Piezoelectric element

摘要

Poly(α-amino acid) which contain: (A) a glutamic acid γ-ester unit represented by formula (I): and (B) one or more kinds of units selected from a glutamic acid γ-ester unit represented by formula (II), an alanine unit, a phenylalanine unit and an Nε-benzyloxycarbonyllysine unit, represented by formula (III), and a glutamic acid γ-ester unit represented by formula (IV) can be dissolved in various solvents and are useful for preparing piezoelectric elements which exhibit superior piezoelectricity.

主权项

1. A piezoelectric element, comprising at least one poly(α-amino acid), which contains:
(A) glutamic acid γ-ester units represented by formula (I):wherein R1 is a methyl group or a benzyl group; and
(B) units of one or more types selected from the group consisting of:
(1) a glutamic acid γ-ester unit represented by formula (II): wherein R2 is an unsubstituted alkyl group having 6 to 18 carbon atoms, or a substituted alkyl group having 1 to 6 carbon atoms, in which the hydrogen atoms are partly or entirely substituted by a halogen atom or an alicyclic hydrocarbon group having 3 to 12 carbon atoms;
(2) an alanine unit, a phenylalanine unit, and an Nε-benzyloxycarbonyllysine unit, which are represented by formula (III): wherein R3 is a methyl group, a benzyl group or a (CH2)4—NHZ group, in which Z is a benzyloxycarbonyl group; and
(3) a glutamic acid γ-ester unit represented by formula (IV): wherein each R4 may be the same or different and is an alkoxy group having 1 to 12 carbon atoms; an alkyl group having 1 to 12 carbon atoms, in which the hydrogen atoms are partly or entirely substituted by a halogen atom; or an alkylcarbonyl group, in which the alkyl group has 1 to 12 carbon atoms; l is an integer of 6 to 12; and m is an integer of 1 to 3.