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Transparent, Flexible, and Strong 2,3-Dialdehyde Cellulose Films with High Oxygen Barrier Properties.
Biomacromolecules ( IF 6.2 ) Pub Date : 2018-05-22 , DOI: 10.1021/acs.biomac.8b00536
Sven F Plappert , Sakeena Quraishi , Nicole Pircher , Kirsi S Mikkonen 1 , Stefan Veigel , Karl Michael Klinger , Antje Potthast , Thomas Rosenau , Falk W Liebner
Affiliation  

2,3-Dialdehyde cellulose (DAC) of a high degree of oxidation (92% relative to AGU units) prepared by oxidation of microcrystalline cellulose with sodium periodate (48 °C, 19 h) is soluble in hot water. Solution casting, slow air drying, hot pressing, and reinforcement by cellulose nanocrystals afforded films (∼100 μm thickness) that feature intriguing properties: they have very smooth surfaces (SEM), are highly flexible, and have good light transmittance for both the visible and near-infrared range (89-91%), high tensile strength (81-122 MPa), and modulus of elasticity (3.4-4.0 GPa) depending on hydration state and respective water content. The extraordinarily low oxygen permeation of <0.005 cm3 μm m-2 day-1 kPa-1 (50% RH) and <0.03 cm3 μm m-2 day-1 kPa-1 (80% RH) can be regarded as a particularly interesting feature of DAC films. The unusually high initial contact angle of about 67° revealed a rather low hydrophilicity compared to other oxidatively modified or unmodified cellulosic materials which is most likely the result of inter- and intramolecular hemiacetal and hemialdal formation during drying and pressing.

中文翻译:

具有高氧气阻隔性能的透明,柔性和坚固的2,3-二醛纤维素膜。

通过微晶纤维素与高碘酸钠(48°C,19 h)氧化制备的高氧化度的2,3-二醛纤维素(DAC)(相对于AGU单位为92%)可溶于热水。固溶流延,慢速空气干燥,热压和纤维素纳米晶体的增强提供了具有吸引人的特性的膜(约100μm厚度):它们具有非常光滑的表面(SEM),高度柔韧性和对可见光均具有良好的透光率取决于水合状态和各自的水分含量,其近红外范围(89-91%),高抗张强度(81-122 MPa)和弹性模量(3.4-4.0 GPa)。<0.005 cm3μmm-2 day-1 kPa-1(50%RH)和<0.03 cm3μmm-2 day-1 kPa-1(80%RH)的极低的氧气渗透被认为是特别有趣的DAC胶片的功能。
更新日期:2018-05-14
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