Piezoelectricity and ferroelectricity in odd-odd nylons with long alkane segments

摘要

Piezoelectricity and ferroelectricity in odd-odd nylon 11,11 and nylon 13,13 are detected. The results indicate that the γ-phase is responsible for the high piezoelectric and ferroelectric response. The piezoelectric strain coefficient, d_(33), as high as -3.9 and -4.1 pC/N is obtained at room temperature for stretched nylon 11,11 and nylon 13,13 films, respectively. The coercive electric field, E_c, values of about 55 and 88 MV/m are obtained for nylon 11,11 and nylon 13,13 films, respectively. And a remanent polarization, P_r about 40mC/m~2 has been found in both films. Compared with nylon 11,11, the lower coercive electric field (E_c) in nylon 13,13 is attributed to its longer alkyl chains. These odd-odd nylons have the potential in electroactive applications.