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The Influence of Fabrication Parameters on the Piezoelectric and Ferroelectric Responses of Poly(pelargonamide) Membranes
Author(s) -
Yu Hsin Her,
Hsu ChenSheng
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010901)202:13<2760::aid-macp2760>3.0.co;2-i
Subject(s) - poling , ferroelectricity , membrane , materials science , piezoelectricity , dipole , scanning electron microscope , hysteresis , electric field , fabrication , polymer chemistry , composite material , analytical chemistry (journal) , condensed matter physics , dielectric , optoelectronics , chemistry , organic chemistry , medicine , biochemistry , physics , alternative medicine , pathology , quantum mechanics
Synthesized poly(pelargonamide) membranes are shown to be a ferroelectric polymeric material based on the demonstration of the D‐E hysteresis curves of the oriented and unoriented samples. Dipole switching required a lower electric field excitation with increasing stretching ratio caused by a better orientation of the dipoles upon the uniaxial stretching of the membranes. The ferroelectric response of the samples could be greatly enhanced by uniaxial cold‐drawn. When T was > T g , and d 31 was kept constant then e 31 increased non‐linearly with P r for the samples within the range of the stretching ratio. However, both d 31 and e 31 increased nonlinearly with P r for the samples within the range of the stretching ratio if T < T g . Scanning electron microscopy photographs illustrate the stretching and poling effects on the packing of the macrofibrils of the specimens. The origin of the piezoelectric response of the poly(pelargonamide) membranes was considered to account for the effect of the dipoles reorientation under the electric field poling and was evidenced by polarized infrared spectroscopy examinations.