Abstract
Composite films and microfibers based on the biopolymer poly(ã‐benzyl á,L‐glutamate) (PBLG) and their fabrication and piezoelectric properties are presented. By simultaneous poling and curing of PBLG/methylmethacrylate, we fabricated a flexible composite film with approximately 20% of the PBLG molecules oriented normal to the film surface exhibiting (d33 = 20 pC/N), and its Young’s modulus was 1 GPa. In an effort to optimize net dipole orientation in PBLG, we produced piezoelectric microfibers (diameter: 100 nm) with nearly all of the PBLG dipoles oriented along the fiber axis, evidenced by x‐ray diffraction. The PBLG fibers showed high piezoelectricity (d33 = 32 pC/N) and an elastic modulus of 570 MPa. Both the piezoelectric film and fiber systems can be fabricated directly from solution in a mold or on a substrate. Due to the versatility in the fabrication process and the high piezoelectricity, these materials show great promise as transducer materials.
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