化工新型材料

化工新型材料 ›› 2023, Vol. 51 ›› Issue (10) : 91-96. DOI: 10.19817/j.cnki.issn1006-3536.2023.10.020

新材料与新技术

CNTs/BTNWs/PVDF三相复合材料的制备及介电性能研究

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Preparation and dielectric properties research of CNTs/BTNWs/PVDF three-phase composites

Zhang Yang, Cai Huiwu, Du Yue, Wang Kefan, Qiang Yueyue, Su Pengcheng

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Received		Published
2022-06-25		2023-10-20
Issue Date	Revised Date
2023-10-27	2022-06-25

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摘要

采用两步水热法制得高长径比钛酸钡纳米线(BTNWs),并采用溶液法制备了介电性能优异的碳纳米管(CNTs)/BTNWs/聚偏氟乙烯(PVDF)三相复合材料,研究了CNTs和BTNWs掺入量对三相复合材料介电性能和击穿性能的影响。通过扫描电子显微镜和X射线衍射仪对三相复合材料的形貌、结晶行为进行了表征。结果表明:当水热温度为95℃、反应时间为24h时,BTNWs的长径比最高;CNTs及BTNWs在复合材料中均匀分散无明显团聚现象。介电性能分析表明:BTNWs能够有效降低CNTs之间的接触,有效提升复合材料介电性能和击穿性能;在频率为10³Hz条件下,当CNTs掺入量为5%(质量分数),BTNWs掺入量为15%(质量分数)时三相复合材料的相对介电常数高达24.7且介电损耗仅为0.12。

Abstract

BaTiO₃ nanowires(BTNWs) with a high aspect ratio were prepared by two-step hydrothermal method,and then carbon nanotubes (CNTs) were used as dielectric fillers to obtain CNTs/BTNWs/polyvinylidene fluoride(PVDF) three-phase composites with excellent dielectric properties by solution casting method.The effects of CNTs and BTNWs doping on the dielectric properties and breakdown properties of three-phase composite materials were investigated.The micromorphology and crystallization behavior of three-phase composite materials were characterized by scanning electron microscope(SEM) and X-ray diffraction (XRD).The results indicated that,when the hydrothermal conditions was 95℃ and the reaction time was 24h,the aspect ratio of BTNWs was the highest,and CNTs and BTNWs were evenly dispersed in the composites without obvious agglomeration.The dielectric properties analysis showed that BTNWs effectively reduced the contact between CNTs and improved the dielectric properties and breakdown properties.At a frequency of 10³Hz,the content of CNTs was 5%(wt) and BTNWs was 15%(wt),the dielectric constant of the composite was as high as 24.7 and the dielectric loss was only 0.12.

关键词

钛酸钡纳米线 / 碳纳米管 / 水热法 / 聚偏氟乙烯

Key words

BaTiO₃ nanowires / CNTs / hydrothermal method / PVDF

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CNTs/BTNWs/PVDF三相复合材料的制备及介电性能研究[J]. 化工新型材料, 2023, 51(10): 91-96 DOI:10.19817/j.cnki.issn1006-3536.2023.10.020

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