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

Authors

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