Development of poly(vinylidene fluoride-trifluoroethylene) films and its quasi-static and dynamic strain responseAuthor(s): Anjana Jain, Jayanth S.Kumar, Roy D.Mahapatra, Vivek T.Rathod
Thin films of poly(vinylidene fluoride-trifluoroethylene) P(VDF-TrFE)were prepared using solvent cast method and characterized for structural, mechanical and surface morphological properties to investigate the presence of ïÂ¢-phase through X-ray diffraction, scanning electronmicroscopy, differential scanning calorimeter, Raman and Infrared spectra, and tensile testing. The conditions to achieve ïÂ¢-phase of P(VDF-TrFE) have been discussed in detail. Following the material characterization, the fabricated ïÂ¢- phase P(VDF-TrFE) sensors have been tested for dynamic strain sensing application. Time response from the ïÂ¢-phase P(VDF-TrFE) sensor due to the free vibration and impact on beam structure is obtained and is compared with ïÂ¢-phase PVDF sensor and conventional piezoelectric wafer type sensor. The variations in the frequency response spectra due to free vibration and impact loading conditions are also reported, which reveal the fact that the sensitivity of the ïÂ¢-phase P(VDF-TrFE) sensor to variousmodes of vibration is same as the ïÂ¢-phase PVDF sensor. The resonant and antiresonant peaks in the frequency response of ïÂ¢-phase P(VDF-TrFE) films match well with that of ïÂ¢-phase PVDF sensor and Lead zirconate titanate (PZT) wafer sensors. Thus the fabricated ïÂ¢-phase P(VDF-TrFE) sensors can be effectively used as the dynamic strain sensor.