New potassium sodium niobate/poly(vinylidene fluoride) functional composite films with high dielectric permittivity

作者：Lin, Jiaqi; Chen, Gaoru; Yang, Wenlong^*; Li, Huan; Lei, Qingquan

来源：Journal of Polymer Research, 2016, 23(8): 152.

DOI：10.1007/s10965-016-1051-0

• Na0.5K0.5NbO3
• Poly(vinylidene fluoride)
• Composite materials
• Thin films
• Dielectric properties

New and homogeneous KNN/PVDF functional hybrid films loaded with 2 vol.%, 4 vol.%, 9 vol.%, 21 vol.%, 30 vol.%, and 40 vol.% Na0.5K0.5NbO3 (KNN) have been prepared by a solution casting process. The effects of the doping KNN particles on the structure, morphology, and dielectric properties of KNN/PVDF hybrid films were investigated. The introduction of KNN fillers has a remarkable influence on the alpha-, beta-, gamma-phase structure and the crystallinity of the polymer matrix. And it is also effective in improving the dielectric performance. A dielectric permittivity as high as 250 is obtained at 10 Hz when the concentration of the KNN filler reaches 30 vol.%, which is 28 times higher than that of the pure PVDF matrix. The conductivity of the hybrid film with 40 vol.% KNN concentrations is lower than 8 x 10(-10) (S cm(-1)) at 10(2) Hz and at room temperature, which shows its excellent insulativity and the potential to be applied into the electronic industry.

• 出版日期2016-7-19
• 单位哈尔滨学院; 哈尔滨工业大学