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Materials 2014, 7(2), 1113-1121; doi:10.3390/ma7021113

Dielectric Properties of Dual-Frequency Reactive Mesogens before and after Photopolymerization

1
Division of Electrical, Electronic and Information Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
2
PRESTO (Precursory Research for Embryonic Science and Technology), Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan
*
Author to whom correspondence should be addressed.
Received: 30 December 2013 / Revised: 27 January 2014 / Accepted: 7 February 2014 / Published: 11 February 2014
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Abstract

The dielectric properties of reactive mesogens before and after photopolymerization were investigated. Commercially available nematic reactive mesogens (RMS03-013C, Merck) were measured and found to be dual-frequency liquid crystals. The property arose from the δ-relaxation process that was caused by rotational fluctuations parallel to the molecule’s long axis. After polymerization, the polymerized reactive mesogens still exhibited this dual-frequency property. The result was attributed to the β-relaxation process which arose from rotational fluctuations of localized parts of the main chain. The sign change of the dielectric anisotropy with increasing frequency after polymerization was opposite to the sign change before polymerization.
Keywords: reactive mesogen; dielectric property; dual frequency; liquid crystal; photopolymerization; dielectric anisotropy reactive mesogen; dielectric property; dual frequency; liquid crystal; photopolymerization; dielectric anisotropy
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Kumagai, T.; Yoshida, H.; Ozaki, M. Dielectric Properties of Dual-Frequency Reactive Mesogens before and after Photopolymerization. Materials 2014, 7, 1113-1121.

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