Orientation of Guest Molecules and Formation of Mesoporous Silica Induced by Layered Silicate-Organic Interactions |
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| Authors: | C Viney B Marcher L L Chapoy |
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| Institution: | 1. Department of Materials Science , Metallurgy, University of Cambridge , Pembroke Street, Cambridge, CB2 3QZ, U.K.;2. Department of Materials Science and Engineering , University of Washington , Seattle, WA, 98195, USA;3. Instituttet for Kemiindustri, The Technical University of Denmark , 2800, Lyngby, Denmark;4. Danaklon A/S , Engdraget 22, 6800, Varde, Denmark;5. Istituto Guido Donegani , Via G. Fauser 4, 28100, Novara, Italy |
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| Abstract: | Previous work has suggested that the molecular ordering in some main-chain thermotropic polymers is biaxial nematic. In one, a 60/40 copolyester of p-hydroxybenzoic acid and ethylene terephthalate residues, there is evidence for a temperature range where molecular rotation about the local chain axes occurs without an accompanying loss of overall chain segment alignment. The present paper reports a theoretical and experimental investigation of whether a magnetic field, applied to the polymer when held at such temperatures, can favour the formation of optical monodomains which are large enough to give an unambiguous uniaxial or biaxial interference figure. |
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| Keywords: | Biaxial nematic magnetic field interference figure |
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