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After long-term hygrothermal ageing, the bonding between fibers and resin in basalt fiber composites is prone to damage, making the development of hygrothermal ageing-resistant coatings become a key factor in advancing the application of basalt fibers. In this paper, the construction of hygrothermal-resistant sizing coatings was carried out through molecular dynamics simulation and first-principles molecular dynamics simulation. The effects of four types of epoxy emulsions—diglycidyl ether of bisphenol A (DGEBA), dimer acid-modified epoxy resin (DAER), hydrogenated bisphenol A epoxy resin (HBPA), and cycloaliphatic epoxy resin (CER)—used as sizing coatings for basalt fibers on the hygrothermal resistance of basalt fiber reinforced polymer (BFRP) were simulated and analyzed. The results show that owing to the low polarity and high energy gap of the primary crosslinking structure formed by CER and MHHPA, the CER-modified basalt fiber (BF-CER) imparts the best insulation performance to the composite; meanwhile, its high interfacial binding energy results in the highest flexural strength among the four types of samples. Due to its strong dielectric barrier capability and high binding energy stability, BF-CER displays the best stability in mechanical and electrical properties within 20 h of ageing. During ageing from 20 h to 120 h, the HBPA-modified basalt fiber shows the highest stability owing to its lower degree of hygrothermal degradation. In summary, BF-CER possesses the most outstanding hygrothermal ageing resistance.
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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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