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Effect of Drying Methods on Redispersion Properties of Cellulose Nanofibril Pretreated with Sodium Chloride
Received:May 12, 2020  
DOI：10.11980/j.issn.0254-508X.2020.10.001
Key Words:cellulose nanofibril  vacuum drying  freeze drying  redispersion
Fund Project:国家自然科学基金(31770628，31901267)；山东省重点研发计划(2019JZZY010326，2019JZZY010328)；山东省自然科学基金(ZR2019BC042)；泰山学者工程。
Author NameAffiliationPostcode
MA Guangrui （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， Shangdong 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， Shangdong 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， Shangdong Province， 250353） 250353
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， Shangdong Province， 250353） 250353
JI Xingxiang （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， Shangdong 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， Shangdong Province， 250353） 250353
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Abstract:In this study， sodium chloride， a hydrogen bond blocker， was used to pretreat cellulose nanofibril （CNF） before drying. The effects of vacuum drying and freeze drying on the redispersibility of CNF were discussed. The properties of CNF were analyzed and characterized by scanning electron microscope， X-ray diffraction， multiple light scattering analyzer and rheometer.The results showed that vacuum drying （55℃） could promote hydrogen bond blocking of sodium chloride （NaCl）. After NaCl pretreatment， the crystallinity of CNF obtained by vacuum drying was 64.7%， which was 2 percentage points lower than that of CNF obtained by freeze drying （-84℃） （66.7%）. The redispersibility of vacuum dried CNF aqueous suspension was higher. The stability index of redispersed CNF after vacuum drying ranged from 0 to 0.45， which was smaller than the range stability index （0 to 4.5） of CNF after freeze drying. Pretreatment with sodium chloride was beneficial to improve the stability of redispersed CNF suspension. The apparent viscosity of vacuum-dried CNF with sodium chloride pretreatment was obviously lower than that of freeze-dried CNF.
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