Enhanced electroactive β-phase nucleation and dielectric properties of PVdF-HFP thin films influenced by montmorillonite and Ni(OH)₂ nanoparticle modified montmorillonite

Abstract

Enhancement of β-phase nucleation and dielectric properties of PVdF-HFP films due to incorporation of montmorillonite and Ni(OH)2 nanoparticle modified montmorillonite.

Enhanced dielectric performance and energy storage of PVDF‐HFP‐based composites induced by surface charged Al2O3

“…X C of the composites increased from 19.5 to 32.5% with the increasing GP‐Al 2 O 3 contents, which attributes to the heterogeneous nucleation effect of GP‐Al 2 O 3 . Taking the result of F β into consideration, the active interaction of GP‐Al 2 O 3 with PVDF‐HFP chains could induce the nucleation of β ‐phase PVDF‐HFP . This is due to GP‐Al 2 O 3 with high active energy could provide partial positive charges, rising the opportunity of electronegative fluorine elements near the interface withdrawing toward the side of filler surface, finally induced the nonpolar PVDF‐HFP chains transform into β ‐phase during the crystallization process, thus F β is also increased.…”

Modified sepiolite/PVDF‐HFP composite film with enhanced piezoelectric and dielectric properties

“…The FTIR spectra of pure PVDF‐HFP, 15 wt % SEP/PVDF‐HFP, and 15 wt % LiSEP‐H 2 O/PVDF‐HFP with H 2 O contents of 0, 13, 24, and 30 wt % are shown in Figure (a), which provides the information about the phases of PVDF‐HFP. For the pure PVDF‐HFP film, the absorption peaks at 489 cm −1 (CF 2 waging), 533 cm −1 (CF 2 bending), 615 cm −1 (skeletal bending), 764 cm −1 (CF 2 bending), 795 cm −1 (CH 2 rocking), and 975 cm −1 (twisting) were the peaks of the α‐phase, and the absorbance peaks of the β‐phase were also found at 475 cm −1 (CF 2 deformation), 510 cm −1 (CF 2 stretching), 600 cm −1 (CF 2 waging), and 840 cm −1 (CH 2 rocking, CF 2 stretching, and skeletal CC stretching) . Moreover, the relative fraction of the β‐phase content F(β) in pure PVDF‐HFP, 15 wt % SEP/PVDF‐HFP, and 15 wt % LiSEP‐H 2 O/PVDF‐HFP composite films with different H 2 O contents was calculated by the Lambert–Beer law in eq.…”

“…Moreover, the relative fraction of the β‐phase content F(β) in pure PVDF‐HFP, 15 wt % SEP/PVDF‐HFP, and 15 wt % LiSEP‐H 2 O/PVDF‐HFP composite films with different H 2 O contents was calculated by the Lambert–Beer law in eq. after deducting the FTIR spectra baseline of composite films where A β is the absorbance at 840 cm −1 , and A α is the absorbance at 764 cm −1 .…”

“…In addition, for the dielectric properties of PVDF, ceramics, and graphene oxide were usually used as fillers to further enhance the dielectric properties of pure PVDF. Moreover, the dielectric and piezoelectric properties could be enhanced simultaneously by adding nanoparticles (such as Fe 2 O 3 and Co 3 O 4 ), metallic nanoparticles (such as triturated copper and cobalt), and clay (montmorillonite [MMT]) as fillers in the PVDF‐ co ‐hexafluoropropylene (PVDF‐HFP) matrix.…”

“…Clay minerals, such as MMT, kaolinite, halloysite, attapulgite, palygorskite, and sepiolite (SEP), were widely used as green fillers in polymer matrix in order to enhance the performance of polymer, such as the phase crystallization and electrical properties . For the MMT/PVDF composites reported previously, the piezoelectric and dielectric could be improved at the same time .…”