Thermoplastic polypropylene materials have excellent electrical properties and thermal properties, and their production process does not require cross-linking and degassing, with low energy consumption and recyclability. Compared with cross-linked polyethylene, it is environmentally friendly and one of the best materials for the production of power cable. Taking polypropylene materials as the discussion object, the basic structure and physical properties of polypropylene and their relationship with electrical properties were introduced in this paper. The effects of copolymerization modification, blending modification, chemical modification, and nano particle modification on the structure, mechanical, thermal and electrical properties of polypropylene were reviewed. The research progress and application of polypropylene cables at home and abroad were introduced. Finally, the furure development of polypropylene materials were summaried and prospected from the production and preparation technology of polypropylene, relationship between structure and properties, and modification techniques.
| 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 |