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In order to obtain epoxy adhesive materials with high thermal stability for metal foil resistors, combining with molecular simulation and experiment, we studied the effects of molecular structures of methyl hexahydrophthalic anhydride (MeHHPA), methyl tetrahydrophthalic anhydride (MeTHPA), and hexahydrophthalic anhydride (HHPA) on the thermodynamic properties of epoxy adhesive materials for metal foil resistors. Firstly, the cross-linking models of three kinds of acid anhydride molecules and fluoren-based epoxy resin (DGEBF) were established, respectively, and the macroscopic thermodynamic parameters of the cross-linking models were analyzed through molecular simulation calculation. Secondly, the influence mechanism of the molecular structure of acid anhydride on the thermodynamic properties of the cross-linking system was explained according to microscopic parameters. Finally, the simulation results were verified by experiments. The results show that hexahydrophthalic anhydride system has the smallest free volume (FFV) and mean square displacement (MSD), and the free volume proportion is only 15.15%. In the experiment, the change trend of thermodynamic properties of the three kinds of curing anhydride system is consistent with the simulation results. The hexahydrophthalic anhydride system has the best thermodynamic performance, and its glass transition temperature reaches 435 K, bending strength reaches 84.46 MPa, and volumetric thermal expansion coefficient is only 1.65×10-4 K-1.
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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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