Abstract
Epoxy based composites with reinforced dielectric properties were successfully synthesized by using TiO2 nanowires as inorganic filler. TiO2 nanoparticle/epoxy composites were also prepared as a contrast. TiO2 nanowires were synthesized by a hydrothermal method, with an average diameter of 50 nm and a length of 5 µm. TiO2 nanoparticles were purchased with average diameter of ~60 nm. Scanning electron microscopy images show that two types of fillers are both homogeneously dispersed in the matrix. Although the specific surface area of TiO2 nanoparticles is about twice of that of TiO2 nanowires, remarkable improved dielectric constant, enhanced electrical and thermal conductivity, higher space charge accumulation and stronger charge carrier mobility were observed in nanowire filled epoxy resin at the same filler content. Meanwhile, nanowires composites exhibit excellent glass transition temperature and thermal stability. These results indicated that the geometry of filler had a profound impact on the performance of epoxy composites, and nanowire filling is more effective than nanoparticle filling to enhance the properties of epoxy resin.
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Acknowledgements
This work was financially supported by the National Science Foundation of China (No. 51407134), (Innovative Research Group, No. 51221005), State Key Laboratory of Electrical Insulation and Power Equipment (No. EIPE14107) and China Postdoctoral Science Foundation (No. 2016M590619), Natural Science Foundation of Shandong Province (No. ZR2016EEQ28) and The Research Project of Postdoctoral Staff in Qingdao. The SEM work was done at International Center for Dielectric Research (ICDR), Xi’an Jiaotong University, Xi’an, China. The authors also thank Ms. Dai for her help in using SEM. The authors also thank their colleagues in laboratory for their support.
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Xie, Q., Cheng, Y., Chen, S. et al. Dielectric and thermal properties of epoxy resins with TiO2 nanowires. J Mater Sci: Mater Electron 28, 17871–17880 (2017). https://doi.org/10.1007/s10854-017-7728-2
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DOI: https://doi.org/10.1007/s10854-017-7728-2