Journal
CARBOHYDRATE POLYMERS
Volume 68, Issue 1, Pages 159-165Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2006.07.029
Keywords
ester and ether cellulose derivatives; liquid crystals; electro-optical cells; electro-optical properties
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In this work we used hydroxypropylcellulose (HPC) and acetoxypropylcellulose (APC) to produce free standing solid films (similar to 60 mu m) for electro-optical devices. Cellulose derivatives films were prepared from crosslinked both HPC and APC isotropic and liquid crystalline solutions without and with a low molecular weight nematic liquid crystal mixture (LC) E7. Films prepared from anisotropic solutions presented a band texture and E7 droplets of micron and submicron size were found to coexist with the band texture in the films prepared with E7. The optical cells were composed by the cellulose derivatives films covered on both free surfaces by a layer of the LC E7 and placed between two transparent conducting substrates. All the electro-optical cells prepared showed switching times in the range of some milliseconds to hundreds of milliseconds. The on-voltage (V-on) is lowered for cells prepared with the ester derivative film obtained from isotropic solutions. The maximum transmission values show a clearly tendency to decrease for the cellulosic matrix prepared from anisotropic solutions with and without nematic liquid crystal droplets. (c) 2006 Elsevier Ltd. All rights reserved.
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