Pore Size Determination of TEMPO-Oxidized Cellulose Nanofibril Films by Positron Annihilation Lifetime Spectroscopy

Wood cellulose nanofibril films with sodium carboxylate groups prepared from a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized pulp exhibited an extremely low oxygen permeability of 0.0008 mL μm m–2 day–1 kPa–1 at 0% relative humidity (RH). Positron annihilation lifetime spectroscopy (PALS) wa...

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Bibliographic Details
Published in:Biomacromolecules 2011-11, Vol.12 (11), p.4057-4062
Main Authors: Fukuzumi, Hayaka, Saito, Tsuguyuki, Iwamoto, Shinichiro, Kumamoto, Yoshiaki, Ohdaira, Toshiyuki, Suzuki, Ryoichi, Isogai, Akira
Format: Article
Language:English
Subjects:
Applied sciences
Cellulose - chemistry
Cellulose and derivatives
Cyclic N-Oxides - chemistry
Exact sciences and technology
Microscopy, Atomic Force
Nanofibers - chemistry
Natural polymers
Oxidants - chemistry
Oxidation-Reduction
Oxygen - chemistry
Permeability
Physicochemistry of polymers
Porosity
Spectrum Analysis
Surface Properties
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Summary:Wood cellulose nanofibril films with sodium carboxylate groups prepared from a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized pulp exhibited an extremely low oxygen permeability of 0.0008 mL μm m–2 day–1 kPa–1 at 0% relative humidity (RH). Positron annihilation lifetime spectroscopy (PALS) was used to determine the pore sizes in wood and tunicate TEMPO-oxidized cellulose nanofibril (TOCN-COONa) films in a vacuum (i.e., at 0% RH). PALS analysis revealed that the pore size of the wood TOCN-COONa films remained nearly at 0.47 nm from the film surface to the interior of the film. This is probably the cause of this high oxygen-barrier properties at 0% RH. The crystalline structure of TOCN-COONa also contributes to the high oxygen-barrier properties of the wood TOCN-COONa films. However, the oxygen permeability of the wood TOCN-COONa films increased to 0.17 mL μm m–2 day–1 kPa–1 at 50% RH, which is one of the shortcomings of hydrophilic TOCN-COONa films.
ISSN:1525-7797
1526-4602
DOI:10.1021/bm201079n