Sukwisute, Pisan

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Sukwisute, Pisan
Alternative Name
Sukwisute, P.
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Email
pisan.su@kmitl.ac.th

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    Item type:Publication,
    Enhancement of ferroelectric phase and dielectric properties of P(VDF-HFP) by NiCl2⋅6H2O nucleating agent
    (2019-01-02)
    Sukwisute, Pisan
    ;
    Yuennan, Jureeporn
    ;
    Muensit, Nantakan
    This work focuses on an improvement of dielectric properties of poly(vinylidene fluoride-co-hexafluoropropylene) or P(VDF-HFP) via mixing with different nickel(II) chloride hexahydrate (NiCl<inf>2</inf>⋅6H<inf>2</inf>O) contents (0–2 wt%). The nanocomposite films have been prepared by a conventional solution technique. The results reveal that the surface roughness increases with increasing salt content. The NiCl<inf>2</inf>⋅6H<inf>2</inf>O salt has no significant effect on the crystallinity of films. Additional incorporation of NiCl<inf>2</inf>⋅6H<inf>2</inf>O in the polymer leads to the growing conductivity. However, the considerable enhancement in dielectric constant with the relatively low dielectric loss tangent (0.1–0.3) can be found because of the formation of β-phase nucleation of NiCl<inf>2</inf>⋅6H<inf>2</inf>O in the P(VDF-HFP) matrix. The maximum value of calculated β-phase fraction of the nanocomposite is achieved 86% for salt content 0.5 wt%. Moreover, the largest dielectric constant (29.2 at 10 Hz) of the film doped 2 wt% NiCl<inf>2</inf>⋅6H<inf>2</inf>O is about 7 times greater than that of the pure P(VDF-HFP). The findings in this research suggest that the NiCl<inf>2</inf>⋅6H<inf>2</inf>O/P(VDF-HFP) nanocomposite is a candidate dielectric material for the next generation of energy conversion components.
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    Effect of hydrated salts on the microstructure and phase transformation of poly(vinylidenefluoride-hexafluoropropylene) composites
    (2018-05-01)
    Yuennan, Jureeporn
    ;
    Sukwisute, Pisan
    ;
    Muensit, Nantakan
    The present work has investigated a means of fabricating porous, β phase P(VDF-HFP) film by adding two kinds of hydrated metal salts. Without the use of mechanical stretching or electrical poling treatments, MgCl<inf>2</inf> •6H<inf>2</inf>O and AlCl<inf>3</inf> •6H<inf>2</inf>O are found to induce the formation of β phase crystals in porous film derived from the solution casting method. Trivalent Al ions have been found to effectively promote the self-oriented β phase of the P(VDF-HFP) film greater than divalent Mg ions. The overall β content is achieved about 38% and 42% for adding 0.25 wt% Mg- and Al-salts, respectively. The average pore sizes and surface roughness of porous P(VDF-HFP) films are increased with increasing salt concentration. The dielectric constant of about 5 for pure P(VDF-HFP) film (at 100 Hz) has been boosted up to 13-19 when adding the salts. In addition, the P(VDF-HFP) films filled with Al-salt exhibit the largest piezoelectric coefficient of 20 pC/N. Thus, the modified polymers are one of candidate materials for using in dielectric and piezoelectric applications.