UV‐cured cellulose nanofiber composites with moisture durable oxygen barrier properties

Abstract

Nanocomposites based on 10 to 60 vol % cellulose nanofibers (NFC) in a photopolymerizable hyperbranched acrylate matrix were prepared. Unmodified NFC and NFC chemically modified with a silane coupling agent and with ceric ammonium nitrate for direct polymer grafting from the cellulose surface were used. A homogeneous dispersion of NFC in the matrix was obtained in each case, leading to a marked improvement in oxygen barrier (up to nine times) and thermomechanical properties (storage modulus increased up to seven times). The mechanisms involved in the permeability reduction were investigated, revealing non‐monotonic trends in the evolution of the solubility and diffusion coefficients with NFC content. Most significantly, the inherent moisture sensitivity of the oxygen permeability of the NFC was found to be drastically reduced when it was dispersed in the polymer matrix, particularly after chemical modification, underlining the promise of the present approach for the production of robust, high barrier organic films. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40604.

Water-resistant and high oxygen-barrier nanocellulose films with interfibrillar cross-linkages formed through multivalent metal ions

“…However, the TOCN-COOCa and TOCN-COOAl films had extremely low P-O 2 values of 0.08 and 0.15 mL µm m -2 day -1 kPa -1 , respectively, even at 80% RH. These values were significantly lower than those of previously reported nanocellulose films [10,[35][36][37][38][39] carboxyl groups in the TOCN-COOFe films may have caused the high P-O 2 value at 80% RH (Table 1). Moreover, it may be possible that magnesium, iron and aluminum carboxylate groups in the corresponding TOCN-COOM films contained some hydrated structures, which may influence the P-O 2 values under high RH conditions.…”

Photocuring of Epoxidized Cardanol for Biobased Composites with Microfibrillated Cellulose

“…Therefore, MFC has been combined with crosslinked polymer matrices. A solvent exchange process has been reported for the fabrication of composites with microfibrillated cellulose to preserve a structure of individual nanofibers; composites with a thermally cured epoxy matrix, and UV curable composites with an acrylate matrix have been prepared [16,17]. To the best of our knowledge no reports are available at the moment on composites of microfibrillated cellulose with a biobased cardanol epoxy photocrosslinked matrix.…”

Extraction and modification of cellulose nanofibers derived from biomass for environmental application

“…The sowood pulp was subjected to enzymatic degradation, mechanical beating and disintegration by passing through microuidizer to obtain CNF of 6.6 nm diameter and more than 700 nm length. Galland et al 75 prepared hollo CNF of high molar mass and small diameter that can be used for preparing high strength nanopapers. Aspen wood chips were chemically treated using chelating agents like diethylene triaminepentaacetic acid (DTPA)/sodium sulte solution to remove metal ions.…”