Ferroelectric behavior and polarization mechanism in odd‐odd polyamide 11,11 |
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| Authors: | Shaobing Liu Zhe Cui Peng Fu Minying Liu Lingli Zhang Zhaopeng Li Qingxiang Zhao |
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| Affiliation: | 1. School of Materials Science and Engineering, Zhengzhou University, , Zhengzhou, 450052 China;2. Department of Material Science and Engineering, Luoyang Institute of Science and Technology, , Luoyang, 471023 China |
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| Abstract: | 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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| Keywords: | polyamides crystal structures ferroelectricity piezoelectricity odd‐odd nylon |
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