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Preparation and Characterization of Sulfonated Cellulose Nanofibril Based on Deep Eutectic Solvent
Received:June 12, 2021  
DOI：10.11980/j.issn.0254-508X.2021.11.001
Key Words:deep eutectic solvent  cellulose nanofibril  sulfation  swelling
Fund Project:国家自然科学基金（31901267）；山东省重点研发计划（2019JZZY010326，2019JZZY010328）；山东省自然科学基金（ZR2019BC042）；山东省科教产融合创新试点工程（2020KJC-ZD14）。
Author NameAffiliationPostcode
LI Weidong State Key Lab of Bio-based 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， Shandong Province， 250353 250353
HE Ming* State Key Lab of Bio-based 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， Shandong Province， 250353 250353
CHEN Jiachuan State Key Lab of Bio-based 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， Shandong Province， 250353 250353
ZHANG Zhiguo State Key Lab of Bio-based 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， Shandong Province， 250353 250353
YANG Guihua State Key Lab of Bio-based 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， Shandong Province， 250353 250353
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Abstract:In this study， bleached chemical poplar pulp was used as raw material to prepare sulfonated cellulose nanofibril （CNF） using sulfamic acid and deep eutectic solvent （DES） pretreatment combined with superfine grinding. The effects of treatment time （1.0， 1.5 h） and molar ratio of sulfamic acid to cellulose （20 ∶ 1， 15 ∶ 1， 10 ∶ 1） on pulp fiber and CNF were investigated. The fiber quality analyzer， element analyzer， and infrared spectrometer were used to analyze and characterize the structure of pulp fiber before and after DES pretreatment. The results showed that compared with the pulp， fiber length of the pulp pretreated by DES was reduced with the maximum reduction of 72.67% while the diameter of which increased with the maximum increasement of 26.82%. With extension of the treatment time and increase of sulfamic acid amount， the length of the pulp fiber decreased， while the diameter， sulfur content， and degree of substitution （DS， to 0.17） of the pulp fiber pretreated with DES increased. The analysis of the prepared sulfonated CNF by particle size analyzer， atomic force microscope， Zeta potential detector， X-ray diffractometer， and multiple light scattering analyzer showed that after DES pretreatment， the average particle size of the sulfonated CNF decreased with the minimum value of 40.02 nm， the Zeta potential of sulfonated CNF colloid was between -43.50~ -18.80 mV， the crystallinity reduced with the minimum value of 58.51%， while the stability of the sulfonated CNF suspension improved.
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