Shear piezoelectricity in single‐wall carbon nanotube/poly(γ‐benzyl‐L‐glutamate) composites

Abstract

Single-wall carbon nanotubes (SWCNTs) have been added to high molecular weight poly(c-benzyl-L-glutamate), or PBLG, to evaluate their effects on the polymer's shear piezoelectricity. While the addition of SWCNTs increased various PBLG physical properties such as electrical conductivity, dielectric constant, several mechanical properties, and electrostriction coefficient, the shear piezoelectricity remained constant up to a 0.3 wt % SWCNT concentration. The composite crystallinity, orientation, and SWCNT alignment (measured by X-ray diffraction, birefringence, and polarized Raman spectroscopy, respectively) were found to be constant up to this same con-centration, corroborating the shear piezoelectric findings. PBLG composites made with acid-treated (and therefore less electrically conductive) SWCNTs exhibited similar shear piezoelectric behavior, indicating that neither the SWCNT type, concentration (up to the percolation threshold), nor electrical conductivity influences PBLG shear piezoelectricity.Despite these studies that combined carbon nanotubes with polymers that exhibit tensile piezoelectricity, the effect of carbon nanotubes on shear piezoelectricity has not been

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