The cholesteric nature of cellulose triacetate solutions |
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| Authors: | G.H. Meeten P. Navard |
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| Affiliation: | Department of Physics, Sir John Cass School of Science and Technology, City of London Polytechnic, London EC3N 2EY, UK |
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| Abstract: | Solutions of cellulose triacetate (CTA) in trifluoroacetic acid (TFA) become liquid crystalline above a certain critical concentration. Using the techniques of spectrophotometry, wide-angle light scattering and circular dichroism we have shown that the mesophase formed is cholesteric. We have measured its pitch, which depends on polymer concentration, and shown that the cholesteric structure is right-handed. Measurements of optical activity and the optical effects of shear and magnetic fields are also described and discussed. |
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| Keywords: | Cellulose triacetate liquid crystals polymer mesophase macromolecular mesophase liquid crystal polymer polymer cholesteric |
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