The effect of epoxy–silicone copolymer content on the thermal and mechanical properties of cured epoxy resin modified with siloxane
The effect of epoxy–silicone copolymer content on the thermal and mechanical properties of cured epoxy resin modified with siloxane
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DOI：
10.1039/c4ra09230a
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发表时间：
2014-11
期刊：
影响因子：
3.9
通讯作者：
Yang Chen;Chenguang Zhou;Jin Chang;Huawei Zou;Mei Liang
中科院分区：
文献类型：
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作者：
Yang Chen;Chenguang Zhou;Jin Chang;Huawei Zou;Mei Liang
本研究采用环氧-嵌段-有机硅共聚物和端羟基有机硅低聚物分别通过物理共混和化学反应对双酚A型环氧树脂（DGEBA）进行改性。通过傅里叶变换红外光谱（FTIR）、核磁共振氢谱（1H-NMR）和环氧当量（EEW）测试表征了该环氧树脂的化学结构。两种样品均显示出比纯树脂更好的断裂伸长率和冲击强度。TGA-FTIR结果表明，改性环氧树脂在600 °C时的残留量随硅氧烷含量的增加而增加，但热稳定性较纯环氧树脂略有降低。形态学研究表明，悬臂梁缺口冲击强度的提高是由于有机硅的增韧作用，使有机硅相的粒径合适。因此，该改性环氧树脂具有良好的韧性和较高的热残重，在防腐涂料和结构粘接材料方面具有潜在的应用前景。
In this research, a bisphenol-A type epoxy resin (DGEBA) was modified with epoxy-block-silicone copolymers and hydroxyl-terminated silicone oligomers by physical blending and a chemical reaction, respectively. The chemical structure of the siloxane-bridged epoxy resin terminated by –OHs was characterized by Fourier transform infrared spectroscopy (FTIR), 1H-NMR and an epoxy equivalent weight (EEW) test. Both the samples showed better elongation at break and impact strength than neat resin. The TGA-FTIR results revealed that the residue of the modified epoxy resin at 600 °C increased with the increase in siloxane content, but the thermal stability was slightly reduced compared with that of the neat epoxy resin. Morphology studies indicate that the increase in izod notched impact strength is due to the suitable diameter of silicone phases because of the silicone toughening effect. Therefore, it is believed that the modified epoxy resin, with good toughness and high thermal residual weight, will have potential applications in anti-corrosion coatings and structure bonding materials.