Polarity-induced ferroelectric crystalline phase in electrospun fibers of poly(vinylidene fluoride)/polyacrylonitrile blends

2012 ◽  
Vol 27 (10) ◽  
pp. 1389-1398 ◽  
Author(s):  
Run Su ◽  
Ganji Zhong ◽  
Qiang Fu ◽  
Lifeng Zhang ◽  
Hao Fong ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Vinylidene Fluoride ◽  
Electrospun Fibers ◽  
Poly Vinylidene Fluoride ◽  
Image Position

Abstract

Enhanced β-crystalline phase in poly(vinylidene fluoride) films by polydopamine-coated BaTiO3 nanoparticles

2015 ◽  
Vol 139 ◽  
pp. 212-215 ◽  
Author(s):  
Nan Jia ◽  
Qian Xing ◽  
Guangmei Xia ◽  
Jing Sun ◽  
Rui Song ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Vinylidene Fluoride ◽  
Poly Vinylidene Fluoride ◽  
Batio3 Nanoparticles

Analysis of the crystalline phase transformation of poly(vinylidene fluoride)

1985 ◽  
Vol 18 (12) ◽  
pp. 2583-2587 ◽  
Author(s):  
S. L. Hsu ◽  
F. J. Lu ◽  
D. A. Waldman ◽  
M. Muthukumar
Keyword(s):  
Phase Transformation ◽  
Crystalline Phase ◽  
Vinylidene Fluoride ◽  
Poly Vinylidene Fluoride

scholarly journals Electrostrictive and Structural Properties of Poly(Vinylidene Fluoride-Hexafluoropropylene) Composite Nanofibers Filled with Polyaniline (Emeraldine Base)

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3250
Author(s):  
Nikruesong Tohluebaji ◽  
Chatchai Putson ◽  
Nantakan Muensit ◽  
Jureeporn Yuennan
Keyword(s):  
Dielectric Properties ◽  
Structural Properties ◽  
Crystalline Phase ◽  
Phase Structure ◽  
Composite Nanofibers ◽  
Microelectromechanical Systems ◽  
Vinylidene Fluoride ◽  
Emeraldine Base ◽  
Pani Composite ◽  
Poly Vinylidene Fluoride

Previous studies have reported that poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)) copolymers can exhibit large electrostrictive strains depending on the filler. This work examines the electrostrictive and structural properties of P(VDF-HFP) nanofibers modified with conductive polymer polyaniline (PANI). The P(VDF-HFP)/PANI composite nanofibers were prepared by an electrospinning method with different PANI concentrations (0, 0.5, 1, 1.5, 3 and 5 wt.%). The average diameter, water contact angle and element were analyzed by SEM, WCA and EDX, respectively. The crystalline, phase structure and mechanical properties were investigated by XRD, FTIR and DMA, respectively. The dielectric properties and electrostrictive behavior were also studied. The results demonstrated that the composite nanofibers exhibited uniform fibers without any bead formation, and the WCA decreased with increasing amount of PANI. However, a high dielectric constant and electromechanical response were obtained. The electrostrictive coefficient, crystalline, phase structure, dielectric properties and interfacial charge distributions increased in relation to the PANI content. Moreover, this study indicates that P(VDF-HFP)/PANI composite nanofibers may represent a promising route for obtaining electrostrictive composite nanofibers for actuation applications, microelectromechanical systems and sensors based on electrostrictive phenomena.

Crystalline phase of inorganic montmorillonite/poly(vinylidene fluoride) nanocomposites: influence of dispersion of nanolayers

2017 ◽  
Vol 37 (1) ◽  
pp. 31-41 ◽  
Author(s):  
Chao Fu ◽  
Xuemei Wang ◽  
Xiang Shi ◽  
Xianghai Ran
Keyword(s):  
Thermal Treatment ◽  
Crystalline Phase ◽  
Crystallization Process ◽  
Vinylidene Fluoride ◽  
Polar Phase ◽  
Solution Casting ◽  
Casting Method ◽  
Poly Vinylidene Fluoride ◽  
Solution Casting Method ◽  
Co Precipitation

Abstract Inorganic montmorillonite (MMT)/poly(vinylidene fluoride) nanocomposites were prepared by two methods: co-precipitation and solution casting. The effect of preparation methods and thermal treatment on crystalline phase was investigated by Fourier transform infrared spectroscopy and differential scanning calorimetry tests. The isothermal crystallization process was observed with polarized optical microscopy. It was found that the solution-casting method was more effective than the co-precipitation method in inducing the polar phase in the melt-isothermal crystallization process. The addition of inorganic MMT by the solution-casting method without further thermal treatment promoted the β-phase crystallization. The inorganic MMT significantly improved the γ phase of the solution-cast samples in the melt-recrystallization process. The degree of dispersion of inorganic MMT influenced the relative content of the polar phase and the crystallinity of the samples in the same crystallization conditions, i.e. the preparation method and the thermal treatment. The effect of dispersion on crystallization kinetics was also studied to verify the enhancement of finely dispersed nanolayer clusters on the γ phase.

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