High-performance epoxy materials often necessitate curing at high-temperature, which can lead to defects, brittleness, deformation and processing difficulties. In this paper, the modifier sulfhydryl hyperbranched polysiloxane (HSiSH) was fabricated by the “one-pot” method. And investigated the effect of HSiSH on the curing temperature, mechanical and thermal properties of epoxy resin. The epoxy with the addition of 2.0 wt% HSiSH showcased superior comprehensive properties, including flexural strength of 159.37 MPa, impact strength of 24.77 kJ/m², and tensile shear strength of 14.02 MPa, as well as the thermal properties are improved. Moreover, the presence of 2 wt% HSiSH can facilitate the curing process reducing the apparent activation energy by 12.25%. The highly branched topology, chain entanglement, "rigid-flexible" -Si-O-C- segment and active groups improve the strength and toughness of the material. Simultaneously, the numerous reactive groups within HSiSH actively participate in the curing reaction, thereby enhancing the adhesion between the resin and the substrate surface which increasing the bonding performance of the adhesive. This study lays a solid theoretical foundation for developing high-performance epoxy resins cured at lower and moderate temperatures.

中文翻译：

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含有巯基超支化聚硅氧烷的环氧树脂，具有理想的机械性能和较低的固化温度


高性能环氧树脂材料通常需要在高温下固化，这可能导致缺陷、脆性、变形和加工困难。在本文中，改性剂巯基超支化聚硅氧烷 （HSiSH） 是通过“一锅法”制备的。并研究了 HSiSH 对环氧树脂固化温度、机械和热性能的影响。添加量为 2.0 wt% HSiSH 的环氧树脂表现出优异的综合性能，包括弯曲强度为 159.37 MPa、冲击强度为 24.77 kJ/m²、拉伸剪切强度为 14.02 MPa，热性能得到改善。此外，2 wt% HSiSH 的存在可以促进固化过程，将表观活化能降低 12.25%。高度支化拓扑、链缠结、“刚性-柔性”-Si-O-C- 链段和活性基团提高了材料的强度和韧性。同时，HSiSH 内的众多反应性基团积极参与固化反应，从而增强树脂与基材表面之间的粘合力，从而提高胶粘剂的粘合性能。本研究为开发在中低温固化的高性能环氧树脂奠定了坚实的理论基础。