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Hydrophobic Modification of Cellulose Nanofibrils and Their Application in Paper
Received:December 20, 2023  
DOI：10.11980/j.issn.0254-508X.2024.07.019
Key Words:cellulose nanofibrils  plant polyphenols  surface modification  hydrophobicity
Fund Project:国家自然科学基金（22378367）；浙江省“领雁”研发攻关计划项目（2023C03157）；衢州市科技计划项目（2023Z002）。
Author NameAffiliationPostcode
ZHOU Jiacheng Pulp and Papermaking Research Center， College of Textile Science and Engineering， Zhejiang Sci-Tech University， Hangzhou，Zhejiang Province， 310018 310018
ZOU Xiaofeng Zhejiang Huafeng Paper Group Co.， Ltd.， Anji， Zhejiang Province， 313309 313309
YANG Xiangjian Pulp and Papermaking Research Center， College of Textile Science and Engineering， Zhejiang Sci-Tech University， Hangzhou，Zhejiang Province， 310018
Zhejiang Huafeng Paper Group Co.， Ltd.， Anji， Zhejiang Province， 313309 		313309
CHEN Tianying Pulp and Papermaking Research Center， College of Textile Science and Engineering， Zhejiang Sci-Tech University， Hangzhou，Zhejiang Province， 310018 310018
TANG Yanjun* Pulp and Papermaking Research Center， College of Textile Science and Engineering， Zhejiang Sci-Tech University， Hangzhou，Zhejiang Province， 310018 310018
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Abstract:In this study， the hydrophobic modification of cellulose manofibrils （CNFs） was achieved based on an effective one-pot two-step method. The effects of five different plant polyphenols including gallic acid （GA）， methyl gallate （MG）， ethyl gallate （EG）， propyl gallate （PG）， and protocatechuic acid （PCA） on the hydrophobic properties of CNFs were emphatically investigated. Subsequently， the application of modified CNFs in paper coating was discussed. The results showed that the chosen plant polyphenols （GA， MG， EG， PG and PCA） could work together with octadecamine （ODA） to achieve the hydrophobic modification of CNFs. Moreover， the hydrophobic modification effect of CNFs was enhanced with the growth of carbon chains in the plant polyphenol’s structure. The hydrophobic modified CNFs could impart paper with improved hydrophobicity. The hydrophobicity of CNFs coated paper modified through PCA was better than that of CNFs coated paper modified through GA. After coating through PG modified CNFs， the water contact angle of the CNFs coated paper was 43% higher than that of the ODA coated paper. Moreover， the hydrophobic modified CNFs coated paper could maintain desired tensile strength under dry and wet conditions.
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