A novel method for encapsulation of a liquid crystal in monodisperse micron-sized polymer particles |
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Authors: | N-H Park S-Il Park K-D Suh |
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Institution: | (1) Department of Industrial Chemistry College of Engineering Hanyang University Seoul 133-791, Korea e-mail: kdsuh@email.hanyang.ac.kr Tel.: +82-2-22900526 Fax: +82-2-22952102, KR |
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Abstract: | Liquid crystals (LCs) encapsulated in monodisperse micron-sized polymer particles were prepared to control the size and size
distribution of LC droplets in polymer-dispersed LCs. The poly(methyl methacrylate) (PMMA) seed particles were swollen with
the mixture of liquid crystal, monomers (methyl methacrylate and styrene) and initiator by using a diffusion-controlled swelling
method. A single LC domain was produced by the phase separation between PMMA and LC through polymerization. The optical microscopy
and scanning electron microscopy showed that the particles are highly monodisperse with core–shell structure. Moreover, monodisperse
LC core domains were confirmed from polarized optical microscope observations. The final particle morphology was influenced
by the cross-linking of the seed particle. When linear PMMA particles, which are not cross-linked, were used as a seed, the
microcapsules were distorted after annealing for a few days; however, in the case of cross-linked PMMA particles, the core–shell
structure was sustained stably after annealing.
Received: 22 November 2000 Accepted: 12 March 2001 |
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Keywords: | Liquid crystal Encapsulation Polymer-dispersed liquid crystal Poly(methyl methacrylate) seed Diffusion-controlled swelling method |
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