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- W304112855 abstract "The thermal and optical properties of poly{1-(cholesteryloxycarbonylalkanoyloxy)ethylene}s (PCALEn, n=2∼8,10, the number of methylene units in the spacer) were investigated. All of the homo- logues formed monotropic cholesteric phases with left-handed helical structures. PCALEn with n=2 or 10, in constrast with PCALEn with 3≤n≤8, did not display reflection colors over the full cholesteric range, suggesting that the helical twisting power of the cholesteryl group highly depends on the length of the spacer connecting the cholesteryl group to the polyethylene chain. The glass transition temperatures decreased with increasing n. The isotropic-cholesteric phase transition temperatures decreased with increasing n up to 7 and showed an odd-even effect. However it became almost constant when n is more than 7. This behavior is rationalized in terms of the change in the average shape of the side chain on varing the parity of the spacer. This rationalization also accounts for the observed variation of the entropy gain for the clearing transition. The thermal stability and degree of order in the mesophase and the temperature dependence of the optical pitch observed for PCALEn were significantly different from those reported for cellulose tri(cholesteryloxycarbonyl)alkanoates. The results were discussed in terms of the differences in the chemical structure and flexibility of main chain and the number of the mesogenic units per repeating unit." @default.
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- W304112855 date "2009-01-01" @default.
- W304112855 modified "2023-09-23" @default.
- W304112855 title "Thermal and Optical Properties of Poly{1-(Cholesteryloxycarbonylalkanoyloxy)ethylene}s" @default.
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