Dielectric Hysteresis Loop in Alicyclic and Aromatic Polyamides

Murata, Yukinobu; Tsunashima, Kenji; Koizumi, Naokazu

doi:10.1143/jjap.33.l354

Cited by 21 publications

(13 citation statements)

References 6 publications

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“…The ferroelectric hysteresis loop is also observed in quenched polyamide MXDn, and the nature of the ferroelectricity has been attributed to the amide groups in amorphous regions . Other polyamides such as polyamide 6I, 6T, 6I/6T copolymer, and BACn all exhibit ferroelectric behavior and clear D‐E hysteresis loops are obtained …”

Section: Introductionmentioning

confidence: 90%

Ferroelectric behavior and polarization mechanism in odd‐odd polyamide 11,11

Liu

Cui

et al. 2014

J Polym Sci B Polym Phys

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Ferroelectric and piezoelectric behavior in odd‐odd polyamide 11,11 are successfully detected for the first time. The maximum coercive field (Ec) of 90 MV/m, and a remnant polarization (Pr) of 40 mC/m2 are obtained at room temperature. A piezoelectric strain coefficient (d33) value as high as −3.9 pC/N has been found in stretched polyamide 11,11 film. The structural change of samples before and after poling is investigated by wide‐angle X‐ray diffraction patterns, differential scanning calorimetry, and Fourier transform infrared spectroscopy. The results indicate that the nature of the ferroelectricity originates from amide group dipoles in the γ‐form crystal regions. Hysteresis behavior appears to result from the crystallites reversal mechanism. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014, 52, 1094–1099

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Section: Introductionmentioning

confidence: 90%

Ferroelectric behavior and polarization mechanism in odd‐odd polyamide 11,11

Liu

Cui

et al. 2014

J Polym Sci B Polym Phys

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“…4 Therefore, in order to understand the EAPap material in detail, we analyzed the polarization behavior of EAPap depending on electric field by Sawyer-Tower circuit method. shows a unique polarization behavior of cellulose EAPap.…”

Section: Resultsmentioning

confidence: 99%

Electrical and Mechanical Characterization of Nanoscale-Layered Cellulose-Based Electro-Active Paper

Yun

Yun²,

Kim³

et al. 2011

j nanosci nanotechnol

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In order to understand the electro-mechanical behavior of piezoelectric electro active paper (EAPap), the converse and direct piezoelectric characterization of cellulose EAPap was studied and compared. A delay between the electrical field and the induced strain of EAPap was observed due to the inner nano-voids or the localized amorphous regions in layer-by-layered structure to capture or hold the electrical charges and remnant ions. The linear relation between electric field and induced strain is also observed. The electro-mechanical performance of EAPap is discussed in detail in this paper.

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“…polarizations have been measured for a series of polyamides containing m-xylylenediamine (37) and for those containing 1,3-bis(aminomethyl)cyclohexane (38). Pyroelectricity has been observed in nylon-11 (39) and nylon-5,7 (40).…”

Section: Physical Propertiesmentioning

confidence: 99%

Polyamides

Weber

2011

Kirk-Othmer Encyclopedia of Chemical Technology

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Polyamides are high polymers that contain the amide repeat linkage in the polymer backbone. Some common terms used with polyamides are nylon, aramid, and polyphthalamide. Nylon is defined as any polyamide having less than 85% of the amide group directly connected to two aromatic groups. Aramid is a polyamide having 85% or more of the amide groups directly connected to two aromatic groups. Polyphthalamide is a polyamide in which the residues of terephthalic acid or a combination comprise at least 55 mol% of the dicarboxylic acid portion of two repeating units in the polymer chain. This article is a general overview of polyamides, with emphasis on technology developed since 1980. There is an extensive coverage of properties including chemical reactions. Manufacturing for most of the important polyamides is discussed. Commercial polyamides incorporate three classes of additives: endcappers; branching agents; and chain couplers. Because of economic advantages and governmental regulations, there has been a substantial increase in recycling of the starting materials for polyamides and energy, most often as steam.

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Dielectric Hysteresis Loop in Alicyclic and Aromatic Polyamides

Cited by 21 publications

References 6 publications

Ferroelectric behavior and polarization mechanism in odd‐odd polyamide 11,11

Ferroelectric behavior and polarization mechanism in odd‐odd polyamide 11,11

Electrical and Mechanical Characterization of Nanoscale-Layered Cellulose-Based Electro-Active Paper

Polyamides

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