Phase Transitions in Smectic Bent-Core Main-Chain Polymer Networks Detected by Dielectric and Ultrasonic Techniques

被引：0

作者：

Samulionis, V. ^{[1
]}

Svirskas, S. ^{[1
]}

Banys, J. ^{[1
]}

Sanchez-Ferrer, A. ^{[2
]}

Gimeno, N. ^{[3
]}

Ros, M. B. ^{[3
]}

机构：

[1] Vilnius State Univ, Fac Phys, LT-10222 Vilnius, Lithuania

[2] ETH, Dept Hlth Sci & Technol, CH-8092 Zurich, Switzerland

[3] Univ Zaragoza, Mat Sci Inst Aragon ICMA, E-50009 Zaragoza, Spain

来源：

FERROELECTRICS | 2015年 / 479卷 / 01期

关键词：

Keywords Polymer network; dielectric properties; ultrasonic properties; liquid crystals; bent-core; phase transitions;

D O I：

10.1080/00150193.2015.1012011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The dielectric and ultrasonic properties of a bent-core main-chain liquid-crystalline polymer network have been investigated. Dielectric measurements on this material showed two maxima in the real and imaginary components of the dielectric permittivity at 365K and 450K along with a temperature hysteresis showing the first order nature of the two phase transitions. Longitudinal ultrasonic attenuation and ultrasonic velocity measurements at 10MHz frequency revealed some anomalies at the phase transition temperatures respect to the dielectric results. Above room temperature, a large ultrasonic attenuation was observed which can be related to the glass transition of this sample. Moreover, the piezoelectric sensitivity of this bent-core main-chain liquid-crystalline polymer network has also been studied.

引用

页码：76 / 81

页数：6

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