Temperature dependence of piezoelectric constants for polyureas synthesized by vapor deposition polymerization

Author

Fukada, Eiichi ; Wang, Xian-Shan ; Hattori, Takeshi ; Iijima, Masayuki ; Takahishi, Y.

Author_Institution

Inst. for Super Mater., ULVAC, Tsukuba, Japan

fYear

1994

fDate

7-9 Sep 1994

Firstpage

715

Lastpage

719

Abstract

Thin films of aromatic and aliphatic polyureas are prepared by the evaporation and deposition of a diamine monomer and a diisocyanate monomer onto a polyimide substrate in a vacuum chamber. Application of a high electric field induces the films a residual polarization due to the alignment of urea bond dipoles. The piezoelectric constants for aromatic polyureas are almost unchanged from -150°C to 200°C. While those for aromatic polyureas show relaxational change due to the thermal molecular motions

Keywords

dielectric polarisation; dielectric thin films; piezoelectric materials; piezoelectric thin films; polymer films; polymerisation; vacuum deposited coatings; -150 to 200 C; aliphatic polyureas; aromatic polyureas; deposition; diamine monomer; diisocyanate monomer; evaporation; piezoelectric constants; polyimide substrate; polyurea; relaxational change; residual polarization; temperature dependence; thermal molecular motions; thin films; urea bond dipoles alignment; vapor deposition polymerization; Aluminum; Chemical vapor deposition; Electrodes; Hydrocarbons; Piezoelectric films; Polyimides; Polymer films; Substrates; Tellurium; Temperature dependence;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1994. (ISE 8), 8th International Symposium on

Conference_Location

Paris

Print_ISBN

0-7803-1940-0

Type

conf

DOI

10.1109/ISE.1994.515216

Filename

515216