Journal
CURRENT APPLIED PHYSICS
Volume 15, Issue 3, Pages 292-297Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2014.12.027
Keywords
PDLC; Polymer dispersed liquid crystal; Nematic liquid crystal; Smart window
Funding
- Basic Science Research Program through NRF - Ministry of Science, ICT & Future Planning [2013R1A1A1A05005298]
- Priority Research Centers Program by the Ministry of Education [2010-0020207]
- National Research Foundation of Korea [2013R1A1A1A05005298] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Polymer dispersed liquid crystal was synthesized by combining a UV curable polymer and a nematic liquid crystal. Optimized conditions for the optical properties of the PDLC were found to be the concentration ratio of LC and polymer at 7:3, UV curing time of 18 min, and the thickness less than 25 mm. In the case of the high LC concentration (>= 70%) sample, the amount of liquid crystal segregated in the polymerization process was enough to form a spherical shape of droplet, and the threshold driving voltage was reduced. The response time for the turn-on process was nearly independent of the concentration, while the turn-off process was almost proportional to the concentration. From microscopic image and UV-visible spectrum analysis, the relation between LC droplet morphology and optical properties were explained. (C) 2014 Elsevier B.V. All rights reserved.
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