| abstract |
A piezoelectric constant d 14 is large, to provide transparency, excellent piezoelectric polymer and its preparation dimensional stability. A helical chiral polymer having an optical activity with a weight average molecular weight of 50,000 to 1,000,000 is included, the crystallinity obtained by DSC method is 40% to 80%, and the transmission haze for visible light is 0. 0.0% to 40%, and the product of the normalized molecular orientation MORc and the crystallinity is 100 to 700 when the reference thickness measured with a microwave transmission type molecular orientation meter is 50 μm. , High molecular piezoelectric material. [Selection figure] None |