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Application of Cryoprotectant in Cellulose Nanofibers Aerogels
  
DOI：10.11980/j.issn.0254-508X.2018.04.001
Key Words:cellulose nanofibers  aerogels  cryoprotectant  sorbitol  sucrose  mannitol
Fund Project:国家重点研发计划重点专项(No.2017YFB0307901)；广西清洁化制浆造纸与污染控制重点实验室开放基金(No. KF201716)；天津科技大学青年教师创新基金(No.2017LG06)。
Author NameAffiliation
HOU Jia-ling 1 1.Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 
LIU Peng-tao1，2,* 1.Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457；2.Guangxi Key Lab of Clean Pulp & Papermaking and Pollution Control， Nanning，Guangxi Zhuang Autonomous Region， 530004 
HUI Lan-feng 1 1.Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 
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Abstract:Bleached softwood kraft pulp was used as the raw material for the preparation of cellulose nanofibers （CNF） by TEMPO-mediated oxidation method， and CNF was converted to the low density， high-specific surface and high-strength aerogels after freeze-drying. But the CNF aerogels has low strength and non-uniform pore size. In order to improve the strength of aerogels， different kinds of cryoprotectants including sorbitol， sucrose and mannitol were added to the CNF suspension to reduce the pore structure and create uniform distribution of the pore size. The structures and properties of CNF aerogels were characterized by TEM， SEM， BET， XRD， FT-IR and TGA. The results showed that the CNF had homogeneous size and its diameter was 10～20 nm， and the pore size distribution of aerogels tended to be uniform after cryoprotectant was added. Additionally， the mechanical strength of CNF aerogels was greatly improved by the addition of cryoprotectant， and it would not affect the crystal structure and thermal stability of aerogels.
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