Piezoelectric material comprising a polymer network

Details Piezoelectric material comprising a polymer network Piezoelectric material comprising a polymer network

1993-03-25

1994-10-25

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310800, 264 22, 428421, 428422, 4251746, H01L 4108

Patent

active

053592530

ABSTRACT:
The invention relates to a piezoelectric element comprising a piezoelectric material 1, in the form of a polymer network, between at least two electrodes 2, 3. The piezoelectric material is formed from a starting material comprising a liquid crystalline monomeric material and a chiral compound. The starting material is brought to a temperature at which a smectic phase is formed, and an electric field is applied to obtain a dipolar orientation in the starting material, after which the polymer network is formed by means of photopolymerisation. The piezoelectric element thus manufactured can suitably be used for various electromechanical applications, as a sensor material, for pyroelectric applications and, in particular, also for optical applications.

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patent: 5105116 (1992-04-01), Okamoto et al.
patent: 5187402 (1993-02-01), Fujita et al.
"Experimental Proof of Piezoelectricity in Cholesteric and Chiral Smectic C*-Phases of LC-Elastomers" Vallerien et al, Makromol. Chem., Rapid Commun. 11, pp. 593-598 (1990).
"Piezoelectric Effects in Liquid Crystals" R. B. Mayer in Phys. Rev. Lett. 22 (18), pp. 918-921.
H. Stegemeyer et al, Liquid Crystals 10 (3) pp. 295-310 (1991).
Y. Yamada et al, Jap. 2. Appl. Physics 29 (9) pp. 1957-1964.

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