Preparation of Cellulose Nanofibrils by Multi-Site Regioselective Oxidation

作     者：Liying Song Xixiang Pei Rui Li Haitao Chen Xiaozheng Sun 

作者机构：College of EngineeringNortheast Agricultural UniversityHarbin150030China Harbin Botai Biological Technology Co.Ltd.Harbin150030China 

出 版 物：《Journal of Renewable Materials》 (可再生材料杂志（英文）)

年 卷 期：2020年第8卷第10期

页      面：1269-1282页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0706[理学-大气科学] 080502[工学-材料学] 

基　　金：This research was funded by The Talents Project for Harbin Science and Technology Innovation,grant number 2016RAXXJ006 China Postdoctoral Science Foundation,grant number 2017M611341 

主　　题：Cellulose nanofibril multi-site regioselective oxidation total content of carboxylate and aldehyde groups particle width 

摘      要：Cellulose nanofibrils(CNFs)are promising sustainable materials that can be applied to nanocomposites,as well as medical and life-sciences ***,methods for the preparation of these important materials are energy intensive because heating and mechanical disintegration are required to produce cellulose fibers below 100 nm in *** this study,CNFs were prepared through the multi-site regioselective oxidation of cellulose with 2,2,6,6-tetramethylpiperidine-1-oxyl(TEMPO)and periodate at room temperature(20–25°C),without any mechanical-disintegration *** electron microscopy(TEM)revealed that the CNFs had the average widths of 14.1,55.4,and 81.9 nm for three different ***-transform infrared spectroscopy revealed that carboxyl groups were created on the surfaces of the microfibrils,while X-ray diffraction studies showed that the cellulose I structure was maintained after oxidation,and that the cellulose nanofibril crystallinity index exceeded 70%.These results demonstrate that CNFs can be prepared by multi-site regioselective oxidation at room temperature in the absence of mechanical disin*** addition,a model was developed to calculate the total content of carboxylate and aldehyde groups of CNFs prepared by the TEMPO mediate oxidation,the periodate oxidation,and the multi-site regioselective oxidation methods based on the particle width determined by *** calculated values of the model were in good agreement with the total content(experimental value)of carboxylate and aldehyde groups of CNFs prepared by the TEMPO-mediated oxidation and the multi-site regioselective oxidation ***,the model was not valid for CNFs prepared by the periodate oxidation method.