Journal
BIOMACROMOLECULES
Volume 12, Issue 11, Pages 4057-4062Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bm201079n
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Funding
- New Energy and Industrial Technology Development Organization of Japan (NEDO) [1023001]
- Japan Society for the Promotion of Science (JSPS) [21228007, 21-6112]
- Grants-in-Aid for Scientific Research [09J06112, 21228007, 23688020] Funding Source: KAKEN
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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 mu m 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 run 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 mu m m(-2) day(-1) kPa(-1) at 50% RH, which is one of the shortcomings of hydrophilic TOCN-COONa films.
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