CELL 270 |
| Conventional application of fluorescent whitening agents (FWAs) in paper for increased brightness relies on their solubility to reach cellulosic surfaces and their efficient retention. However, the improved solubility of new developed FWAs impairs their retention onto fibers and the surface-retained FWAs experiment degradation by exposure to daylight (photo reversion). Cyclodextrins (CD) are cyclic oligosaccharides with a torous structure ideal for encapsulation of active compounds. In this study, it is shown that inclusion of conventional FWAs into the interior of CD facilitates their solubilization in water, stabilizes them and increases their fluorescence as evidenced by the measured thermodynamic constants of the CD inclusion complexes of ANS, Uvitex OB and Blankophor (FWAs agents of the stilbene sulfonate and benzoxazole types) in solution. Results indicate that enhanced brightness and lower photo reversion of paper hand sheets can be achieved by addition of complexed FWAs-CD compared to conventional addition of FWAs to pulp. |
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Nanotechnology: A Fiber Perspective
8:20 AM-11:45 AM, Thursday, April 10, 2008 Morial Convention Center -- Rm. R09, Oral
Division of Cellulose & Renewable Materials |