31 March 2010 Detailed studies on the formation of piezoelectric β-phase of PVDF at different hot-stretching conditions
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The β-phase of polyvinylidene fluoride (PVDF) is well known for its piezoelectric properties. PVDF films have been developed using solvent cast method. The films thus produced are in β-phase . The β-phase films are transformed to piezoelectric β-phase , when films are hot-stretched at different temperature, and with different stretching factors. Films are characterized for structural, tensile and surface morphological changes during the transformation from α- to β-phase by using X-ray diffraction, differential scanning calorimeter, Raman spectra, Infrared spectra, tensile testing, and scanning electron microscopy. The films showed increased crystallinity with stretching up to 80oC. The optimum conditions to achieve β-phase have been discussed in detail. The fabricated PVDF sensors have been tested for free vibration and impact on plate structure, and its response is compared with conventional piezoelectric wafer type sensor. The resonant and anti-resonant peaks in the frequency response of PVDF sensor match well with that of PZT.
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Anjana Jain, Anjana Jain, Jayanth Kumar S., Jayanth Kumar S., D. Roy Mahapatra, D. Roy Mahapatra, H. H Kumar, H. H Kumar, } "Detailed studies on the formation of piezoelectric β-phase of PVDF at different hot-stretching conditions", Proc. SPIE 7647, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010, 76472C (31 March 2010); doi: 10.1117/12.847351; https://doi.org/10.1117/12.847351

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