Kinetic dissolution behavior and mechanism of bamboo cellulose fiber by TEMPO-catalyzed oxidation
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Oxidation of cellulosic fibers by the TEMPO system is highly efficient for obtaining micro/nano-sized fibrils. In this study, the dissolution degree related to the yield of products has been firstly and deeply investigated with treating bamboo pulps under various process conditions. Moreover, the dissolution behavior and mechanism for revealing the “phase transition” process of cellulosic fibers have been also studied. From the kinetic behavior results, it was found that the end dissolution degree of original pulps is almost fully controlled by the time-dependent TEMPO and especially NaOCl concentration. Meanwhile, the NaBr dosage and process temperature could also affect the dissolution rate. Based on the dissolution data, a two-stage dissolution kinetic model was firstly presented. According to the model, the difficulty of the dissolution process was evaluated.
KeywordsTEMPO oxidation Dissolution kinetics Oxidation efficiency Bamboo cellulosic fibers
This work was supported by the National Key Research and Development Program of China (Grant Nos. 2018YFC1902102; 2018YFC1902105), the Foundation of State Key Laboratory of Pulp and Paper Engineering of China (Nos. 201810; 201745), Zhejiang Provincial Natural Science Foundation of China (No. LQ18C160003) and the National Natural Science Foundation of China (No. 21808209).
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