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The qualitative and quantitative characteristics of piezoelectric membranes manufactured with the polymer polyvinylidene fluoride, through the technique of electrospinning (TEH), using different synthesis processes, in particular using different solvents, were compared.
We fabricated micro fibrous (PVDF) membranes, using the electrospinning technique, in a 2:1 ratio of methyl ethyl ketone (MEC) solution and compared them with those manufactured by other authors, who used Dimethylformamide (DMF) as solvents. During the process, a potential difference of 15.0 kV was applied and the viscoelastic solution of the PVDF was maintained at a temperature of 60°C. The working hypothesis was based on analyzing the influence of the polymer solute on two specific properties: (1) the diameter of the microfibers of the PVDF polymeric material, synthesized through TEH and (2) in the formation of the rotational crystalline structure of the polymer, specifically in the beta (?) piezoelectric phase.
The following techniques were used to characterize the synthesized samples:
X-ray diffraction (XRD), where the samples generated dispersions at 2???? = 18.7º, 19.9º and 20.6º, which indicated that the crystalline structure obtained is typical of the alpha (?) and beta (?) piezoelectric phases.
The characterization of the samples obtained allowed us to find that the properties of the microfibrous membranes of the PVDF polymer are affected by the solvent used in the synthesis process. When making comparisons between membranes that only used DMF as a solvent, with our membranes manufactured with the DMF/MEC solvent, a higher concentration of beta (?) piezoelectric structural phase was generated in the latter, which have a greater application in power generating devices.
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