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In order to obtain polypropylene based cable insulating materials with excellent dielectric properties, polypropylene based composites adding with nano MgO modified by silane coupling agent KH570 was prepared by melt blending method. The effect of nano MgO addition on the microstructure, dielectric properties, and mechanical properties of of the composites was studied. The results show that nano MgO promotes the transformation of polypropylene from α crystallographic orientation β, the interface of polypropylene and nano MgO is well bonded after the nano MgO is modified by KH570. The addition of nano MgO can inhibit charge injection, when the mass fraction of MgO is 1%, the composite has the smallest space charge density, which is 0.6 C/m2, while excessive addition of MgO can lead to local charge accumulation in the composites. When the mass fraction of nano MgO is 1%, the composite shows the highest tensile strength (24.6 MPa), while the breaking elongation decreases with the addition of MgO. The direct current breakdown strength of pure polypropylene based material is the lowest. At 100℃, the direct current breakdown strength of polypropylene based composite materials with a MgO mass fraction of 1% is the highest (302 kV/mm), which is only 28.77% lower than that at 20℃.
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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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