Polyureas piezoelectric properties

Takahashi, Y., Ukishima, S., lijima, M., and Fukada, E., Piezoelectric properties of thin films of aromatic polyurea prepared by vapour deposition polymerization, J. Appl. Phys., 70, 6983-6987 (1991). 

Odd-numbered nylons, the next most widely investigated semicrystalline piezoelectric polymers, have excellent piezoelectric properties at elevated temperatures but have not yet been embraced in practical application. Other semicrystalline polymers including polyureas, liquid crystalline pol5oners, biopolymers, and an array of blends have been studied for their piezoelectric potential and are summarized in the following section. The chemical repeat imit and piezoelectric constants of several semicrystalline pol3uners are listed in Table 3. 

Y. Ihkahashi. S. UUshima, M. lijima. and E Fukada, Piezoelectric properties of thin Alms of aromatic polyurea prepared by vapor deposition polymerization. J. AppL Pkys. 7)9 6983 (1991). 

An exploration (27) of the dielectric and pyroelectric properties of polyurea films led to the discovery of their piezoelectricity. From the early 1990s to the... 

Hattori T, Takahashi T et al (1996) Piezoelectric and ferroelectric properties of polyurea-5 thin films prepared by v or deposition polymerization. J Appl Phys 79 1713 Heaviside O (1885) Electromagnetic induction and its propagation, electrization and electrification. Natural electrets. Electrician 230-231... 

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