Solid State Extrusion of Poly(vinylidene fluoride). 1. Ram and Hydrostatic Extrusion

Mead, W. T.; Zachariades, Anagnostis E.; Shimada, Taro; Porter, Roger S.

doi:10.1021/ma60069a026

Cited by 40 publications

(23 citation statements)

References 9 publications

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“…The actual increase of Ell starts after 3, = 4 [143]. The sorption 8 and permeability P = 8D of small molecules of CH4, Ar, N2, and O2 up to3, between 3 and 4, increase with 3, and then drop rapidly as expected.…”

Section: -~V ~ Ecll Fl"supporting

confidence: 63%

“…The situation is similar but not so drastic in low density PE (LDPE) [97] and in iPP [138]. Besides PE different other semicrystalline polymers have been investigated such as iPP [79,138,139], POM [140,141], polyvinylalcohol (PVA) [48], poly(tetrafluoroethylene) (PTFE) [142], poly(vinylidene fluoride) (PVF2) [143][144][145], poly(buthenel) (PB1) [146], iPS [147][148][149][150][151], polyethylene terephthalate (PET) [84,152], polyamides [1,50,51,80,153], poly(vinylchloride) (PVC) [154], and poly(acrylonitril) [155,156].…”

Section: Experimental Datamentioning

confidence: 99%

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Drawing and extrusion of semi-crystalline polymers

Peterlin

1987

Colloid & Polymer Sci

244

194

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This review treats mainly the initial transformation of the starting unoriented lamellar material into the final oriented microfibrillar structure and its drawing. If the starting material has partially oriented shish-kebab structure the drawing is a combination of transformation of lamellae into the microfibrils and the drawing of microfibrils. The review artide is based on the literature from the last ten years and relys heavily on recent reviewing [1][2][3]. Older articles are only included if they have contributed to the basic ideas and experiments of drawing.

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Section: -~V ~ Ecll Fl"supporting

confidence: 63%

Section: Experimental Datamentioning

confidence: 99%

Drawing and extrusion of semi-crystalline polymers

Peterlin

1987

Colloid & Polymer Sci

244

194

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“…In this connection, one should mention a series of studies 145~147 in which this technique was used to obtain oriented PVDF films. The extrusion conditions selected by Mead et al 146 corresponded to a pressure of 0.23 GPa in the extruder and a temperature of 160 °C. The change in melting point corresponding to a pressure change of 1 Pa is 3.3 degree.…”

Section: Characteristics Of the Solid-state Transformations Undermentioning

confidence: 99%

The structure and properties of block poly(vinylidene fluoride) and systems based on it

1996

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“…Where Xc, Hfeare degree of crystallinity, fusion enthalpy of the sample PVDF and H*feis fusion enthalpy with 100% crystallinity, which is 102.5 J/g given in [27]. Fraction of βp-phase crystals F (βp) in each sample is calculated by:…”

Section: Characterization and Electrical Response Of Proposed Samplementioning

confidence: 99%

Use of Flat Ribbon like Electrode Geometry to Pole PVDF Piezoelectrics in Solution Processing

Kodali¹

2019

IJEAT

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We study how ribbons of fluids subjected to electric fields can serve applications in energy harvesting. In particular the emphasis is on how the geometry (i.e. 2-D ribbons) can influence functionality. For applications related to energy harvesting, we consider the use of polymer Piezo-electric PolyvinylideneFluoride (PVDF). Corona poling, photo-induced, photo-thermal and electron beam poling are the different conventional techniques used for PVDF poling. The parallel plate capacitor structure made for poling the PVDF material while the PVDF is being cured. One key advantage of preparing PVDF is the ability of solution processing. Normally, the liquid is then spin coated on a substrate and left to dry. Either during the process of spin coating, or after drying - the film of PVDF is poled so as to align the dipoles and make a piezoelectric. We propose the use of a metal-insulator ribbon like electrode geometry to combine the process of fabrication and poling thereby making the process more efficient. On the application of a voltage across the electrodes, the voltage of Vs is developed across the fluid. This result in a field of Vs/d across the PVDF fills aiding the process of poling while the film is in liquid phase. Therefore the ribbon like geometry aids the use of PVDF piezo-electrics in two ways. Firstly, it makes the fabrication process efficient by combining the poling with the structure development. Secondly, the control of width (w) and length (l) aids the setup of the PVDF piezoelectric resonant frequency for a given thickness (d). This helps match the resonant frequency of the ribbon with the incoming low frequency vibration to improve the energy harvesting levels. Piezo-electrics can be used in submerged applications, large area PVDF energy scavengers, mechanical filters and sensors, rural electrification, and charging circuits for hand-held devices.

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Solid State Extrusion of Poly(vinylidene fluoride). 1. Ram and Hydrostatic Extrusion

Cited by 40 publications

References 9 publications

Drawing and extrusion of semi-crystalline polymers

Drawing and extrusion of semi-crystalline polymers

The structure and properties of block poly(vinylidene fluoride) and systems based on it

Use of Flat Ribbon like Electrode Geometry to Pole PVDF Piezoelectrics in Solution Processing

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