Transparent and High Gas Barrier Films of Cellulose Nanofibers Prepared by TEMPO-Mediated Oxidation
Transparent and High Gas Barrier Films of Cellulose Nanofibers Prepared by TEMPO-Mediated Oxidation
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DOI：
10.1021/bm801065u
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发表时间：
2009-01-01
影响因子：
6.2
通讯作者：
Isogai, Akira
中科院分区：
文献类型：
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作者：
Fukuzumi, Hayaka;Saito, Tsuguyuki;Isogai, Akira
研究了2,2,6,6-四甲基哌替啶-1-氧自由基（TEMPO）对软木材和硬木纤维素的氧化作用。tempo氧化纤维素纤维在水中转化为透明分散体，由单个纳米纤维组成，宽度为3-4 nm。然后用tempo氧化纤维素纳米纤维（TOCN）制备薄膜，并从各个方面对其进行了表征。AFM图像显示，TOCN膜表面由随机组合的纤维素纳米纤维组成。软木纤维素制备的TOCN薄膜透明柔韧，由于TOCN的高结晶度，其热膨胀系数极低。此外，通过在聚乳酸（PLA）薄膜上形成薄的TOCN层，聚乳酸（PLA）薄膜的透氧性急剧降低至约1/750。原本亲水的TOCN薄膜通过烷基烯二聚体处理实现疏水。TOCN薄膜的这些独特特性在一些高科技材料中具有潜在的应用前景。
Softwood and hardwood celluloses were oxidized by 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)mediated oxidation. The TEMPO-oxidized cellulose fibers were converted to transparent dispersions in water, which consisted of individual nanofibers 3-4 nm in width. Films were then prepared from the TEMPO-oxidized cellulose nanofibers (TOCN) and characterized from various aspects. AFM images showed that the TOCN film surface consisted of randomly assembled cellulose nanofibers. The TOCN films prepared from softwood cellulose were transparent and flexible and had extremely low coefficients of thermal expansion caused by high crystallinity of TOCN. Moreover, oxygen permeability of a polylactic acid (PLA) film drastically decreased to about 1/750 by forming a thin TOCN layer on the PLA film. Hydrophobization of the originally hydrophilic TOCN films was achieved by treatment with alkylketene dimer. These unique characteristics of the TOCN films are promising for potential applications in some high-tech materials.