Open AccessInfluence of heat treatment temperature after the pressure expansion on the electromechanical properties of cellular polypropylene electret
Author(s) -
Qiu Xun-Lin,
Zhang Xia,
Feipeng Wang
Publication year - 2006
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.55.2578
Subject(s) - electret , materials science , polypropylene , composite material , electromechanical coupling coefficient , melting point , thermal expansion , atmospheric temperature range , modulus , piezoelectricity , thermodynamics , physics
The influence of heat treatment temperature after the pressure expansion on the electromechanical properties of cellular polypropylene (PP) electret is studied. The results point out that over the temperature range form RT to the melting temperature of the sample, the thickness of the sample after pressure expansion increases with the heat treatment temperature. Compared to that mentioned above, obviously different influence of heat treatment temperature on the electromechanical properties of cellular PP is observed. The elastic modulus and electromechanical coupling factor of cellular PP electret reach minimum and maximum at 90℃ heat treatment temperature, respectively. As a result, the piezoelectric d33 coefficient reaches its maximum of 377pC/N. Further, with the increase of heat treatment temperature, the resonance frequency of cellular PP could be regulated from about 794 to 371kHz.