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To address the resource dependence and recycling challenges faced by traditional petroleum-based epoxy resins in power equipment applications, this study synthesized a fumarate epoxy matrix (FPAE) from renewable rosin through Diels-Alder addition reaction. A curing agent (BDB) containing boronic ester dynamic bonds was used to construct a cross-linked network via thiol-epoxy click chemistry, and a rosin-based epoxy vitrimer material (FPAE-BDB) was prepared. The thermal, mechanical, and electrical properties, as well as degradation and recyclability characteristics of the material were systematically characterized by dynamic thermomechanical analysis (DMA), thermogravimetric analysis (TGA), tensile tests, dielectric spectroscopy tests, breakdown strength tests, and degradation/reprocessing experiments. The results show that the material exhibits excellent thermal properties. Its glass transition temperature (131.8℃) increased by 8.3% compared to the commercial DGEBA-MHHPA system (121.6℃). Its initial decomposition temperature (Td5%=332.4℃) and 50% thermal weight loss temperature (Td50%=408.6℃) are comparable with those of DGEBA-MHHPA system. Its characteristic breakdown strength reaches 44.38 kV/mm, which is 7.3% higher than the 41.35 kV/mm of DGEBA-MHHPA. Its dielectric constant remains stable at 3.5-3.8, and its dielectric loss factor is slightly higher than that of DGEBA-MHHPA. Additionally, the material demonstrates good chemical degradation and recyclability, which can efficiently degrade in acidic H2O2 solution at room temperature. After crushing, it is hot pressed at 160℃ and reshaped, its breakdown strength retention rate attains 92.5%. However, due to its rigid phenanthrene ring structure, the material exhibits high brittleness, leading to shortcomings in mechanical properties, and its tensile strength (38.9 MPa) is lower than that of the DGEBA-MHHPA system(72.1 MPa). In summary, compared to the DGEBA-MHHPA system, the FPAE-BDB system shows good thermal, electrical, and recovery properties. Future work may involve toughening modification to enhance its mechanical properties.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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