Water-resistant hybrid cellulose nanofibril films prepared by charge reversal on gibbsite nanoclays.
Carbohydr Polym
; 295: 119867, 2022 Nov 01.
Article
em En
| MEDLINE
| ID: mdl-35989010
ABSTRACT
A novel method is reported for the preparation of a hybrid gibbsite-cellulose nanofibril (CNF) nanocomposite film with improved wet and dry mechanical properties and barrier properties. A gibbsite and cationic CNF dispersion was dewatered at pH 7 to prepare well-ordered films. Thereafter, the charge on gibbsite was reversed by dipping the film in pH 12 water to induce an ionic interaction between CNFs and gibbsite, enhancing the film properties; modulus improved from 9 GPa to 12 GPa, with a maintained strain-at-break of 6 % and tensile strength of 190 MPa. Additionally, the charge-reversed film swelled a factor of 24 less than a film without any gibbsite. At 23 °C and 80 % RH, the oxygen barrier properties were improved by a factor of 28, to a value of 18 ml·µm·m-2·kPa-1·24 h-1 and the water vapour barrier properties were improved by a factor of 12, to a value of 105 g·µm·m-2·kPa-1·24 h-1.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Nanocompostos
/
Nanofibras
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article