Polymer ferroelectret based on polypropylene foam: piezoelectric properties prediction using dynamic mechanical analysis

Mohebbi, Abolfazl; Mighri, Frej; Ajji, Abdellah; Rodrigue, Denis

doi:10.1002/pat.3908

Cited by 19 publications

(22 citation statements)

References 57 publications

(113 reference statements)

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“…On the one hand, polymer dielectrics with air cavities can accumulate a quasi-remanent polarization with relatively low charge density up to approximately 0.1 µC/cm 2 22 , 27 , 37 – 39 , 46 significantly lower than the typical values for classical bulk ferroelectric polymers (5–15 µC/cm 2 ) 7 , 47 and conventional piezoceramics (10–100 µC/cm 2 ) 6 , 48 , 49 . But on the other hand, ferroelectrets, like all porous polymers 1 , 50 , have an extremely low Young modulus ranging from 0.2 MPa to 10 MPa, depending on the mechanical properties of the polymer matrix and the pore geometry 10 , 22 , 30 , 33 , 44 , 51 .…”

Section: Resultsmentioning

confidence: 99%

Analytical prediction of the piezoelectric d33 response of fluoropolymer arrays with tubular air channels

Zhukov

Eder-Goy

Fedosov

et al. 2018

Sci Rep

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The present study is focused on tubular multi-channel arrays composed of commercial fluoropolymer (FEP) tubes with different wall thickness. After proper charging in a high electric field, such tubular structures exhibit a large piezoelectric coefficient significantly exceeding the values of classical polymer ferroelectrics and being even comparable to conventional lead-free piezoceramics. The quasistatic piezoelectric coefficient was theoretically derived and its upper limits were evaluated considering charging and mechanical properties of the arrays. In order to optimize the coefficient the remanent polarization and the mechanical properties were taken into account, both being strongly dependent on the air channel geometry as well as on the wall thickness of the FEP tubes. The model predictions are compared with experimental d33 coefficients for two particular arrays with equal air gaps of 250 μm, but with different wall thickness of utilized FEP tubes of 50 μm and 120 μm, respectively. Analytical modeling allows for the prediction that arrays made of FEP tubes with a wall thickness of 10 μm are foreseen to exhibit a superb piezoelectric response of up to 600 pC/N if the height of stadium-like shaped air channels is reduced down to 50 μm, making them potentially interesting for application as highly sensitive sensors and energy harvesting.

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Section: Resultsmentioning

confidence: 99%

Analytical prediction of the piezoelectric d33 response of fluoropolymer arrays with tubular air channels

Zhukov

Eder-Goy

Fedosov

et al. 2018

Sci Rep

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“…This charging voltage stabilizes from a certain needle‐sample distance (4 cm in our case). However, the piezoelectric coefficient decreases at higher needle‐sample distance because nonuniform corona charging occurs over the whole film surface at large distances …”

Section: Resultsmentioning

confidence: 99%

“…The method consists of imposing a potential difference between a needle and a conductive plate to create an electric field over the entire width. Parameters such as voltage, needle distance, and charging time are important to improve the charging effect …”

Section: Introductionmentioning

confidence: 99%

“…Parameters such as voltage, needle distance, and charging time are important to improve the charging effect. 25 Another important parameter affecting the piezoelectric response is the elastic behavior of the film, mainly the elastic stiffness (c 33 ) in the surface-normal direction (thickness direction). The literature shows that the piezoelectric d 33 coefficient has a maximum when the elastic modulus (c 33 ) exhibits a minimum.…”

Section: Introductionmentioning

confidence: 99%

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Piezoelectric property improvement of polyethylene ferroelectrets using postprocessing thermal‐pressure treatment

Hamdi

Mighri

Rodrigue

2018

Polymers for Advanced Techs

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In this work, biaxially stretched polymer foams with well‐defined cellular structures were prepared from polyethylene via blown‐film extrusion and subjected to corona charging to produce a piezoelectric response. The charging parameters were first optimized in terms of charging voltage and needle distance, as well as the gas type and pressure to investigate their effect on the piezoelectric coefficient (d33). The results show that samples charged under nitrogen (N2) at 100 kPa had better d33 coefficient than those charged under ambient air or N2 at 20 kPa. Moreover, 2 different thermal pressure treatments were imposed to obtain an optimized eye‐like cellular structure with different cell aspect ratios (AR). The results showed that when the cells were elongated in both the longitudinal and transverse directions (higher AR), higher d33 coefficients were achieved. From all the samples produced, the best results were obtained for a longitudinal aspect ratio (AR‐L) of 7.1, a transversal aspect ratio (AR‐T) of 4.6, and a relative foam density of 0.52 leading to a d33 coefficient of 935 pC/N. This coefficient was further increased using reverse charging and multilayered films, reaching a maximum of 2550 pC/N. This value is much higher than typical ones reported so far for any polyethylene and polypropylene ferroelectrets. These results could increase the use of polyethylene in piezoelectric applications as these materials are very attractive for the large‐scale production of electret‐based sensors and transducers due to their low cost and easy processing.

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“…DMA results showed that for all the foamed samples the storage ( E′ ) and loss ( E″ ) moduli in the L direction are higher than for the T direction, which confirms the presence of elongated cells in the L direction. Moreover, as discussed in our previous work , two parameters called anisotropic modulus ratio (AMR) can be used to quantify this effect:

AMR 1 = E^{'} true(L true) / E^{'} (T)

and

AMR 2 = E ″ true(L true) / E ″ (T)

…”

Section: Resultsmentioning

confidence: 99%

Energy absorption capacity of ferroelectrets based on porous polypropylene

Mohebbi

Rodrigue

2017

Polymer Engineering & Sci

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Ferroelectret materials are special group of piezoelectric materials obtained from the cellular structure of nonpolar polymers. They are under investigation for a variety of applications such as actuators, vibration control, speakers, microphones, sensors, as well as healthcare monitoring systems. In this work, the effect of morphological and mechanical properties of ferroelectret films on their capacitance and stored energy capacity was studied. Different eye‐like cellular structure of porous polypropylene films with different cell aspect ratio (AR) and mechanical properties were used. The optimized sample was obtained with AR = 6.6 using nitrogen (N2) as the ionizing gas to give a quasi‐static piezoelectric coefficient (d33) of about 800 pC/N, an electrode charge density of about 2.10 mC/m2, a maximum capacitance of about 465 pF, as well as a maximum stored energy capacity of about 1,824 pJ. It was observed that replacing air with N2 as the ionizing gas led to an increase in charge/voltage output. Moreover, by replacing air with N2 as the ionizing gas, the capacitance and stored energy of the samples were improved by about 20% and 80%, respectively. Hence, it can be concluded that the capacitance was mostly related to the cellular morphology of the samples while the stored energy was also function of the ionizing gas used. POLYM. ENG. SCI., 58:300–309, 2018. © 2017 Society of Plastics Engineers

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Polymer ferroelectret based on polypropylene foam: piezoelectric properties prediction using dynamic mechanical analysis

Cited by 19 publications

References 57 publications

Analytical prediction of the piezoelectric d33 response of fluoropolymer arrays with tubular air channels

Analytical prediction of the piezoelectric d33 response of fluoropolymer arrays with tubular air channels

Piezoelectric property improvement of polyethylene ferroelectrets using postprocessing thermal‐pressure treatment

Energy absorption capacity of ferroelectrets based on porous polypropylene

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