✦ LIBER ✦

Piezoelectricity of mechanically oriented S-elastomers

✍ Scribed by Tobias Eckert; Heino Finkelmann; Mario Keck; Walter Lehmann; Friedrich Kremer

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 396 KB
Volume: 17
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.1996.030171103

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Ferroelectricity and thus piezoelectricity are well known features of low molar mass chiral smectic C (S~c~^*^) liquid crystals. We present a new technique to orientate macroscopically the director as well as the smectic layers of a S~c~^*^‐polymer network by applying a suitable mechanical field. The uniform orientation of the network film is checked by X‐ray diffraction. According to the phase symmetry electromechanical measurements indicate the existence of a polar axis of the network and the direct as well as the inverse piezoelectric effect is demonstrated.

📜 SIMILAR VOLUMES

Second harmonic generation on mechanical

Second harmonic generation on mechanically oriented SC*-elastomers

✍ Ingo Benné; Klaus Semmler; Heino Finkelmann 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 314 KB

Piezoelectric and dielectric properties

Piezoelectric and dielectric properties of siloxane elastomers filled with bariumtitanate

✍ Dipak Khastgir; Keiichiro Adachi 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 166 KB 👁 2 views

Piezoelectric elastomers were prepared from suspensions of bariumtitanate (BaTiO 3 ) particles in a telechelic polydimethylsiloxane (t-PDMS) by crosslinking the t-PDMS under an electric field. Crosslinking reaction was monitored by measurement of complex dielectric constant Ј Ϫ iЉ. Dielectric consta

Smectic A Elastomers with Uniform Homeot

Smectic A Elastomers with Uniform Homeotropic Orientation Obtained by Applying a Biaxial Mechanical Field

✍ Etsushi Nishikawa; Jun Yamamoto; Hiroshi Yokoyama; Heino Finkelmann 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 259 KB

## Abstract **Summary:** The orientation behavior of a smectic A elastomer is investigated by applying a biaxial mechanical field to the elastomer in a swollen state. The network is composed of a siloxane‐polymer backbone, a bi‐functional cross‐linker, and a monomer with a perfluorinated tail. In t

CHARACTERIZATION OF MECHANICAL VIBRATION

CHARACTERIZATION OF MECHANICAL VIBRATION DAMPING BY PIEZOELECTRIC MATERIALS

✍ H.H. Law; P.L. Rossiter; G.P. Simon; L.L. Koss 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 321 KB

Piezoelectric materials (piezo-materials) convert mechanical energy into electrical energy via the mechanism of piezoelectricity, and this electrical energy may be dissipated through a connected load resistance. The energy dissipation through this mechanism is termed piezo-damping. New models based

Mechanical properties of HTPB-IPDI-based

Mechanical properties of HTPB-IPDI-based elastomers

✍ Serkan Burak Haska; Erdal Bayramli; Fikret Pekel; Saim Özkar 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 157 KB 👁 1 views

A polyurethane elastomer having mechanical and adhesive properties suitable for liner applications in solid rocket propellants was developed using HTPB as the prepolymer and IPDI as the curing agent. The effects of the NCO/OH ratio ( R value) and the triol/diol ratio on the mechanical properties of

Mechanical, thermal, and electric proper

Mechanical, thermal, and electric properties of polyurethaneimide elastomers

✍ Bogumiła Masiulanis; Ryszard Zielin̂ski 📂 Article 📅 1985 🏛 John Wiley and Sons 🌐 English ⚖ 473 KB 👁 1 views

Linear polyurethaneimide elastomers (PUI) were obtained from polyether-or polyesterdiols, diphenylmethane diisocyanate or bitolylene diisocyanate and pyromellitic acid dianhydride. It was found that these polymers have considerably better mechanical properties than typical linear polyurethanes (PU).