Preparation and characterization of TEMPO-oxidized cellulose nanofibril films with free carboxyl groups

被引:358
作者
Fujisawa, Shuji [1 ]
Okita, Yusuke [1 ]
Fukuzumi, Hayaka [1 ]
Saito, Tsuguyuki [1 ]
Isogai, Akira [1 ]
机构
[1] Univ Tokyo, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan
基金
日本学术振兴会;
关键词
TEMPO; TEMPO-oxidized cellulose nanofibril; Free carboxyl; Oxygen permeability; Film properties; MEDIATED OXIDATION; NATIVE CELLULOSE; MICROFIBRILLATED CELLULOSE; SURFACE; ACID; MONOLAYERS; POLYSACCHARIDES; DEPOSITION; WATER; GOLD;
D O I
10.1016/j.carbpol.2010.12.029
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
A 2,2,6,6-tetramehylpiperidine-1-oxy radical (TEMPO)-oxidized wood cellulose with sodium carboxylate groups was completely converted to individual TEMPO-oxidized cellulose nanofibrils with free carboxyl groups (TOCN-COOH) dispersed in water at pH 4.6. Self-standing films prepared by casting and drying of the TOCN-COOH/water dispersion were flexible and highly transparent. Fourier transform infrared (FT-IR) spectra and sodium content determination confirmed that the sodium carboxylate groups of TOCN-COONa were almost completely converted to free carboxyl groups in TOCN-COOH. The TOCN-COOH and TOCN-COONa films had similar densities and tensile strengths, but the former had lower moisture content, higher Young's modulus and lower elongation values than those of the latter. The oxygen permeability of the TOCN-COOH films was 0.049 mL mu m m(-2) day(-1) kPa(-1), which was clearly lower than that (15.5 mL mu m m(-2) day(-1) kPa(-1)) of poly(ethylene terephthalate) films. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:579 / 583
页数:5
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