Abstract
PVDF-TrFE (70:30 mol%) powders were dissolved individually in three polar solvents of Diethyl Carbonate (DEC), Methyl Ethyl Ketone (MEK) and N-, N-, Dimethylformamide (DMF). The solution was spin coated and formed PVDF-TrFE films of 250 nm thickness; UN DEC, UN MEK and UN DMF films.  PVDF-TrFE powders were found to readily dissolve in DMF solvent as indicated by Hansen solubility parameters (δt). Hansen parameter showed small difference in reading (δt = 1.7) for PVDF-TrFE and DMF, and low relative energy difference (RED) value. All films were annealed at 120°C (AN DEC, AN MEK, AN DMF). The AN DMF film showed high presence of polar β-phase crystals as evident from the ATR-FTIR spectrum. This is given by the significant peaks at 848, 1190, and 1290 cm-1. The trend is consistent with XRD pattern, where relative increment of cps value (53%) at 19.2° (2θ) is observed. This further supports the high degree of β-phase crystals observed in AN DMF film. Â
Highlights
Polyvinylidene fluoride (PVDF) and its copolymers are widely used as polymeric materials for memory and storage devices due to their excellent dielectric properties [1,2,3]
PVDF-TrFE powders are dispersed at concentration of 30g/L in DMF, Methyl Ethyl Ketone (MEK) and Diethyl Carbonate (DEC) solvents individually
The annealed PVDF-TrFE thin film formed from dissolution in MEK, showed a further increased in cps value (43%)
Summary
Polyvinylidene fluoride (PVDF) and its copolymers are widely used as polymeric materials for memory and storage devices due to their excellent dielectric properties [1,2,3]. PVDF is a semicrystalline polymer with complex structure consisting of 4 crystalline phases; α-, β-, δ-, and γ-crystals. Copolymers of PVDF, such as PVDF-TrFE exhibits Curie temperature (Tc) in the range of 55 to 128 °C, depending on the percentage compositions of TrFE [4, 5]. Complete dissolution is possible when the charge or polarity of solute and solvent are comparable. This caused detachment of the molecules; and miscibility will follow. The favourable solvent for complete dissolution of PVDF-TrFE (70:30 mol.%) can be obtained. The effect of these solvents on their structural properties will be investigated
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