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Preparation and Polarization Properties of Poly(vinyl alcohol) Polarizing Film Using the Mixed System of Supercritical $CO_2$/Organic Solvents/Dichroic Dye  

Park, Ki-Sang (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Choi, E-Joon (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Chang, Jin-Ho (Department of Materials Design Engineering, Kumoh National Institute of Technology)
Park, Il-Hyun (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Publication Information
Polymer(Korea) / v.35, no.5, 2011 , pp. 458-466 More about this Journal
Abstract
In the mixed system of supercritical carbon dioxide/organic solvents, poly(vinyl alcohol)(PVA) film of high degree of hydrolysis could be dyed with a dichroic dye of C. I. direct black 22(DB22) and as a result, high durability was obtained. Especially, as a dye dispersant in a supercritical fluid phase, a mixed solvent system of ethylene glycol: dimethyl sulfoxide=4 : 6 weight ratio was investigated. Then the optimum pressure for dyeing could be reduced down to 200 bar. Using this supercritical fluid system, the maximum dyeing appeared as the transmittance of less than 1% and the waste amount was reduced to the level of 1/10. After 500% drawing of this PVA film, both the polarizing efficiency of 94% and the single piece transmittance of 30% were obtained. The limitation of DB22 and further improvements were also discussed.
Keywords
poly(vinyl alcohol); polarizing film; dichroic dye; supercritical carbon dioxide; durability;
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