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Two types of Sisal cellulose were studied as starting material for homogeneous acylation in the solvent dimethyl sulfoxide (DMSO)/tetrabutylammonium fluoride trihydrate (TBAF). The native Sisal cellulose investigated contains 14% hemicellulose (mainly composed of xylose) as confirmed by 13C-NMR spectroscopy in DMSO-d6/TBAF and HPLC analysis after complete polymer degradation. Alkali treatment of Sisal...
This paper summarizes selected results obtained during a two-year research project in the framework of the focus program ‘Cellulose and cellulose derivatives’ (SPP 1011), sponsored by the German Science Foundation (DFG). New synthesis paths for the preparation of the most important cellulose ester, cellulose acetate, were investigated. In contrast to conventional methods, cellulose was converted in...
The syntheses of several derivatized cellulose ether halfesters with dissolution points above pH 7 are described. Fluorescent dyes were incorporated into these polymers, and the rate of fluorescent dye release as a function of pH was determined. Dye containing polymers were employed to create a new fiber optic sensor system for detecting pH changes over long time periods. In this study, sensors...
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