Abstract
As photofunctional materials, cellulose stilbene-4-carboxylate (SB-cellulose) and cellulose 2-methylstilbene-5-carboxylate (MSB-cellulose) were prepared and photoregulation of functions of the derivatives under irradiation with UV lights was investigated. Stilbene moieties in the SB-cellulose were found to undergo only irreversible isomerization from the trans to cis form under irradiation with UV light. However, 2-methylstilbene moieties in the MSB-cellulose do reversible isomerizations from the trans to cis form under irradiation with UV light above 290nm and the cis to trans form with about 250nm, although the cis to trans isomerization was not complete. Regulation of swelling abilities of MSB-cellulose in water and in benzene was examined under irradiation with UV light. The swelling ability in water was found to increase under irradiation with UV light above 290nm and decrease with about 250nm. On the other hand, that in benzene decreased under irradiation with UV light above 290nm and increased with about 250nm. Width of changes in the swelling ability under alternate irradiations with UV light was found to decrease only slightly even after 5 times of repeated alternate irradiation.
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