Study on TEMPO-mediated Oxidation of Unbleached Non-wood Pulps
In this study,unbleached wheat straw and bamboo pulps were oxidized by TEMPO-NaBr-NaClO system.Both the fiber morphologies and properties of pulps before and after oxidation were studied.Besides,the kinetics of oxidation process was analyzed.The results showed that both TEMPO-NaC1O-NaBr oxidation processes of unbleached wheat straw and bamboo pulps could be described by second-order reaction kinetics equation.After oxidation the contents of carboxyl groups in wheat straw and bamboo pulps increased significantly and reached 569.8 μ mol/g and 716.7 μmol/g,respectively.However,the viscosity and thermal stability of the pulps were obviously decreased.Moreover,the microstructure and size of the fibers were almost unchanged before and after the oxidation.The crystalline structure of cellulose Ⅰ of the pulps were maintained after oxidation,while the crystalline indices were slightly increased.
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