Król Piotr, Król Bożena, Zenker Marek, Subocz Jan
Department of Polymer Science, Faculty of Chemistry, Rzeszów University of Technology, Al. Powstańców Warszawy 6, 35-959 Rzeszów, Poland.
Faculty of Electrical Engineering, Department of Electrotechnology and Diagnostic, West Pomeranian University of Technology, Szczecin, Ul. Sikorskiego 37, 70-313 Szczecin, Poland.
Colloid Polym Sci. 2015;293(10):2941-2947. doi: 10.1007/s00396-015-3697-2. Epub 2015 Jul 15.
The research was planned to test electrical properties of polymer films made from polyurethane cationomers with 0-2 wt.% graphene admixture. The cationomers were synthetized in the reaction of 4,4'-methylenebis(phenyl isocyanate), polycaprolactone diol ( = 2000), -methyldiethanolamine, and formic acid. It was found that addition of approx. 2 wt.% of graphene causes the loss of volume resistivity by three orders of magnitude and percolation threshold is already set at approx. 1 wt.%. The frequency characteristic of a real part of permittivity ' and imaginary part of permittivity ″ were measured for the tested films. On the base of Havriliak-Negami equation, parameters of relaxation functions in frequency domain were estimated for samples containing various contents of graphene. The influence of the cationomer phase structure on observed changes of dielectric losses coefficient tgδ in the full-measuring frequency spectrum was discussed.
该研究旨在测试由含0 - 2 wt.%石墨烯混合物的聚氨酯阳离子体制成的聚合物薄膜的电学性能。阳离子体是在4,4'-亚甲基双（苯基异氰酸酯）、聚己内酯二醇（ = 2000）、 -甲基二乙醇胺和甲酸的反应中合成的。发现添加约2 wt.%的石墨烯会导致体积电阻率损失三个数量级，且渗流阈值已设定在约1 wt.%。对测试薄膜测量了介电常数实部 ' 和介电常数虚部 ″ 的频率特性。基于Havriliak - Negami方程，对含有不同石墨烯含量的样品估计了频域中弛豫函数的参数。讨论了阳离子体相结构对全测量频谱中介电损耗系数tgδ观察到的变化的影响。
