Novel Primary Dispersion in Viscoelastic Behavior of Ferroelectric Nylon 6

Takahashi, Tsutomu; Itoh, Takashi; Fujiwara, Susumu; Hashimoto, Masato

doi:10.1295/polymj.pj2008282

Cited by 1 publication

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References 5 publications

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“…However, our recent study reported poling electric-field-induced ferroelectric behavior for mesomorphic even-numbered nylons (e.g., nylon-12 and nylon-6) . More importantly, the ferroelectricity is generated within the crystalline mesophases with twisted chains, rather than from the amorphous phase as reported in the past. − This viewpoint unifies the origin of ferroelectricity in nylons, whether odd- or even-numbered. Basically, the pseudohexagonal mesomorphic structures in the quenched and stretched nylon films are highly defective with twisted chain conformations and disordered/dangling hydrogen bonds.…”

Section: Introductionmentioning

confidence: 58%

Understanding the Paraelectric Double Hysteresis Loop Behavior in Mesomorphic Even-Numbered Nylons at High Temperatures

2017

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Novel ferroelectric properties, such as slim double and single hysteresis loop (DHL and SHL) behaviors, are attractive for high energy density and low loss dielectric applications. In this study, temperature-dependent ferroelectric behavior was studied for mesomorphic even-numbered nylons (i.e., nylon-12 and nylon-6) using electric displacement− electric field (D−E) loop measurements. Upon raising the temperature from room temperature to 100 °C, the D−E loops became increasingly narrower, finally leading to slim DHLs with significantly enhanced apparent dielectric constants (i.e., ∼30 and ∼60) and small remanent polarizations (i.e., 3.5 and 8.2 mC/m 2 ) for quenched and stretched nylon-12 and nylon-6, respectively. Combining wide-angle X-ray diffraction and infrared studies, changes in the mesophases and orientation of hydrogen-bonded amide groups after electric poling were used to unravel the structure−ferroelectric property relationship for the even-numbered nylons. At 100 °C, the quenched and stretched nylon-12 and nylon-6 films exhibited a paraelectric mesophase with twisted chain conformation and disordered hydrogen bonds. Upon high field poling (>100 MV/m), transient nanodomains could be generated with additional twists in the main chain. The observed DHL behavior was attributed to the electric-fieldinduced reversible transitions between the paraelectric (less twisted chains) and ferroelectric (more twisted chains) states in the mesomorphic crystals of even-numbered nylons. The knowledge gained from this study can inspire potential applications of nnylons for electric energy storage, e.g., high temperature and high energy density multilayer polymer film capacitors.

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