Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 48, Issue 13, Pages 2838-2845Publisher
WILEY
DOI: 10.1002/pola.24060
Keywords
beta-cyclodextrin; click chemistry; liquid crystal; phase behavior
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Funding
- National Nature Science Foundation of China [20874082]
- Hunan Provincial Education Department [06A068]
- Ministry of Education for Science and Technology [207075]
- New Century Excellent Talents in University [NCET-05-0707]
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A well-defined structure liquid crystal heptakis [6-deoxy-6-(1-H-1,2,3-triazol-4-yl)(methyl)6-(4-methoxybiphenyl-4'-yloxy) hexanoyl]beta-cyclodextrin (H6B-beta-CD) was synthesized from propargyl 6-(4-methoxybiphenyl-4'-yloxy) hexanoate (P6B) and heptakis (6-deoxy-6-azido)-beta-cyclodextrin ((N-3)(7)-beta-CD) by click reaction. The chemical structure of H6B-beta-CD was confirmed by H-1 NMR, FTIR, and MALDI-TOF MS. The thermal stability of the compound was investigated by thermogravimetric analysis (TGA). The liquid crystalline behavior was studied by differential scanning calorimetry (DSC), polarizing optical microcopy (POM), and wide-angle X-ray diffraction (WAXD) measurement. These investigations have shown that the supramolecular structure of H6B-beta-CD are consisted of a large scale ordered lamellar structure and a small scale ordered structure (SmE) at low temperature region. As the temperature increases, the small scale structure becomes disordered relatively in the first instance, from smectic E to smectic A. Then, the lamellar structure collapses and nematic phase and isotropic phase are observed in sequence. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 2838-2845, 2010
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