Ordered Piezoelectric Networks via a Liquid-Crystalline Monomer Strategy: Synthesis of the LC Monomer.
Abstract
Piezoelectric materials are used in many technological applications. The physical requirements for piezoelectricity are a high degree of bulk order and a noncentrosymmetric bulk structure. Conventional single crystal piezoceramics possess a high degree of order and long term stability; however, they are brittle and difficult to fabricate. Poled piezoelectric polymers offer ease of fabrication and processing; however, they lack long term thermal and mechanical stability. A new technique is described for synthesizing highly ordered, heavily crosslinked piezolectric networks which offer high order and stability as well as ease of fabrication and processing. Crosslinkable, chiral smectic C liquid-crystalline monomers are used to form a layered noncentrosymmetric phase, which is then oriented by an external electric field to generate a monodomain structure. In situ photopolymerization then forms the final noncentrosymmetric network. The key to the success of this strategy is the design and synthesis of a polymerizable liquid crystal with the correct symmetry and phase properties. In this report, we describe our progress towards such a monomer system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 12, 1996
- Accession Number
- ADA319526
Entities
People
- B. C. Baxter
- D. L. Gin
Organizations
- University of California, Berkeley