The effects of nanofillers, stretching and recrystallization on microstructure, phase transformation and dielectric properties in PVDF nanocomposites

Tang, Chih-Wen; Li, Bin; Sun, Lili; Lively, Brooks; Zhong, Wei‐Hong

doi:10.1016/j.eurpolymj.2012.04.002

Cited by 128 publications

(71 citation statements)

References 44 publications

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“…Relatively recent studies about PVDF/CNT nanocomposites indicate that when adding CNT to PVDF, α‐phase to β‐phase crystal transformation can be induced. Besides, CNT may act as nucleating agents of PVDF exerting a crystallization confinement that depends on its concentration . However, a clear origin of those changes is not revealed yet, being the answer to that question even more difficult when a second filler is incorporated within the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

PVDFBaTiO₃/carbon nanotubes ternary nanocomposites: Effect of nanofillers and processing

Sanchez

González‐Benito

2015

Polymer Composites

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Ternary thermoplastic systems based on poly(vinylidene fluoride), PVDF, filled with barium titanate, BaTiO3, submicrometric particles and carbon nanotubes, CNT, were prepared. Their structure and morphology were studied as a function of composition and finally correlated with thermal and mechanical properties. High energy ball milling, HEBM, under cryogenic conditions and subsequent hot pressing were used to obtain films with quite uniform dispersion of the nanofillers. The presence of BaTiO3 particles and CNT did not modify the thermodegradation mechanism of the PVDF. However, enough amount of BaTiO3 seemed to inhibit the volatility of the products of pyrolysis, hindering the decomposition of PVDF. The presence of CNT favored the PVDF thermodegradation probably due to improved heat transmission by an increase in the thermal conductivity. Variations in PVDF thermal transitions were more dependent of processing conditions. Improvements in the mechanical properties of PVDF were ascribed to a reinforcing effect of the fillers. This effect only happened below the fraction of percolation of CNT, pointing out that CNT reinforce through an optimum load transfer from the PVDF matrix to the nanofillers. POLYM. COMPOS., 38:227–235, 2017. © 2015 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

PVDFBaTiO₃/carbon nanotubes ternary nanocomposites: Effect of nanofillers and processing

Sanchez

González‐Benito

2015

Polymer Composites

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“…The dielectric constant for LSMO-BTO nanocomposites increases significantly with BTO content, presumably due to the Maxwell-Wagner-type contribution to the dielectric constant. 15 The enhancement in dielectric properties of LSMO-BTO composites is attributed to the interfacial polarization arising from BTO filler particles acting as trapping centers 16 and in dissipation factor is due to metallic nature of LSMO nanoparticles. However, the dielectric constant and the dissipation factor (inset of Fig.…”

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confidence: 99%

Magneto-dielectric coupling and transport properties of the ferromagnetic-BaTiO3 composites

Kumar

Shankar

Dwivedi

et al. 2015

Applied Physics Letters

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Ferromagnetic and large magnetoresistance (MR) nanocomposites of La 0.67 Sr 0.33 MnO 3 -BaTiO 3 (LSMO-BTO) are synthesized via sol-gel route. The X-ray diffraction confirms the existence of two chemically separated phases in the composites. The maximum MR (35%) was achieved in LSMO-5% BTO (LB5). The coupling between the coexisting phases is observed from the dielectric anomaly at the ferromagnetic transition (T c ¼ 353 K) for LB5 composition. We observed maximum magnetodielectric effect at T c of 1.18% in magnitude for LB5 and the effect of magnetic field on other composites was significant. These results are related to the large spin polarization within grains as well as at the grain boundaries and the evidence of variation in dielectric parameters with magnetic field reveal the magnetoelectric coupling in LSMO-BTO nanocomposites. V C 2015 AIP Publishing LLC. [http://dx.

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“…Peaks at 490, 530, 612, 677, 763, 796, 970, 1076, 1210, 1383, and 1430 cm -1 are the footprints of α-phase, where vibration bands at 530 cm −1 stands for CF 2 bending, 612 and 763 cm −1 for CF 2 bending and skeletal bending, and 970 cm −1 for CH 2 rocking [39,40]. The peaks at 510, 840, and 1275-1279 cm -1 are fingerprints of β-phase, where vibration bands at 510 cm −1 due to CF 2 bending and 840 cm −1 due to CH 2 rocking correspond to β-phase [41,42]. Shifting of β-phase (840 cm −1 ) toward 833 cm −1 indicates the formation of γ-phase content [43,44].…”

Section: Ftir Analysismentioning

confidence: 98%

“…Sudden improvement in dielectric properties at a particular frequency can be seen, which is due to the effect of good dispersion of nickeldoped mullite in polymer matrix. During the procedure, charges become entrapped in the interface between PVDF and doped mullite composite [42].…”

Section: Analysis Of Dielectric Constantmentioning

confidence: 99%

Influence of nickel ion-doped mullite composite on electrical properties, phase behavior, and microstructure of poly(vinylidene fluoride) matrix

et al. 2016

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Novel mullite-polymer composite films were prepared by incorporating highly crystallized nickel ion-doped mullite, which acts as filler into polyvinylidene matrix. Various analytical tools had been utilized at room temperature to study the effects of filler on microstructure, phase transformation, and electrical properties of the polymer films. X-ray diffraction spectra (XRD) and Fourier transform infrared spectroscopy (FTIR) confirm the changes of electroactive phase in polyvinylidene fluoride (PVDF) matrix. Two basic factors, which affected the phase transition of the polymer, were (i) the concentration of the dopant ion into the mullite and (ii) the temperature at which doped mullite were sintered. β-phase percentage of doped polymer was found to reach optimum level for the sample doped with nickel ion at concentration of 0.8 M, when sintered at both 1100 and 1400°C. Electrical properties were studied over a wide range of frequency (from 200 Hz to 2.0 MHz). The composite film showed maximum dielectric constant of 35.77, at 200 Hz for 1.2 M concentration of nickel ion-doped mullite sintered at 1400°C, compared to 9.10, for the pure polymer. Furthermore, both dielectric constant and electrical conductivity of the composite were also highly dependent upon dopant concentration inside filler and frequency of the AC field. The AC conductivity of the developed composite increased with an increase in temperature by following Jonscher's power law, while the electrical resistivity reduced accordingly. Field emission scanning electron microscope (FESEM) characterization study showed the uniform distribution of doped mullite embedded inside the polymer matrix. Moreover, the results reflected that this novel composite material is able to follow the galloping pace of development of the smaller electronic devices, which are highly indebted to the development of very small size (microlevel/ nanolevel) as well as efficient new-generation semiconductor materials.

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The effects of nanofillers, stretching and recrystallization on microstructure, phase transformation and dielectric properties in PVDF nanocomposites

Cited by 128 publications

References 44 publications

PVDFBaTiO₃/carbon nanotubes ternary nanocomposites: Effect of nanofillers and processing

PVDFBaTiO₃/carbon nanotubes ternary nanocomposites: Effect of nanofillers and processing

Magneto-dielectric coupling and transport properties of the ferromagnetic-BaTiO3 composites

Influence of nickel ion-doped mullite composite on electrical properties, phase behavior, and microstructure of poly(vinylidene fluoride) matrix

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The effects of nanofillers, stretching and recrystallization on microstructure, phase transformation and dielectric properties in PVDF nanocomposites

Cited by 128 publications

References 44 publications

PVDFBaTiO3/carbon nanotubes ternary nanocomposites: Effect of nanofillers and processing

PVDFBaTiO3/carbon nanotubes ternary nanocomposites: Effect of nanofillers and processing

Magneto-dielectric coupling and transport properties of the ferromagnetic-BaTiO3 composites

Influence of nickel ion-doped mullite composite on electrical properties, phase behavior, and microstructure of poly(vinylidene fluoride) matrix

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PVDFBaTiO₃/carbon nanotubes ternary nanocomposites: Effect of nanofillers and processing

PVDFBaTiO₃/carbon nanotubes ternary nanocomposites: Effect of nanofillers and processing