Summary
Three kinds of fully substituted cellulose derivatives, cellulose triheptanoate (CTH), tri-O-heptyl cellulose (THC) and tri-O-2-butoxyethyl cellulose (TBC) were prepared. These polymers, having a side chain of similar length but of differing chemical structure, were found to show significantly different therraotropic behavior: TBC forms a cholesteric liquid crystalline phase at temperatures between 50 °C and 165 °C, the cholesteric pitch covering the region of visible lights. THC also displays a cholestric structure at temperatures between 80 °C and 130 °C with pitches on the order of several micrometers. CTH appears to show liquid crystallinity only in a very limited temperature range around 100 °C.
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Yamagishi, T., Fukuda, T., Miyamoto, T. et al. Thermotropic cellulose derivatives with flexible substituents. Polymer Bulletin 20, 373–377 (1988). https://doi.org/10.1007/BF00255739
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DOI: https://doi.org/10.1007/BF00255739