Preparation and characterization of TEMPO-oxidized cellulose nanofibril films with free carboxyl groups
Preparation and characterization of TEMPO-oxidized cellulose nanofibril films with free carboxyl groups
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DOI：
10.1016/j.carbpol.2010.12.029
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发表时间：
2011-02-11
影响因子：
11.2
通讯作者：
Isogai, Akira
中科院分区：
文献类型：
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作者：
Fujisawa, Shuji;Okita, Yusuke;Isogai, Akira
具有羧酸钠基团的2，2，6，6-四甲基哌啶-1-氧自由基（克里思）氧化的木材纤维素完全转化为分散在pH 4.6的水中的具有游离羧基的单个TEMPO氧化纤维素纳米原纤维（TOCN-COOH）。通过流延和干燥TOCN-COOH/水分散体制备的自支撑膜是柔性的和高度透明的。傅里叶变换红外光谱（FT-IR）和钠含量测定证实了TOCN-COONa中的羧酸钠基团几乎完全转化为TOCN-COOH中的游离羧基。TOCN-COOH和TOCN-COONa膜的密度和拉伸强度相似，但前者的含水量较低，杨氏模量较高，伸长率较低。TOCN-COOH膜的透氧率为0.049 mL μ m m（-2）day（-1）kPa（-1），明显低于聚对苯二甲酸乙二醇酯膜的透氧率（15.5 mL μ m m（-2）day（-1）kPa（-1））。(C)2010爱思唯尔有限公司版权所有。
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.