Results 271 to 280 of about 307,273 (315)

Piezoelectricity of PVDF/PUE, PVDF/PMMA and PVDF/(PMMA+BaTiO/sub 3/) laminates

[1991 Proceedings] 7th International Symposium on Electrets (ISE 7), 1992
The author suggests the preparation of piezoelectric laminates using PVDF (polyvinylidene fluoride) polymer film (a), polyester urethane elastomer (PUE) film (b), PMMA (polymethyl methacrylate) film (c), and (PMMA+BaTiO/sub 3/) composite film (d).
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Curved PVDF airborne transducer

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 1999
In the application of airborne ultrasonic ranging measurement, a partially cylindrical (curved) PVDF transducer can effectively couple ultrasound into the air and generate strong sound pressure. Because of its geometrical features, the ultrasound beam angles of a curved PVDF transducer can be unsymmetrical (i.e., broad horizontally and narrow ...
H, Wang, M, Toda
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A Succinct Review on Piezoelectric Characteristics of PVDF and its Copolymer PVDF-HFP

ECS Transactions, 2022
Researchers are making attempts to develop a lightweight, shock resistance, portable, wireless sensors, and flexible wearable electronic devices. Piezoelectric nanogenerators are those which are used to convert mechanical into electrical energy and vice versa, which in turn meets the requirement of low-powered electronic gadgets.
Ashwini Chavan V M, Shireesha G, Ambika M R   +2 more
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Ultrasonic transducers using PVDF

Ferroelectrics, 1991
In a research program on ultrasonic transducers. PVDF has been used for structures needing thinness, flexibility and low acoustic impedance. The specific applications described include focused conical transducers for NDT, array transducers for medical holographic B-scan imaging and transmitters/ receivers for zetapotential measurements in colloidal ...
Jussila, Salme, Stubb, Henrik, Pitkänen, Jorma, Lahdenperä, Kari, Penttinen, Auvo, Suorsa, Veijo, Tauriainen, Antti   +7 more
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Adhesion and morphology of PVDF/PMMA and compatibilized PVDF/PS interfaces

Polymer, 1991
Abstract The morphology of the interface between miscible and immiscible polymer pairs was investigated. For the PVDF/PMMA system, which has a highly exothermic enthalpy of mixing, complex structures suggest the occurrence of bulk convective motion at the contact area between the two polymer melts.
D.Freitas Siqueira, F. Galembeck, S.Pereira Nunes   +2 more
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Confined crystallization of PVDF and a PVDF‐TFE copolymer in nanolayered films

Journal of Polymer Science Part B: Polymer Physics, 2011
AbstractLayer‐multiplying coextrusion was used in conjunction with isothermal recrystallization to study the confined crystallization of polyvinylidene fluoride (PVDF) and polyvinylidene fluoride‐tetrafluoroethylene (PVDF‐TFE) using polycarbonate (PC) and polysulfone (PSF) as confining materials.
Matt Mackey, Lionel Flandin, Anne Hiltner, Eric Baer   +3 more
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Membranes from Blended Ionomer/PVDF Nanofibers:  I. PFSA/PVDF and PFIA/PVDF Fiber Spinning and Membrane Fabrication

ECS Meeting Abstracts, 2015
Blends and composites of various perfluoroionomers and uncharged polymers, e.g., poly(vinylidene fluoride) (PVDF), have been widely studied as the proton conducting membrane material for direct methanol and hydrogen/air fuel cells. The general idea of blending was to decouple the mechanical and swelling properties of a membrane from its proton ...
Dos Santos, L., Park, Jun Woo, Wycisk, Ryszard, Pintauro, Peter N, Nawn, Graeme, VEZZU', KETI, NEGRO, ENRICO, BERTASI, FEDERICO, DI NOTO, VITO   +8 more
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Some features of the electric relaxation in PVDF and PVDF-PZT composites

Proceedings of 8th International Symposium on Electrets (ISE 8), 2002
It is shown that relaxation of the residual polarization in PVDF can be caused by spontaneous switching of a portion of the polarized volume to its initial electric state. The phenomenon is observed as Barkhausen's pulses. The duration of the pulse, the magnitude of a leap, and the switched volume per pulse are calculated.
A.E. Sergeeva, S.N. Fedosov, P. Pissis
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Toward Antibiofouling PVDF Membranes

Langmuir, 2019
Membranes for biologically and biomedically related applications must be bioinert, that is, resist biofouling by proteins, human cells, bacteria, algae, etc. Hydrophobic materials such as polysulfone, polypropylene, or poly(vinylidene fluoride) (PVDF) are often chosen as matrix materials but their hydrophobicity make them prone to biofouling, which in ...
Chen-Hua Hsu, Antoine Venault, Yu-Tzu Huang, Bo-Wei Wu, Chung-Jung Chou, Kazuhiko Ishihara, Yung Chang   +6 more
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Impact of nucleating agents of PVDF on the crystallization of PVDF/PMMA blends

Polymer, 2001
Abstract The enhanced nucleation of poly(vinylidene fluoride) in its blends with PMMA, and its impact on the crystallization kinetics and overall crystallinity of the PVDF/PMMA blends are investigated. Since in the blends the growth rates are significantly slowed down and spread over a wider crystallization range, nucleation has a significant impact ...
S Schneider, X Drujon, J.C Wittmann, B Lotz   +3 more
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