title: Acylation of cellulose nanocrystals with acids/trifluoroacetic anhydride and properties of films from esters of CNCs.
abstract: To eliminate the effect of humidity on nanopapers from nanocellulose, esters of CNCs (ECNCs) were synthesized via acylation of cellulose nanocrystals (CNCs) with fatty acids and Trifluoroacetic anhydride (TFAA). The structure information of ECNCs was confirmed via FTIR, degree of substitution (DS) determination, and XRD, respectively. With the increase of DS, the ECNCs could be dissolved in dichloromethane, which provided a ready way for fabrication of ECNCs films via casting/evaporation method. The tensile property, transmittance, hydrophobicity, thermal property and oxygen permeability of films were tested with universal tensile tester, UV-vis spectrophotometer, Contact angle tester, Simultaneous thermal analyzer and Oxygen permeability tester, respectively. With the increase of DS, the contact angles of ECNCs increased, and the water uptake decreased. The enhancement of hydrophobicity promised the preservation of tensile parameters for films after water absorbing. The hydrophobicity, high transmittance, and high oxygen barrier property make films have potential application in packaging filed.
authors.affiliation: Liaoning Provincial Key Laboratory of Functional Textile Materials, Eastern Liaoning University, Dandong, 118003 Liaoning, China; School of Chemical Engineering, Eastern Liaoning University, Dandong, 118003 Liaoning, China.
authors.forename: Fengyuan
authors.initials: F
authors.lastname: Huang
authors.affiliation: School of Chemical Engineering, Eastern Liaoning University, Dandong, 118003 Liaoning, China.
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Wu
authors.affiliation: School of Chemical Engineering, Eastern Liaoning University, Dandong, 118003 Liaoning, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Liaoning Provincial Key Laboratory of Functional Textile Materials, Eastern Liaoning University, Dandong, 118003 Liaoning, China; School of Chemical Engineering, Eastern Liaoning University, Dandong, 118003 Liaoning, China. Electronic address: yanhualu@aliyun.com.
authors.forename: Yanhua
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Liaoning Provincial Key Laboratory of Functional Textile Materials, Eastern Liaoning University, Dandong, 118003 Liaoning, China; School of Chemical Engineering, Eastern Liaoning University, Dandong, 118003 Liaoning, China. Electronic address: qifan_c405@163.com.
authors.forename: Qifan
authors.initials: Q
authors.lastname: Chen
keywords: Barrier properties; Cellulose nanocrystals (CNCs); Esters of CNCs (ECNCs); Long chain fatty acids; Tensile property; Transmittance