Improvement of Piezoelectric Property of Poly(Vinylidene Fluoride) Nanocomposites Using Multi-Walled Carbon Nanotubes

2013 ◽  
Vol 392 ◽  
pp. 57-61
Author(s):  
Bin Hu ◽  
Liang Ke Wu ◽  
Hui Ming Ning ◽  
Ning Hu
Keyword(s):  
Piezoelectric Property ◽  
Vinylidene Fluoride ◽  
Nanocomposite Films ◽  
X Ray Diffraction ◽  
Multi Walled Carbon Nanotube ◽  
Poly Vinylidene Fluoride ◽  
Multi Walled Carbon Nanotubes ◽  
Solution Casting Method ◽  
Vibration Tests ◽  
Walled Carbon Nanotubes

We improved the piezoelectric property of poly (vinylidene fluoride) (PVDF) by employing multi-walled carbon nanotube (MWCNT) as nanofillers. The MWCNT/PVDF nanocomposite was prepared by the solution casting method with MWCNT contents ranging from 0.0 wt.% to 0.3 wt.%. To induce the piezoelectric β-phase crystal structure, the nanocomposite films were drawn lengthwise with a ratio of 4 ~ 5 and polarized by step-wise poling method. To evaluate the piezoelectric property, the output voltages of the nanocomposite films were measured through extensive experimental vibration tests. The experimental results show that the nanocomposite films with 0.05 wt.% MWCNT possess the highest output voltage, i.e., around 2 times as that of pure PVDF films. The main reason is that more β-crystalline phase can be formed at this content, as confirmed by X-ray diffraction.

Structures and Physical Properties of Multi-Walled Carbon Nanotube-Filled PVDF Thermoplastic Composites

2007 ◽  
Vol 124-126 ◽  
pp. 1117-1120 ◽  
Author(s):  
Dong Wook Chae ◽  
Young Wan Nam ◽  
Seung Sangh Wang ◽  
S.M. Hong
Keyword(s):  
Carbon Nanotube ◽  
Vinylidene Fluoride ◽  
Thermoplastic Composites ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Loading Level ◽  
Multi Walled Carbon Nanotube ◽  
Poly Vinylidene Fluoride ◽  
Internal Mixer

Poly(vinylidene fluoride) (PVDF) / multi-walled carbon nanotube (MWNT) thermoplastic composites was melt compounded in an internal mixer. The percolation level for this system in electrical conductivity clearly occured between 2 and 2.5 wt%. PVDF/MWNT thermoplastic composites exhibited an increased crystallization temperature with the loading level, at 10 wt% loading by ca. 6. In addition, they presented a shoulder posterior to the main melting peak and an increased endpoint of the peak. In the Wide Angle X-ray Diffraction (WAXD) patterns, the incorporation of MWNT produced a larger shoulder at 2θ =20.7° with increasing the loading level, corresponding to the β-form crystal of PVDF.

Characterization of Polyvinyl Acetate/Multi Walled Carbon Nanotube Nanocomposites

2016 ◽  
Vol 721 ◽  
pp. 13-17
Author(s):  
Juris Bitenieks ◽  
Remo Merijs Meri ◽  
Janis Zicans ◽  
Mārtiņš Kalniņš
Keyword(s):  
Polyvinyl Acetate ◽  
Nanocomposite Films ◽  
Solution Casting ◽  
Casting Technique ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Solution Casting Technique ◽  
Dielectrical Properties ◽  
Walled Carbon Nanotubes

Nanocomposite films from polyvinyl acetate (PVAc) dispersion and multi walled carbon nanotubes (MWCNTs) were prepared by solution casting technique. Stress-strain properties showed increase in elastic modulus and yield strength. Mechanical properties characterized by dynamic mechanical thermal analysis represented increase in storage modulus below glass transition temperature. Studied dielectrical properties of PVAc/MWCNT nanocomposites revealed formation of conductive MWCNT network in PVAc matrix.

A STUDY ON THERMO-OPTIC EFFECT OF β POLY(VINYLIDENE FLUORIDE) THIN FILMS PREPARED BY SOLUTION CASTING METHOD

2008 ◽  
Vol 15 (01n02) ◽  
pp. 175-181 ◽  
Author(s):  
YINGXUE XI ◽  
HUIQING FAN ◽  
WEIGUO LIU ◽  
CHEN YANG ◽  
XIAOLING NIU
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Infrared Imaging ◽  
Vinylidene Fluoride ◽  
Treatment Temperature ◽  
X Ray Diffraction ◽  
Long Wavelength ◽  
Β Phase ◽  
Poly Vinylidene Fluoride ◽  
Solution Casting Method

The Poly(vinylidene) fluoride (PVDF) thin films with a high content of β-phase were prepared by controlling heat-treatment temperature using casting from the poled solvents. The crystallite microstructure of thin films was depicted by the techniques of X-ray diffraction and FTIR. The results showed that heat treatment was favorable for inducing the β- and γ-phase formation of PVDF. The β phase films were obtained with heat treatment at temperatures ranging from 60°C to 120°C and annealing at 120°C after casting from DMF. The thermo-optical effect of β phase PVDF films was investigated using a spectroscopic ellipsometer. At temperatures ranging from 20°C to 100°C, the refractive index of PVDF was negatively correlated with the temperature between 350 and 1500 nm. The value of the t.o. coefficient of PVDF films was calculated at all temperatures. The maximum value of the t.o. coefficient was about 3.3 × 10-4/°C at the ascending stage of temperature and 3.0 × 10-4/°C at the descending stage of temperature. Therefore, it is possible to use the thermo-optic effect of the β phase PVDF for long wavelength infrared imaging.

Enhanced dielectric, ferroelectric, energy storage and mechanical energy harvesting performance of ZnO-PVDF composites induced by MWCNT as an additive third phase

Soft Matter ◽  
2021 ◽  
Author(s):  
Shewli Pratihar ◽  
Aniket Patra ◽  
Abhishek Sasmal ◽  
Samar Kumar Medda ◽  
Shrabanee Sen
Keyword(s):  
Carbon Nanotubes ◽  
Energy Storage ◽  
Energy Harvesting ◽  
Vinylidene Fluoride ◽  
Mechanical Energy ◽  
Third Phase ◽  
Poly Vinylidene Fluoride ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The present work highlights an attempt of fabricating a nanocomposite by addition of multi-walled carbon nanotubes (MWCNT) as third phase into flexible ZnO-Poly(vinylidene fluoride) (ZnO-PVDF) composites. MWCNT played very important...

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