Kondrashov Stanislav V, Buryanskaya Evgeniya L, Osipkov Aleksey S, Kirkin Vladimir S, Butina Maria V, Mikhalev Pavel A, Ryzhenko Dmitry S, Makeev Mstislav O
Laboratory of Technologies of Polymer Ferroelectrics, Bauman Moscow State Technical University, Moscow 105005, Russia.
Laboratory of Physics of Oxide Ferroelectrics, National University of Science and Technology MISIS, Moscow 119049, Russia.
Int J Mol Sci. 2025 Jun 30;26(13):6309. doi: 10.3390/ijms26136309.
This paper considers the uniaxial orientation effect on the structure and piezoelectric properties of vinylidene fluoride-tetrafluoroethylene copolymer ferroelectric films. The films were exposed to uniaxial orientation stretching in a temperature range from 20 °C to 60 °C; then, they were contact polarized under normal conditions. The temperature dependence of the electric strength was determined. The longitudinal piezoelectric coefficient values were measured by the quasi-static Berlincourt method. The piezoresponse force microscopy (PFM) method was used to investigate the film domain structure before and after polarization, and the local piezoelectric coefficient values were also calculated. Phase composition was studied using differential scanning calorimetry and infrared spectroscopy with the Fourier transform. It was found that uniaxial orientation stretching contributed to an increase in the piezoelectric coefficient from 5 pC/N to 16-20 pC/N. The results obtained indicate the importance of the amorphous phase contribution to the formation of the piezoelectric properties in polymeric materials.
本文研究了单轴取向对偏二氟乙烯 - 四氟乙烯共聚物铁电薄膜结构和压电性能的影响。薄膜在20℃至60℃的温度范围内进行单轴取向拉伸；然后，在正常条件下进行接触极化。测定了电场强度的温度依赖性。纵向压电系数值通过准静态 Berlincourt 方法测量。利用压电响应力显微镜（PFM）方法研究了极化前后薄膜的畴结构，并计算了局部压电系数值。使用差示扫描量热法和傅里叶变换红外光谱法研究了相组成。发现单轴取向拉伸使压电系数从5 pC/N增加到16 - 20 pC/N。所得结果表明非晶相在聚合物材料压电性能形成中的贡献具有重要意义。
