This project belongs to the discipline of polymer matrix composite materials. Clean and renewable power energy is a strategic emerging industry in my country, and the proportion of power generation continues to grow strongly year by year. The reality is that most of my country's renewable energy bases are far away from load centers, and long-distance and distributed transmission projects need to be vigorously developed. The corresponding transmission and distribution equipment needs to meet the requirements of compactness, high voltage, large capacity, and long life. However, the electrical and thermal conductivity properties of existing insulating materials are difficult to be improved synergistically and the lack of supporting high-performance semiconducting materials has become a bottleneck restricting the development of a new generation of transmission and distribution equipment. The design and preparation of insulating materials with synergistic improvement in electrical and thermal properties, performance research, application development and interpretation of collaborative improvement mechanisms have become cutting-edge issues in the field of functional composite materials. Focusing on solving the above bottleneck problems, the project team is committed to the research on design methods of high-performance insulating materials and multi-performance collaborative improvement mechanisms. New organic/inorganic nanocomposite strategies have been developed to improve the performance of insulating materials; original cutting-edge explorations have been carried out around the collaborative improvement mechanism of insulation and thermal conductivity properties, and the coordination mechanism of insulating materials and semiconducting materials. 1. Developed a ldquo; core-shell structurerdquo; strategy for preparing high-voltage resistant insulating materials. Each nanoparticle is finally covered by a polymer shell with controllable thickness and density, which completely solves the problem of difficult dispersion of nanoparticles. The electric field distribution in the nanocomposite can be optimized by adjusting the physical and Compared with traditional nanocomposites, the electrical strength of core-shell structure nanocomposites is increased by more than 100%, and has been extensively followed and studied by international colleagues. 2. Propose and develop strategies and mechanisms to synergistically improve the thermal conductivity and insulation properties of nanocomposites. A single functional group in a multi-functional macromolecule bonds with a high length-diameter ratio thermally conductive filler, and other functional groups bond with a polymer matrix, which not only solves the problem of uniform dispersion of a high length-diameter ratio thermally conductive filler, but also successfully solves the problem that conventional modification causes problems such as reducing the thermal conductivity of the filler itself. The nanocomposites prepared under the guidance of this strategy have enhanced thermal conductivity by up to 1360%, and their insulation properties have also been improved. 3. A coordination mechanism between nanocomposite insulating materials and semiconductive shielding materials has been established. The excellent properties of insulating materials can only be demonstrated with the good cooperation of semiconductive shielding materials. By constructing a three-dimensional conductive structure of nano-carbon materials with high aspect ratio and low-dimensional conductive carbon black, and adding a small amount of conductive fillers to obtain high conductivity, the surface of the material is smooth, and the probability of electric field distortion caused by surface protrusions is greatly reduced, effectively eliminating problems such as poor performance of semiconducting materials. As of the end of 2016, 54 SCI papers had been published in international journals highly recognized by his peers, and he cited SCI 3840 times. Among them, he cited 8 representative papers in SCI 1418 times, the highest SCI of a single paper was cited 284 times, and 4 papers were selected as ESI highly cited papers. The research results were reviewed by highlights such as the British Physical Society (IOP) and Science Today in Germany (Wissenschaft-aktuell), and were reviewed by Adv. Mater., Phys. Rev. Lett.，Chem.Rev., Chem. Soc. Rev. and Prog. Polym. Sci. et al. quoted and spoke highly of it. The main completion person, Huang Xingyi, was awarded the National Outstanding Youth and Young Yangtze River Scholar, and was invited to serve as the top journal in the field of dielectrics and insulation.

Deputy editor-in-chief of Transactions on Dielectics and Electrical Insulation and Composites, a top journal in the field of composites

Editorial Committee of Science and Technology. Based on the above theory, the polyolefin nanocomposite insulation materials and semiconductive shielding materials developed by the project team were used for the first time in the world in the manufacture of 320kV UHV DC cables.(The cable passed the pre-appraisal experiment of the National Wire and Cable Quality Supervision and Inspection Center, report number CT15 -0717), and the industrialization prospects are clear; the developed polyolefin nanocomposite insulated 75kV DC cable was put into operation in Baosteel in September 2015. It has been operating safely for more than 43 months so far, solving the problem that the cable life was no more than 6 months that has plagued the company for many years.