Thermotropic liquid-crystal/polymer microcapsules prepared by in situ suspension polymerization
| Autor: | Ok-Sub Lee, Sang-Hoon Han, Han-Kon Kim, Hee-Kyung Ju, Hak-Hee Kang, Jin Woong Kim, Kyung-Do Suh, Ih-Seop Chang |
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| Rok vydání: | 2002 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Radical polymerization technology industry and agriculture Polymer Thermotropic crystal chemistry.chemical_compound Colloid and Surface Chemistry chemistry Chemical engineering Polymerization Liquid crystal Phase (matter) Polymer chemistry Materials Chemistry Suspension polymerization Physical and Theoretical Chemistry Methyl methacrylate |
| Zdroj: | Colloid & Polymer Science. 280:879-885 |
| ISSN: | 1435-1536 0303-402X |
| DOI: | 10.1007/s00396-002-0696-x |
| Popis: | In this study, thermotropic liquid-crystal/polymer microcapsules were produced via in situ suspension polymerization. The phase separation between cholesteryl liquid crystal (CLC) and poly(methyl methacrylate) (PMMA) in the droplets was induced by polymerization, resulting consequently in uniform liquid-crystal-containing polymer microcapsules. The phase behavior of the microcapsules was dependent on the loading amount of the liquid crystals and the degree of cross-linking of the polymer phase. Above 30% loading amount of CLC, the liquid crystals started to appear clearly. It was found that the spherical morphology of the microcapsules was achieved within a slight degree of cross-linking of the PMMA phase. At a high degree of cross-linking, nonspherical particles with a rough surface and deeper dents were obtained, which was due to the elastic-retractive force of the cross-linked network. The liquid-crystal/polymer microcapsules produced in this study could find great applicability in pharmaceutics and electronics as a smart drug carrier. |
| Databáze: | OpenAIRE |
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