Effect of chiral isosorbide groups on mesomorphic properties of side-chain liquid-crystalline polysiloxanes
| Autor: | Heng-Da Gu, Li Chen, Jing-Xi Yan |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Materials science Mesophase General Chemistry Polymer Condensed Matter Physics chemistry.chemical_compound Crystallography Monomer Differential scanning calorimetry chemistry Liquid crystal Siloxane Side chain Organic chemistry General Materials Science Fourier transform infrared spectroscopy |
| Zdroj: | Liquid Crystals. 36:1319-1327 |
| ISSN: | 1366-5855 0267-8292 |
| DOI: | 10.1080/02678290903220980 |
| Popis: | Chiral side-chain liquid-crystalline (LC) polysiloxanes containing isosorbide groups were graft copolymerised with poly(methylhydrogeno)siloxane, a chiral LC monomer 6-(4-methoxy-benzoyloxy)-hexahydro-furo[3,2-b]furan-3-yl 4'-(4-undec-10-enoyloxy-benzoyloxy)-biphenyl-4-yl adipate and a nematic LC monomer 4'-(4-methoxy-benzoyloxy)-biphenyl-4-yl 4-(2-undec-10-enoyloxy-ethoxy)-benzoate. The chemical structures and LC properties of the monomers and polymers were characterised by use of various experimental techniques including Fourier transform infrared spectroscopy (FTIR), 1H-nuclear magnetic resonance (NMR), element analyses (EA), differential scanning calorimetry (DSC), polarised optical microscopy (POM) and X-ray diffraction (XRD). All the chiral LC polymers showed LC properties with very wide mesophase temperature ranges and the chiral component in the LC polymer systems lead to the appearance of a cholesteric phase. The polymers bearing most chiral LC monomer component showed smectic phases by reason of... |
| Databáze: | OpenAIRE |
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