摘要
The influences of thermal cycling ageing on structures and insulation performances of polypropylene(PP)/elastomer/boron nitride(BN)nanocomposites are investigated.The Melt blending method was used to prepare the nanocomposites,in which propylene-based elastomer(PBE)or ethylene-octene copolymer elastomer(EOC)was contained for comparison.Then,the samples were treated using a thermal cycling process with a temperature range from-30 to 150℃,and the number of thermal cycles was set from 0 to 15.Scanning electron microscope(SEM),Fourier transform infrared spectroscopy(FTIR),differential scanning calorimetry and X-ray diffraction measurements were taken to facilitate the comprehension of structural changes.Additionally,measurements were taken to assess the trap distribution and direct current(DC)breakdown strength of the samples.The obtained results revealed that following thermal cycling ageing,the morphology and crystallinity of PP/PBE/BN remained almost unchanged.In contrast,PP/EOC/BN exhibited substantial microstructural damage accompanied by a significant reduction in crystallinity.As the number of thermal cycles increased,the trap level and DC breakdown strength of PP/PBE/BN were maintained at high levels,while those of PP/EOC/BN initially remained stable but then experienced a sharp decline.It is sug-gested that the addition of BN nanoparticles enhances the thermal cycling ageing resis-tance of the PP/PBE blend,whereas it weakens this resistance of the PP/EOC blend.
基金
National Natural Science Foundation of China,Grant/Award Number:52077151
State Key Laboratory of Electrical Insulation and Power Equipment,Grant/Award Number:EIPE23208
Key Laboratory of Engineering Dielectrics and Its Application,Ministry of Education,Grant/Award Number:KFM202203。
作者简介
Correspondence Yu Gao.Email:hmgaoyu@tju.edu.cn,ORCID:https://orcid.org/0000-0002-0493-8421;Jing Li ORCID:https://orcid.org/0000-0002-7046-0753;Boxue Du ORCID:https://orcid.org/0000-0002-7500-1134。
