Pyroelectric properties of linear aromatic polyurethanes

Author

Jayasuriya, A.C. ; Tasaka, S. ; Inagaki, N.

Author_Institution

Dept. of Mater. Sci., Shizuoka Univ., Hamamatsu, Japan

Volume

3

Issue

6

fYear

1996

fDate

12/1/1996 12:00:00 AM

Firstpage

765

Lastpage

769

Abstract

Two types of aromatic polyurethanes, poly(hexamethylene phenyl dicarbamate) (PUH6) and poly(heptamethylene biphenylene dicarbamate) (PUB7) have been synthesized by the polycondensation method. Structural, pyroelectric and dielectric properties of these polyurethanes were studied. The pyroelectric activity was studied in the temperature range from room temperature to 120°C for poled samples of both polyurethanes. The temperature dependence of the pyroelectric constant of both polyurethanes vanished around their glass transition temperatures. The experimental results given in this paper suggest that the pyroelectric behavior is possibly attributed to orientation of the urethane dipole in the amorphous phase. The pyroelectric coefficients obtained are 13 and 15 μm^-2K^-1 for the PUH6 and PUB7 samples, respectively

Keywords

dielectric losses; dielectric polarisation; glass transition; infrared spectra; permittivity; polymer structure; polymers; pyroelectricity; thermally stimulated currents; 20 to 120 degC; PUB7; PUH6; amorphous phase; dielectric properties; glass transition temperatures; linear aromatic polyurethanes; poled samples; poly(heptamethylene biphenylene dicarbamate); poly(hexamethylene phenyl dicarbamate); polycondensation method; pyroelectric properties; urethane dipole; Amorphous materials; Bonding; Glass; Hydrogen; Infrared spectra; Polarization; Polymers; Pyroelectricity; Spectroscopy; Temperature distribution;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.556557

Filename

556557