Ferroelectrics

Jang, S. J.

doi:10.1002/0471238961.0605181810011407.a01

Cited by 2 publications

(1 citation statement)

References 75 publications

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“…Lenz-Ising models [56][57][58][59] of dipolar systems and the present model can be viewed as a complicated version of a Lenz-Ising model. What is of specific interest in the present polar polyethylene simulations is the time-domain progression of polarization reversal response as a function of applied electric field and temperature, and the comparison and contrast to the initial polarization response.…”

Section: Full Papermentioning

confidence: 99%

Molecular dynamic study of dielectric polarization and ferroelectricity in a model polar polymer

Calame

2015

J Polym Sci B Polym Phys

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Molecular dynamics simulations are used to explore the polarization response of a lamellar crystal consisting of folded chains of a highly simplified model polar polymer. The system is based on a united atom model of polyethylene with constrained bond lengths and bond angles, and it is endowed with artificial partial charges placed on the united atoms to give it a simple polar character. Simulations performed with various temperatures, electric field directions, and electric field application histories reveal a complicated sequence of reorientation processes, including pronounced ferroelectric behavior. The sequence includes a weak, temperature‐independent prompt response, and a slow‐rising delay regime with stretched exponential behavior and thermally‐activated reorientation parameters consistent with trans‐gauche (TG) barrier crossings in the amorphous phase. When the delay regime has progressed sufficiently, a primary large‐amplitude response due to organized rotation of large subsegments in the crystalline phase occurs in a rapid manner that requires relatively few TG barrier crossings. A final, extremely slow rise in residual polarization completes the sequence. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 740–759

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Section: Full Papermentioning

confidence: 99%

Molecular dynamic study of dielectric polarization and ferroelectricity in a model polar polymer

Calame

2015

J Polym Sci B Polym Phys

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Piezoelectric Melt-Spun Textile Fibers: Technological Overview

Matsouka¹,

Vassiliadis²

2018

Piezoelectricity - Organic and Inorganic Materials and Applications

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Piezoelectricity was first described by the Curie brothers in the late 1800s. The first materials investigated were natural materials such as bone and wood and single crystals such as quartz. Then in 1946 it was discovered that BaTiO 3 ceramic can be made piezoelectric through a poling process. This was followed by the discovery of lead zirconate titanate solid solutions (PZT) in 1954 of very strong lead effects which is still widely used in piezoelectric applications. In 1969, Kawai discovered large piezoelectricity in elongated and poled films of polyvinylidene fluoride (PVDF) opening the way for research into piezoelectric polymers. Piezoelectric polymers exhibit low density and excellent sensitivity and are mechanically tough and respond better to fatigue situations. Since 2010, research has focused on the production of melt-spun piezoelectric textile fibers, with the aim of integrating sensing/energy-harvesting capabilities into smart textile structures. In this chapter, a technological overview of the state-of-the-art research into piezoelectric, melt-spun, textile fibers will be presented. The methods used for the characterization of the fibers will also be discussed with special concentration on the electric response of the fibers after mechanical stimulation.

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Ferroelectrics

Cited by 2 publications

References 75 publications

Molecular dynamic study of dielectric polarization and ferroelectricity in a model polar polymer

Molecular dynamic study of dielectric polarization and ferroelectricity in a model polar polymer

Piezoelectric Melt-Spun Textile Fibers: Technological Overview

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