Zhan Yunpeng, Yang Xu, Yang Jiaming, Hou Shuai, Fu Mingli
Electric Power Research Institute, China Southern Power Grid, Guangzhou 510663, China.
Key Laboratory of Engineering Dielectrics and Its Application, Harbin University of Science and Technology, Harbin 150080, China.
Polymers (Basel). 2023 Dec 22;16(1):46. doi: 10.3390/polym16010046.
To achieve exceptional recyclable DC cable insulation material using thermoplastic polypropylene (PP), we have introduced the organic polar molecule styrene-maleic anhydride copolymer (SMA) into PP-based insulation materials following the principles of deep trap modification. PP, PP/SMA, PP/ethylene-octene copolymer (POE), and PP/POE/SMA insulating samples were prepared, and their meso-morphology, crystalline morphology, and molecular structure were comprehensively characterized. The results indicate that SMA can be uniformly dispersed in PP with minimal impact on the crystalline morphology of PP. The DC electrical properties of the materials were tested at temperatures of 30, 50, and 70 °C. The findings demonstrate that the introduction of SMA can improve the DC properties of the material in both PP and PP/POE. The thermal stimulated depolarization current results reveal that SMA can introduce deep traps into the material, thereby improving its DC properties, which is in agreement with the quantum chemical calculation results. Subsequently, a bipolar carrier transport model was employed for coaxial cables to simulate the space charge distribution in the insulation layer of the four sets of insulation samples as well as the actual cable in service. The results highlight that SMA can significantly suppress space charge in PP and PP/POE systems, and it exhibits excellent electric field distortion resistance. In summary, the results illustrate that SMA is expected to be used as an organic deep trap modifier in PP-based cable insulation materials.
为了利用热塑性聚丙烯（PP）制备出具有优异可回收性的直流电缆绝缘材料，我们依据深陷阱改性原理，将有机极性分子苯乙烯-马来酸酐共聚物（SMA）引入到基于PP的绝缘材料中。制备了PP、PP/SMA、PP/乙烯-辛烯共聚物（POE）以及PP/POE/SMA绝缘样品，并对它们的细观形态、结晶形态和分子结构进行了全面表征。结果表明，SMA能够均匀地分散在PP中，对PP的结晶形态影响极小。在30、50和70°C的温度下测试了材料的直流电学性能。研究结果表明，SMA的引入能够改善PP和PP/POE中材料的直流性能。热刺激去极化电流结果表明，SMA能够在材料中引入深陷阱，从而改善其直流性能，这与量子化学计算结果一致。随后，采用双极载流子传输模型对同轴电缆进行模拟，以研究四组绝缘样品的绝缘层以及实际运行电缆中的空间电荷分布。结果表明，SMA能够显著抑制PP和PP/POE体系中的空间电荷，并且具有优异的抗电场畸变能力。总之，结果表明SMA有望用作基于PP的电缆绝缘材料中的有机深陷阱改性剂。
