PIEZOELECTRIC PROPERTIES OF THIN-FILMS OF AROMATIC POLYUREA PREPARED BY VAPOR-DEPOSITION POLYMERIZATION

被引：93
|
作者：
TAKAHASHI, Y
UKISHIMA, S
IIJIMA, M
FUKADA, E
机构：
[1] Institute for Super Materials, ULVAC JAPAN Ltd. 29, Wadai
来源：
JOURNAL OF APPLIED PHYSICS | 1991年 / 70卷 / 11期
关键词：
D O I：
10.1063/1.349827
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Aromatic polyurea films of a few hundred nanometer thickness were prepared by vapor deposition polymerization of the monomers 4,4'-diaminodiphenylmethane and 4,4'-diphenylmethane-diisocyanate. Piezoelectric activity was observed after poling the films under an electric field of 100 MV/m at 210-degrees-C for 10 min. The piezoelectric stress constant (polarization/strain) remains constant at about 15 mC/m2 over the temperature range from -50 to 200-degrees-C. The multilayer film produced by the alternate deposition of polyurea layers and aluminum electrodes exhibited a response proportional to the number of layers. The residual polarization caused by alignment of the dipoles of the urea bond is believed to be the origin of the effect.
引用
收藏
页码：6983 / 6987
页数：5
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