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Investigation on the Dispersion Properties of Carboxylated Cellulose Nanofibrils for Monolayer Montmorillonite
Received:February 18, 2024  
DOI：10.11980/j.issn.0254-508X.2024.07.011
Key Words:cellulose nanofibril  montmorillonite  dispersion stability  carboxylation
Fund Project:国家自然科学基金项目（U23A6005，21978103）；广东省基础与应用基础研究基金（2023B1515040013，2020B1515020021）；制浆造纸工程国家重点实验室（2023C05，2022C01）。
Author NameAffiliationPostcode
PENG Liyuan State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
FANG Zhiqiang* State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
LI Guanhui State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
LIN Xiaoqi State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
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Abstract:In this study， colloidally stable monolayer montmorillonite （MMT） dispersions were prepared using cellulose nanofibrils （CNF） as dispersant， and the effects of carboxyl content and aspect ratio of CNF on the dispersion stability， average particle size， viscosity， and yield of monolayer MMT dispersions were explored. The results showed that 2,2,6,6-tetramethylpiperidine nitride oxide （TEMPO） oxidized CNF （TOCNF） was more effective than carboxymethylated CNF （CMCNF） in dispersing monolayer MMT dispersions. Specifically， TOCNF with a carboxyl content of 1.24 mmol/g presented the best dispersion capability and the as-prepared monolayer MMT had an average particle size of 317 nm. Additionally， when the concentration of TOCNF （1.24 mmol/g） dispersion was 0.1%， the maximum initial concentration of the dispersed MMT was 1.5%， the yield and concentration of the monolayer MMT after ultrasonication and centrifugation were 52% and 0.78%， respectively.
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