Effect of poly(methyl methacrylate) addition on the dielectric and energy storage properties of poly(vinylidene fluoride)

Abstract

Poly(methyl methacrylate) (PMMA) was introduced into poly(vinylidene fluoride) (PVDF) via a solution blending process, and a series of PVDF/PMMA blends were obtained in an effort to reduce the energy loss of pure PVDF. The effects of the composition and thermal treatment on the properties of the polymer blends were carefully studied. The results show that the introduction of PMMA led to a lower crystallinity and a smaller crystal size of PVDF for its dilution effect. As a result, the dielectric constant and energy storage density of the polymer blends were slightly reduced. Meanwhile, the phase transition of the PVDF crystals from the a phase to the b phase happened during the quenching of the blend melt to ice-water; this was also observed in the untreated or annealed blends with PMMA contents over 50 wt %. Compared with the a-PVDF, the PVDF crystals in the b phase possessed a lower melting temperature, a higher dielectric constant, and a lower dielectric loss. The addition of PMMA reduced the energy loss of PVDF significantly, whereas the energy storage density decreased slightly. The optimized blend film with about 40 wt % PMMA and PVDF in the b phase showed a relative high energy storage density and the lowest energy loss.

Structure change and energy storage property of poly(vinylidene fluoride-hexafluoropropylene)/poly (methyl methacrylate) blends

“…The DSC analysis results show the general reduction in crystallinity, indicating that the absolute ratio of alpha and beta deceases while the percent of gamma rising. Similar conclusion was drawn by Zhicheng Zhang for P(VDF TrFE) polymer blends [16].…”

“…The peaks at 840 and 1278 cm -1 are assigned to the β phase of P(VDF HFP) [14][15][16] which overlap with the absorption of PMMA, so that they can not be used to quantify the content change of beta phase. Figure 2 shows the XRD spectra of biaxial oriented P(VDF HFP)/PMMA blend films.…”

High breakdown strength and low loss binary polymer blends of poly(vinylidene fluoride‐trifluoroethylene‐chlorofluoroethylene) and poly(methyl methacrylate)

“…Although the same energy density or even high energy density has been achieved in other reported PMMA modified ferroelectric polymer systems like PVDF/PMMA blend, P(VDF‐TrFE)/PMMA blend, P(VDF‐TrFE‐CTFE)‐grafted‐PMMA, and so on, the charge‐discharge efficiency is usually below 90%. The high efficiency in this work is among the highest lever compared with literature results shown in Table .…”

Crystallization behaviors of poly(vinylidene fluoride) and poly(methyl methacrylate)-block-poly(2-vinyl pyridine) block copolymer blends

“…The crystalline phase of PVDF could not be changed by PMMA but could be changed by the addition of P2VP [21,22]. Besides, Meng et al [23] found that with the increase of PMMA content, the phase of PVDF in the polymer blends could transfer from a-PVDF to b-PVDF. For the study of PVDF/SAN/PMMA ternary blend, it was found that the inclusion of PMMA could confine the movement of PVDF chains and reduce the lamella thickness and the degree of crystallinity [24].…”