Dielectric Change of Copper Phthalocyanine and Polyurethane
Foam with High Elasticity as a Function of Pressure Discussed in Terms
of Conversion from Natural Mechanical Energy to Electric Energy
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Abstract
A composite
with both high permittivity and high elasticity was
prepared by using copper phthalocyanine (CuPc) and polyurethane (PU)
foam. The formation and chemical, structural, and electrical characterizations
of CuPc and the PU/CuPc composites were described, and a variety of
analytical methods were proposed to examine the structure and the
morphology of the specimens. The electrical characterization of the
specimens was performed for a molded CuPc film and the PU/CuPc composite
in the frequency range from 0.1 Hz to 1 MHz. The frequency dependencies
of impedance (<i>Z</i>*), permittivity (ε*), and electrical
modulus (<i>M</i>*) were analyzed by combinational models
of circuits. The effects of the enhanced dielectric properties of
the composite at 0.1 Hz indicating predominance of the dc component
were evaluated by the tunneling effect theoretically. The electric
energy evaluated as a function of pressure suggested that the PU/CuPc
composite foam is a promising material with successful conversion
from natural mechanical energy to electric energy
