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Study on Preparation of Lignin-containing Cellulose Nanofibril with Acidic Deep Eutectic Solvents and Its Composite Film
Received:August 07, 2022  
DOI：DOI：10.11980/j.issn.0254-508X.2023.03.006
Key Words:deep eutectic solvent  pretreatment  lignin-containing cellulose nanofibril  polyvinyl alcohol
Fund Project:国家自然科学基金项目（32071715）。
Author NameAffiliationPostcode
LI Zhan* School of Light Industry Science and Engineering， Tianjin University of Science & Technology， Tianjin， 300457
State Key Lab of Biobased Fiber Manufacturing Technology， Tianjin University of Science & Technology， Tianjin， 300457 		300457
JIANG Chuang School of Light Industry Science and Engineering， Tianjin University of Science & Technology， Tianjin， 300457
State Key Lab of Biobased Fiber Manufacturing Technology， Tianjin University of Science & Technology， Tianjin， 300457 		300457
NING Chenxi School of Light Industry Science and Engineering， Tianjin University of Science & Technology， Tianjin， 300457
State Key Lab of Biobased Fiber Manufacturing Technology， Tianjin University of Science & Technology， Tianjin， 300457 		300457
REN Qian School of Light Industry Science and Engineering， Tianjin University of Science & Technology， Tianjin， 300457
State Key Lab of Biobased Fiber Manufacturing Technology， Tianjin University of Science & Technology， Tianjin， 300457 		300457
HOU Qingxi School of Light Industry Science and Engineering， Tianjin University of Science & Technology， Tianjin， 300457
State Key Lab of Biobased Fiber Manufacturing Technology， Tianjin University of Science & Technology， Tianjin， 300457 		300457
LIU Wei School of Light Industry Science and Engineering， Tianjin University of Science & Technology， Tianjin， 300457
State Key Lab of Biobased Fiber Manufacturing Technology， Tianjin University of Science & Technology， Tianjin， 300457 		300457
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Abstract:Lignin-containing cellulose nanofibril （LCNF） was prepared by acidic deep eutectic solvent （DES） pretreatment combined with high pressure homogenization， and was co-blended with polyvinyl alcohol （PVA） to form LCNF/PVA composite film. The effects of two acidic DES pretreatments were investigated， the properties of LCNF were compared and analyzed， the performance of the LCNF/PVA composite film was discussed. The results showed that the extractions of hemicellulose by lactic acid-choline chloride （LC） and acetic acid-choline chloride （AC） both were more than 78%， and the lignin extraction was as high as 61.2% after LC pretreatment with ethanol washing. After DES pretreatment， ethanol washing was beneficial to separation of lignin. The diameter of cellulose nanofilament prepared by LC （LC-E-LCNF） was 50~100 nm. Compared with pure PVA film， the hydrophobicity of LCNF/PVA composite film was significantly improved， and its stress was raised to 70.3 MPa， and its UV blocking ability was approximately 100%. It had good thermal stability and haze， as well as certain freshness preservation performance， which was expected to be used in the food packaging field.
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