Correlation between nucleation, phase transition and dynamic melt-crystallization kinetics in PAni/PVDF blends

Biswas, Swarup; Dutta, Biswajit; Bhattacharya, Subhratanu

doi:10.1039/c5ra15989j

Cited by 30 publications

(22 citation statements)

References 48 publications

(70 reference statements)

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“…This shift is due to the rearrangement of PVDF crystals that leads to the formation of the β‐phase. X c decreases for PNF, PPNF, PHNF, and BNCNF mats when compared with that of pristine PVDF film, which is in line with the WAXD results . Difference in X c obtained from DSC and WAXD analysis is due to the inevitable error which may happen due to the baseline correction carried out during the analysis and also with the separation of crystalline and amorphous phase in WAXD .…”

Section: Resultssupporting

confidence: 84%

Durable, efficient, and flexible piezoelectric nanogenerator from electrospun PANi/HNT/PVDF blend nanocomposite

2018

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Currently, there is considerable research focus on portable, lightweight, shock‐resistant, and inexpensive wearable devices that are ideally powered by harvesting abundant mechanical or vibration energy, making battery or related wiring superfluous. In this study, piezoelectric nanogenerator was electrospun from PANi (polyaniline)/HNT (halloysite nanotube)/PVDF (poly[vinylidene fluoride]) blend nanocomposite. Polymorphism, crystallinity and morphology of the nanogenerator were explored in detail. HNT and PANi acted as a nucleating agent and conductive filler, respectively in PVDF; their synergism helps improve the piezoelectric performance of PVDF. The piezoelectric performance of the nanogenerator patch was studied under various external mechanical stresses, such as pressure, tapping, and impact. A maximum voltage output of approximately 7.2 V was generated by the nanogenerator under impact. The nanogenerator patch attached to human arm exhibited not only excellent piezoelectric response during arm movements, but, also proved to be flexible, highly sensitive and durable. This nanogenerator could possibly be used in wearable piezoelectric energy conversion application for self‐powered devices. POLYM. COMPOS., 40:1663–1675, 2019. © 2018 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 84%

Durable, efficient, and flexible piezoelectric nanogenerator from electrospun PANi/HNT/PVDF blend nanocomposite

2018

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“…This semicrystalline polymer has a complex structure with the constitutional repeating unit [CH 2 CF 2 ]. Based on the chain conformation, PVDF can exhibit five different crystalline phases, among which β phase with all trans (TTTT) planar zigzag, α phase with TGTG′ (trans‐gauche‐trans‐gauche) and γ phase with T 3 GT 3 G′ are the important phases from the practical point of view …”

Section: Introductionmentioning

confidence: 99%

Enhanced electroactive β phase in three phase PVDF/CaCO₃/nanoclay composites: Effect of micro‐CaCO₃ and uniaxial stretching

Jahan

Mighri

Rodrigue

et al. 2017

J of Applied Polymer Sci

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In this study, electroactive polar phase transformation and crystallinity of poly(vinylidene fluoride) (PVDF)-based composites, such as PVDF/CaCO 3 /nanoclay, is explored as a function of micro-CaCO 3 fraction and draw ratio (R) of uniaxial stretching. Composites including PVDF/clay, PVDF/CaCO 3 and most importantly PVDF/CaCO 3 /clay with varying fraction of micro-CaCO 3 were extruded into homogenous and flexible cast films. Characterization via Fourier transform infrared spectroscopy, X-ray diffraction, and differential scanning calorimetry (DSC) confirmed the presence of b phase in all the composites incorporated with micro-CaCO 3 and nanoclay either individually (i.e., PVDF/CaCO 3 and PVDF/clay films, respectively) or together (i.e., PVDF/CaCO 3 /nanoclay composites). Interestingly, a gradual but significant improvement in this electroactive phase (b phase) was obtained with successive increment in CaCO 3 content into a fixed composition of PVDF and nanoclay (PVDF/CaCO 3 /clay composites). Further increment in b phase content was obtained via uniaxial stretching to different draw ratios and at a temperature of 90 8C, where for PVDF/CaCO 3 / clay (especially, 100-35-3 and 100-40-3) samples almost no a phase was observed irrespective of R. Conversely, the crystallinity of melt extruded samples decreased gradually all the way with CaCO 3 concentration in PVDF/CaCO 3 /clay composites compared to the neat PVDF while increased gradually with increasing draw ratio.

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“…Although the β‐phase holds the thermodynamically most stable zigzag conformation with spontaneous alignment of C − F dipoles perpendicular to the c ‐axis in the crystalline region, PVDF commonly forms α‐phase crystals containing solidified antiparallel dipoles at ambient temperatures, which are bad for its ferroelectric performance. Such a situation can be changed by employing uniaxial stretching, an electric poling field, nucleation substrate, high pressure, nano‐droplets or nano‐clay composites to generate a high content of β‐phase for good ferroelectric performance.…”

Section: Introductionmentioning

confidence: 99%

Primary and secondary crystallization of fast-cooled poly(vinylidene fluoride) studied by Flash DSC, wide-angle X-ray diffraction and Fourier transform infrared spectroscopy

Chen

Shen

2016

Polym. Int.

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Correlation between nucleation, phase transition and dynamic melt-crystallization kinetics in PAni/PVDF blends

Abstract: The dynamic melt crystallization kinetics of polyaniline (PAni)/poly(vinylidene fluoride) (PVDF) blends of different compositions has been investigated to understand the influence of PAni on the heterogeneous nucleation and phase transition of PVDF.

Cited by 30 publications

References 48 publications

Durable, efficient, and flexible piezoelectric nanogenerator from electrospun PANi/HNT/PVDF blend nanocomposite

Durable, efficient, and flexible piezoelectric nanogenerator from electrospun PANi/HNT/PVDF blend nanocomposite

Enhanced electroactive β phase in three phase PVDF/CaCO₃/nanoclay composites: Effect of micro‐CaCO₃ and uniaxial stretching

Primary and secondary crystallization of fast-cooled poly(vinylidene fluoride) studied by Flash DSC, wide-angle X-ray diffraction and Fourier transform infrared spectroscopy

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Correlation between nucleation, phase transition and dynamic melt-crystallization kinetics in PAni/PVDF blends

Abstract: The dynamic melt crystallization kinetics of polyaniline (PAni)/poly(vinylidene fluoride) (PVDF) blends of different compositions has been investigated to understand the influence of PAni on the heterogeneous nucleation and phase transition of PVDF.

Cited by 30 publications

References 48 publications

Durable, efficient, and flexible piezoelectric nanogenerator from electrospun PANi/HNT/PVDF blend nanocomposite

Durable, efficient, and flexible piezoelectric nanogenerator from electrospun PANi/HNT/PVDF blend nanocomposite

Enhanced electroactive β phase in three phase PVDF/CaCO3/nanoclay composites: Effect of micro‐CaCO3 and uniaxial stretching

Primary and secondary crystallization of fast-cooled poly(vinylidene fluoride) studied by Flash DSC, wide-angle X-ray diffraction and Fourier transform infrared spectroscopy

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Enhanced electroactive β phase in three phase PVDF/CaCO₃/nanoclay composites: Effect of micro‐CaCO₃ and uniaxial stretching