Effect of curing conditions and formulation on the electro-optic properties of polymer dispersed cholesteric liquid crystal films

Authors

Cheryll Lei E. Mahinay ⋅ PH National Institute of Physics, University of the Philippines Diliman
Analiza B. Afable ⋅ PH National Institute of Physics, University of the Philippines Diliman
Zenaida B. Domingo ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

Polymer Dispersed Cholesteric Liquid Crystal (PDCLC) films have been fabricated via the Polymerization-Induced Phase Separation (PIPS) technique. E48:TM74A:PMMA PDCLCs, with varying LC:PMMA ratio and varying E48:TM74A weight ratio, have been characterized for their electro-optic properties. The PDCLC films have been UV-cured (λ = 365 nm) at various curing time. Transmittance measurements, conducted using a linear optics set-up with a He-Ne laser (λ = 632.8 nm) as probe beam while subjected to varying voltage, showed that 75:25 (LC:PMMA) films UV-cured at for 3 hours exhibited the best electro-optic response among all the samples. The use of cholesterics in PDCLCs resulted to a lower off-state transmittance and higher contrast ratio compared to purely nematic PDLCs. As a consequence, however, the threshold and driving voltages are increased for PDCLCs.

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Issue

2002: Proceedings of the 20th Samahang Pisika ng Pilipinas Physics Congress

Article ID

SPP-2002-PP-05

Section

Condensed Matter and Plasma Physics

Published

2002-10-23

How to Cite

[1]

CLE Mahinay, AB Afable, and ZB Domingo, Effect of curing conditions and formulation on the electro-optic properties of polymer dispersed cholesteric liquid crystal films, Proceedings of the Samahang Pisika ng Pilipinas 20, SPP-2002-PP-05 (2002). URL: https://proceedings.spp-online.org/article/view/SPP-2002-PP-05.