氧化硅，进一步提高了环氧树脂的机械性能。为了提高填料的分散性，合成了端环氧基聚二甲基硅氧烷，并将其用作复合材料的组成部分。由于聚硅氧烷-二氧化硅的相互作用，纳米二氧化硅在环氧树脂复合材料中均匀分散，随着纳米二氧化硅含量的增加（最高可达 5 phr，即每百份环氧树脂中的份数），其机械性能得到提高。含有 5 phr 纳米二氧化硅的复合材料的韧性和冲击强度分别为 5.17（±0.13）MJ/m 和 69.8（±1.3）KJ/m。
