Abstract
A new cellulose derivative, pentyl ether of hydroxypropyl cellulose (P-HPC), and its crosslinked gel (PG-HPC) were prepared in non-aqueous solution. The temperature dependence of the optical pitch for the thermotropic mesophases formed by P-HPC and PG-HPC was determined spectroscopically. PG-HPC displayed the cholesteric reflection colour at room temperature and its cholesteric order and structure were fixed on heating up to 90°C. The optical pitch of the redried gel of PG-HPC, after swelling in tetrahydrofuran (THF), was shifted to lower wavelength and the reflection band became narrower than that of the original, before swelling in THF.
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