The piezoelectric coefficients of most technologic synthetic polymers. Abbreviations: PVDF: poly(vinylidene fluoride), PVDF-TrFE: poly(vinylidene fluoride trifluorethylene), PLA: poly(lactic acid), PVC: poly(vinyl chloride), PAN: poly(acrylonitrile), PVDCN-VAc: poly(vinylidenecyanidevinyl acetate), (β-CN)APB/ODPA: nitrile substituted polyimide.