Bioelectret and biopiezoelectricity

Author

Fukada, Eiichi

Author_Institution

Inst. for Super Mater. ULVAC, Tsukuba, Japan

fYear

1991

fDate

25-27 Sep 1991

Firstpage

695

Lastpage

705

Abstract

Some biopolymers possess polar uniaxial orientation of molecular dipoles and show pyroelectricity and piezoelectricity. Some examples of bioelectret are described. Shear piezoelectricity is observed for elongated films of poly-L-lattic acid (PLLA). The temperature relaxations in complex piezoelectric constants, elastic constant, and dielectric constant are observed at the glass transition temperature around 90°C. However, the piezoelectric constants for the crystalline phase of PLLA calculated by a spherical dispersion theory are independent of temperature. Thin layers of aromatic polyurea prepared by vacuum deposition polymerization show pyroelectricity and piezoelectricity after poling, which are stable up to 200°C

Keywords

bioelectric phenomena; dielectric polarisation; elastic constants; electrets; glass transition (polymers); molecular biophysics; molecular orientation; permittivity; piezoelectric materials; polymer films; pyroelectricity; 200 degC; 90 degC; aromatic polyurea; bioelectret; biopiezoelectricity; biopolymers; complex piezoelectric constants; crystalline phase; dielectric constant; elastic constant; elongated films; glass transition temperature; molecular dipoles; piezoelectricity; polar uniaxial orientation; poling; poly-L-lattic acid; pyroelectricity; shear piezoelectricity; spherical dispersion theory; temperature relaxations; vacuum deposition polymerization; Biological materials; Bones; Dielectric materials; Optical polymers; Piezoelectric materials; Piezoelectric polarization; Piezoelectricity; Polymer films; Pyroelectricity; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1991. (ISE 7) Proceedings., 7th International Symposium on (Cat. No.91CH3029-6)

Conference_Location

Berlin

Print_ISBN

0-7803-0112-9

Type

conf

DOI

10.1109/ISE.1991.167297

Filename

167297