High dielectric constant poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) for capacitive pressure and bending sensors

POLYMER

卷:214

Article

Pereira, N.^1,2  Goncalves, S.^1,2,3  Barbosa, J. C.¹  Goncalves, R.⁴  Tubio, C. R.⁵  Vilas-Vilela, J. L.^5,6  Costa, C. M.^1,4  Lanceros-Mendez, S.^5,7 

[1] Univ Minho, Ctr Phys, P-4710058 Braga, Portugal

[2] Univ Minho, Ctr ALGORITMI, Campus Azurem, P-4800058 Guimaraes, Portugal

[3] Univ Minho, EngageLab, P-4810453 Guimaraes, Portugal

[4] Univ Minho, Ctr Chem, P-4710058 Braga, Portugal

[5] Basque Ctr Mat Applicat & Nanostruct, BCMat, UPV EHU Sci Pk, Leioa 48940, Spain

[6] Univ Basque Country, UPV EHU, Fac Ciencia & Tecnol, Dept Quim Fis, Apdo 644, Bilbao, Spain

[7] Ikerbasque, Basque Fdn Sci, Bilbao 48009, Spain

关键词: Fluorinated polymers;    Dielectric constant;    Capacitive sensors;    Bending sensors;    Solvent casting;   

DOI  :  10.1016/j.polymer.2020.123349

来源: Elsevier

【 摘 要 】

Poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene), P(VDF-TrFE-CFE), samples were prepared by solvent casting by varying polymer concentration and solvent evaporation temperature. Different sample morphologies were obtained depending on the processing conditions, as well as different physical-chemical properties such as degree of crystallinity, mechanical and dielectric properties. On the other hand, the electroactive beta-phase content and the degradation temperature of the P(VDF-TrFE-CFE) samples are independent of the processing conditions. At 1 kHz, the highest dielectric constant, epsilon' = 40, was obtained for the samples prepared with 15 wt% polymer concentration in solutions and processing conditions based on solvent evaporation and polymer melting at 210 degrees C. Taking into account the high dielectric response, pressure and bending capacitive sensors were developed with excellent response and high sensibility (0.03 kPa(-1)). The developed materials were evaluated for bending and force detection applications. Thus, it is concluded that the developed P(VDF-TrFECFE) films are suitable for a new generation of multifunctional materials for capacitive sensing applications, including both force and deformation sensors and touchpads.

【 授权许可】

Free