摘要
在纳米氧化锆(纳米ZrO_(2))表面接枝氨基(NH_(2)),并与马来酸酐接枝聚丙烯(PP-g-MAH)和聚丙烯(PP)进行共混挤出,得到复合粒料。随后,通过流延及双轴拉伸工艺制备得到改性氧化锆/聚丙烯复合介电薄膜(NH_(2)-ZrO_(2)/PPg-MAH/PP)。在NH_(2)-ZrO_(2)/PP-g-MAH/PP介电薄膜中,通过NH_(2)-ZrO_(2)与PP-g-MAH进行反应,将PP接枝在NH_(2)-ZrO_(2)表面,以提高ZrO_(2)在PP基体中的分散性和相容性。同时,探究NH_(2)-ZrO_(2)/PP-g-MAH/PP复合薄膜的介电性能,热学性能和力学性能。结果表明,相关改性方法赋予了NH_(2)-ZrO_(2)/PP-g-MAH/PP的高的介电常数和击穿电压,同时显著地降低的介电损耗;在1kH测试频率下时,当NH_(2)-ZrO_(2)含量为2.5%时,NH_(2)-ZrO_(2)/PP-g-MAH/PP复合薄膜的介电常数相较于PP(2.25)提升至4.46,击穿场强可达到492 MV/m;同时,介电损耗降低至0.002 5。
Nano-zirconia(nano-ZrO_(2))was surface-grafted with amino groups(NH_(2))and then melt-blended with polypropylene-g-maleic anhydride(PP-g-MAH)and polypropylene(PP)to form composite pellets.These pellets were processed into dielectric films via casting followed by biaxial orientation.The grafting reaction between the NH_(2)groups on ZrO_(2)and the anhydride groups of PP-g-MAH improved the dispersion and compatibility of the nanoparticles within the PP matrix.The resulting NH_(2)-ZrO_(2)/PP-g-MAH/PP composite films exhibited enhanced dielectric,thermal,and mechanical properties.Specifically,at a test frequency of 1 kHz and with 2.5 wt%NH_(2)-ZrO_(2)content,the composite film achieved a dielectric constant of 4.46,significantly higher than that of pure PP(2.25),along with high breakdown strength of 492 MV/m and a low dielectric loss of only 0.0025.These results demonstrated that the applied modification strategy effectively yielded a composite film with a high dielectric constant and breakdown voltage while significantly suppressing dielectric loss.
作者
国江
许梦伊
黄想
郝好
游峰
李晨健
江学良
GUO Jiang;XU Mengyi;HUANG Xiang;HAO Hao;YOU Feng;LI Chenjian;JIANG Xueliang(State Key Laboratory of Power Grid Environmental Protection,Wuhan Branch of China Electric Power Research Institute Co,Ltd,Wuhan 430074,China;School of Materials Science and Engineering,Wuhan Engineering University,Hubei Provincial Key Laboratory of Plasma Chemistry and New Materials,Wuhan 430205,China)
出处
《中国塑料》
北大核心
2025年第12期33-38,共6页
China Plastics
基金
2023年湖北省科技计划立项项目(2023BAB001)。
关键词
氧化锆
聚丙烯
相容剂
介电常数
击穿场强
zirconia
polypropylene
compatibilizer
dielectric constant
breakdown field strength
