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Nanofibrillation of a Bleached Acacia Pulp by Grinding with Carboxymethylation Pretreatment
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Author NameAffiliation
Ming He State Key Laboratory of Biobased Material and Green Papermaking /Key Lab of Pulp & Paper Science and Technology of Education Ministry of China, Qilu University of Technology (Shandong Academy of Sciences), Ji’nan, Shangdong Province, 250353, China 
GuiHua Yang* State Key Laboratory of Biobased Material and Green Papermaking /Key Lab of Pulp & Paper Science and Technology of Education Ministry of China, Qilu University of Technology (Shandong Academy of Sciences), Ji’nan, Shangdong Province, 250353, China 
JiaChuan Chen State Key Laboratory of Biobased Material and Green Papermaking /Key Lab of Pulp & Paper Science and Technology of Education Ministry of China, Qilu University of Technology (Shandong Academy of Sciences), Ji’nan, Shangdong Province, 250353, China 
FanGong Kong State Key Laboratory of Biobased Material and Green Papermaking /Key Lab of Pulp & Paper Science and Technology of Education Ministry of China, Qilu University of Technology (Shandong Academy of Sciences), Ji’nan, Shangdong Province, 250353, China 
Qiang Wang State Key Laboratory of Biobased Material and Green Papermaking /Key Lab of Pulp & Paper Science and Technology of Education Ministry of China, Qilu University of Technology (Shandong Academy of Sciences), Ji’nan, Shangdong Province, 250353, China 
Fund Project:The authors are grateful for financial support from the National Key Research and Development Program of China (Grant No. 2017YFB0307900), the National Natural Science Foundation of China (Grant No. 31470602, 31670595, 31770628) and the Taishan Scholars Program.
 
Abstract:In this study, carboxymethylation, which introduces carboxyl groups to hydroxyl sites in pulp fibers, was used as a pretreatment before mechanical nanofibrillation. The carboxyl group content of the pulp fibers was greatly affected by the dosage of chloroacetic acid and the reaction temperature. During the following fibrillation process, it was found that pulp fibers with higher carboxyl group content exhibited higher water holding capacities and smaller dimensions. A more homogenous structure with a higher amount of individual fibrils was also observed in FE-SEM images of pulp fibers with high carboxyl group content. This can be explained by a high ionic group content in the fiber wall resulting in lower delamination resistance, making the fibrils easier to separate. Carboxymethylation pretreatment as a facilitator of fibrillation in cellulosic pulps is an efficient way to obtain cellulose nanofibrils and consequently decrease the energy consumption of the process.
keywords:nanofibrillation  grinder  carboxymethylation  pretreatment  bleached acacia pulp
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